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Wyświetlanie 1-15 z 42
Tytuł:
Crystalline Structure of Potassium Holmium Double Tungstate
Autorzy:
Borowiec, M.
Dyakonov, V.
Woźniak, K.
Dobrzycki, Ł.
Majchrowski, A.
Michalski, E.
Zubov, E.
Khatsko, E.
Zayarnyuk, T.
Szewczyk, A.
Gutowska, M.
Rykova, A.
Barański, M.
Domukhovski, V.
Shtyrkhunova, V.
Iwanowski, P.
Żmija, J.
Szymczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/1505085.pdf
Data publikacji:
2011-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
Opis:
The potassium holmium double tungstate was prepared by using top seeded solution growth technique. Structural investigations have been performed at room temperature. The $KHo(WO_4)_2$ single crystal belongs to the monoclinic space group C2/c with the unit-cell parameters: a = 10.624(2) Å, b = 10.352(2) Å, c = 7.5434(15) Å, β = $130.78(3)^{o}$, and Z = 4. The atomic coordinates, isotropic and anisotropic displacement parameters and interionic distances for the studied structure were determined.
Źródło:
Acta Physica Polonica A; 2011, 119, 6; 835-837
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Route to Prepare Magnetic Material $Co_3V_2O_8$ and Structural Characterization
Autorzy:
Celik, G.
Kurtulus, F.
Guler, H.
Powiązania:
https://bibliotekanauki.pl/articles/1491310.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.-m
32.30.Rj
33.20.Ea
61.43.Gt
61.66.Fn
65.40.-b
75.47.Lx
81.40.Gh
82.33.Pt
84.40.-x
Opis:
$Co_3V_2O_8$ is a member of kagomé staircase oxides, represented by general formula $M_3V_2O_8$ (M = Ni, Co, Mn). It attracted great attention due to strong magnetic anisotropy, magnetic phase transition, genuine macroscopic quantum effects, strong quantum fluctuations, low-temperature ferroelectricity, field-induced magnetic transitions, complicated phase diagram and displays long-range magnetic order because of geometrical frustration. Different routes to prepare the frustrated magnetic material was reported such as floating zone technique and conventional high temperature method. $Co_3V_2O_8$ (International Centre for Diffraction Data (ICDD): 16-675) was synthesized with $Co_3O_4$ (ICDD: 80-1536) as binary phase by microwave assisted preparation using $Co(NO_3)_2 ·6H_2O$ and $NH_4VO_3$. The synthesized material was characterization by powder X-ray diffraction, the Fourier transform infrared spectroscopy, and thermogravimetric-differential thermal analysis.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 203-204
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Promising Synthetic Route Hydrothermal Synthesis of Non-Stoichiometric Cerium and Boron Containing Compounds and Characterization
Autorzy:
Çelik, G.
Kurtuluş, F.
Powiązania:
https://bibliotekanauki.pl/articles/1181838.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.33.Pt
61.66.Fn
61.05.cp
Opis:
Cerium, the most abundant rare earth element, and boron containing mineral (lithium tetraborate pentahydrate) were used for synthesizing rare earth borates. Alternatively, for preparing rare earth borates, hydrothermal technique can be used. The non-stoichiometric cerium and boron containing compounds were synthesized by hydrothermal method using cerium sulphate and lithium tetraborate pentahydrate in appropriate molar ratio. Characterizations were done by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy/energy dispersive X-ray analysis, and thermogravimetric/differential thermal analysis.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 325-326
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure Refinement of the Semiconducting Compound $Cu_3TaS_4$ from X-Ray Powder Diffraction Data
Autorzy:
Delgado, G.
Contreras, J.
Mora, A.
Durán, S.
Muñoz, M.
Grima-Gallardo, P.
Powiązania:
https://bibliotekanauki.pl/articles/1493612.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Nw
61.66.Fn
Opis:
The ternary compound $Cu_{3}TaS_{4}$ has been investigated by means of X-ray powder diffraction and its structure has been refined by the Rietveld method. This compound is isostructural with the sulvanite mineral $Cu_{3}VS_{4}$, and crystallizes in the cubic $P \bar{4} 3m$ space group (No. 215), Z = 1, with unit cell parameters a = 5.5145(1) Å and V = 167.70(1) $Å^{3}$. The refinement of 14 instrumental and structural parameters converged to $R_{p}$ = 4.4%, $R_{wp}$ = 6.8%, $R_{exp}$ = 5.5% and S = 1.2 for 4501 step intensities and 33 independent reflections.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 468-472
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Secondary Interactions and Structure-Activity-Relationship of Two Benzoic Acids
Autorzy:
Dinesh, J.
Powiązania:
https://bibliotekanauki.pl/articles/1400141.pdf
Data publikacji:
2013-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
Opis:
Two benzoic acids, 2-[3-(o-methylphenoxymethyl)-5-phenyl-[1,2,4]triazol-4-yl]-benzoic acid [I] and 2-[3-(m-methylphenoxymethyl)-5-phenyl-[1,2,4]triazol-4-yl]-benzoic acid [II] were synthesized and their crystal structures have been analyzed to the reliability factor of 4.2% [I] and 4.8% [II]. Different structural motifs (i.e. chains, dimmers, rings, etc.) bonded through C-H...π, ı...ı and hydrogen interactions have been analyzed. Structure-activity-predictions have been identified on the basis of structural fragments and variation in activities has been observed in both the compounds. The detailed analysis of non-covalent interactions illustrates that the shifting of methyl group from ortho-to-para increases the bioactivity-predictions of "Endothelin B receptor antagonist".
Źródło:
Acta Physica Polonica A; 2013, 123, 4; 704-708
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and Theoretical Study of Zircon and Scheelite Phases of $DyVO_4$
Autorzy:
Ermakova, O.
Paszkowicz, W.
López-Solano, J.
Muñoz, A.
Dabkowska, H.
Powiązania:
https://bibliotekanauki.pl/articles/1431671.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
61.43.Bn
61.66.Fn
Opis:
Polycrystalline zircon-type dysprosium orthovanadate, $DyVO_4,$ prepared from a single crystal grown by slow cooling from $PbO//PbF_2$ flux, was studied by X-ray diffraction. Rietveld refinement provided the following unit cell size and oxygen atom coordinates: a=7.14811(4) Å; c=6.30825(4) Å, V=322.323(3) Å3, y($O^{2-}$)=0.4300(4); z($O^{2-}$)=0.2082(4) which are of a particularly high accuracy and show consistency with earlier reported values. Density functional theory calculations within the generalized gradient approximation for the exchange-correlation energy were also performed, providing values of structure parameters which differ by less than 2% from the experimental ones. The agreement between theory and experiment demonstrates the value of these calculations for understanding the structure of compounds of $RVO_4$ family. In addition, density functional theory calculations were performed for the scheelite-type $DyVO_4$; also for this polymorph the discrepancy with the only known set of lattice parameters is less than 2%. Values of oxygen atom coordinates have not been reported yet for this polymorph; here, the calculated ones are quoted.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 920-927
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Constitution of Paramagnetic 3d Complexes and Positronium Conversion Rate Constants
Autorzy:
Fantola Lazzarini, A. L.
Lallarini, E.
Powiązania:
https://bibliotekanauki.pl/articles/1929063.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.10.Dr
61.66.Fn
71.70.Ch
78.40.Dw
78.70.Bj
Opis:
The rate constants, k$\text{}_{SE}$, of ortho- into para-positronium spin conversion reactions promoted by paramagnetic 3d complexes may be correlated with their electronic constitution as it is described by the spin-orbit coupling and interelectronic repulsion parameters. The correlation is explained in terms of unpaired metal-electron delocalization towards the complex boundaries.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 297-302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Growth by LHPG, Structure and Spectroscopy of Nd$\text{}^{3+}$-Doped Ba$\text{}_{2}$NaNb$\text{}_{5}$O$\text{}_{15}$ Nonlinear Single-Crystal Fibres
Autorzy:
Foulon, G.
Ferriol, M.
Brenier, A.
Cohen-Adad, M. T.
Boulon, G.
Powiązania:
https://bibliotekanauki.pl/articles/1945469.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
78.20.-e
Opis:
The renewal of the second order nonlinear crystals is very strong in laser materials optics. We are involved in the search for new systems based upon highly nonlinear niobate crystal family. Among these crystals, Ba$\text{}_{2}$NaNb$\text{}_{5}$O$\text{}_{15}$ is characterized by the highest nonlinear parameters but, unfortunately, it is difficult to grow crackless samples. The obtention of good quality and crackless Ba$\text{}_{2}$NaNb$\text{}_{5}$O$\text{}_{15}$ single crystals doped with different concentrations of Nd$\text{}_{2}$O$\text{}_{3}$ is reported. The crystals were grown as monocrystalline fibres by the laser heated pedestal growth technique. A new determination of the crystallographic structure of Ba$\text{}_{2}$NaNb$\text{}_{5}$O$\text{}_{15}$ has been performed. The structure of fibres doped with 1 at.% Nd$\text{}^{3+}$ was found orthorhombic with the new space group Pba2 instead of Cmm2. The well-known twinning of Ba$\text{}_{2}$NaNb$\text{}_{5}$O$\text{}_{15}$ due to the exchange of the a and b axes of the unit cell, which disturbs the optical properties, decreases as the Nd$\text{}^{3+}$ content of the fibre increases. Above 3%Nd$\text{}^{3+}$ ions, such monocrystalline fibres were found to be of tetragonal structure. Low temperature spectroscopy reveals that Nd$\text{}^{3+}$ ions substitute probably both Ba$\text{}^{2+}$ and Na$\text{}^{+}$ ions. The stimulated emission cross-section near 1060 nm of the $\text{}^{4}$F $\text{}_{3}\text{}_{/}\text{}_{2}$ → $\text{}^{4}$I$\text{}_{11}\text{}_{/}\text{}_{2}$ channel and its branching ratios are determined with the help of Judd-Ofelt analysis. This work shows that b-axis grown monocrystalline fibres are potentially self-doubling laser materials.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 63-72
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Structure of K$\text{}_{3}$Na(SeO$\text{}_{4}$)$\text{}_{2}$ at 340 K
Autorzy:
Fukami, T.
Chen, R. H.
Powiązania:
https://bibliotekanauki.pl/articles/1993089.pdf
Data publikacji:
1998-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
64.60.Fr
Opis:
The crystal structure of tripotassium sodium diselenate, K$\text{}_{3}$Na(SeO$\text{}_{4}$)$\text{}_{2}$, at 340 K is studied by single-crystal X-ray diffraction. The space group symmetry (trigonal P3̅) and structure parameters are determined. It is found that there exists the difference of the direction and the magnitude of the atomic displacement at the two phase transitions of 346 K and 334 K.
Źródło:
Acta Physica Polonica A; 1998, 94, 5-6; 795-801
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Phase Transition and Crystal Structure for (ND$\text{}_{4}$)$\text{}_{4}$D$\text{}_{2}$(SeO$\text{}_{4}$)$\text{}_{3}$ at Low Temperature
Autorzy:
Fukami, T.
Chen, R. H.
Powiązania:
https://bibliotekanauki.pl/articles/2027434.pdf
Data publikacji:
2001-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
64.60.Fr
Opis:
Differential scanning calorimetry and X-ray diffraction measurements were performed on a deuterated tetraammonium dihydrogen triselenate (ND$\text{}_{4}$)$\text{}_{4}$D$\text{}_{2}$(SeO$\text{}_{4}$)$\text{}_{3}$ crystal at low temperatures. A structural phase transition is found at 182.0(3) K. The space group symmetry (triclinic P1) and the structure parameters are determined at 145 K in the low-temperature phase. The isotope effect for an asymmetric O-H-O hydrogen bond by the substitution of deuterium is discussed.
Źródło:
Acta Physica Polonica A; 2001, 100, 1; 53-65
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Study of (NH$\text{}_{4}$)$\text{}_{4}$H$\text{}_{2}$(SeO$\text{}_{4}$)$\text{}_{3}$ in the Low-Temperature Phase
Autorzy:
Fukami, T.
Higa, N.
Chen, R. H.
Powiązania:
https://bibliotekanauki.pl/articles/2013261.pdf
Data publikacji:
2000-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
64.60.Fr
Opis:
The crystal structure of tetraammonium dihydrogen triselenate, (NH$\text{}_{4}$)$\text{}_{4}$H$\text{}_{2}$(SeO$\text{}_{4}$)$\text{}_{3}$, in the low-temperature phase at 141 K is studied by X-ray diffraction. The space group symmetry (triclinic P1) and the structure parameters are determined. By the shift of the Se atom from the center of the SeO$\text{}_{4}$ tetrahedron, it is suggested that the (NH$\text{}_{4}$)$\text{}_{4}$H$\text{}_{2}$ (SeO$\text{}_{4}$)$\text{}_{3}$ crystal in the low-temperature phase is ferroelectric with the electric dipole moment along the c-axis. The rotation of the SeO$\text{}_{4}$ tetrahedron suggested by electron paramagnetic resonance measurements is discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 4; 663-670
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties and Structure of Ln(NCS)(Hmpa)$\text{}_{4}$-(SCN)$\text{}_{2}$- HgCl(SCN)
Autorzy:
Gałdecka, E.
Gałdecki, Z.
Amirkhanov, V.
Kern, K.
Legendziewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1945687.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.55.Hx
78.20.Dj
78.66.-w
61.66.Fn
Opis:
Praseodymium, neodymium and europium complexes of the formula Ln(NCS)(Hmpa)$\text{}_{4}$-(SCN)$\text{}_{2}$-HgCl(SCN) were synthesised from non-aqueous solutions. The structure of neodymium complexes was determined by X-ray diffraction. The crystals of the title compounds crystallise in the space group Cc, where lanthanide ions are coordinated to seven ligand groups: four of Hmpa molecules and three SCN¯ ions. The compounds were characterised by IR, luminescence, excitation and absorption spectra at 6, 77, and 298 K. Probabilities of electronic transitions for Pr$\text{}^{3+}$ ion were examined at 6 K and at room temperatures. Vibronic components were observed and analysed on the basis of IR and Raman data. Asymmetric arrangement of Ln ions was found from X-ray analysis and its influence on optical properties of active centre was discussed.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 469-476
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, Structure, and Magnetism of Heterobinuclear Complex GdCu(OTf)$\text{}_{3}$(bdmap)$\text{}_{2}$(H$\text{}_{2}$O)·THF
Autorzy:
Gao, Song
Borgmeier, O.
Lueken, H.
Powiązania:
https://bibliotekanauki.pl/articles/1945652.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.40.+d
61.66.Fn
Opis:
A new heterobinuclear Gd(III)-Cu(II) complex [GdCu] = GdCu(OTf)$\text{}_{3}$(bdmap)$\text{}_{2}$(H$\text{}_{2}$O). THF (OTf=SO$\text{}_{3}$CF$\text{}_{3}$) has been prepared by reaction of 1,3-bis(dimethylamino)-2-propanol (bdmapH) with Cu(OCH$\text{}_{3}$)$\text{}_{2}$ and lanthanide triflate salt Gd(OTf)$\text{}_{3}$ in a 2:1:1 ratio in THF. Its structure has been determined by single-crystal X-ray diffraction. [GdCu] crystallizes on an orthorhombic lattice, space group P2$\text{}_{1}$2$\text{}_{1}$2$\text{}_{1}$ with Z=4 and a=11.023(3) Å, b=17.555(15) Å, c=20.212(7) Å, V=3911(4) Å$\text{}^{3}$. For 2194 independent reflections with I > 1σ(I), full-matrix least squares refinement with anisotropic thermal parameters for Gd, Cu, S, and O converged to unweighted and weighted R factors of 0.074 and 0.085, respectively. Gd is coordinated by six O and two N. Cu is coordinated by two O and two N. Gd and Cu are bridged by two alkoxo O atoms with separation of 3.311(4) Å. The magnetic susceptibilities were measured over the temperature range 1.7-20 K at the field range 0.01-0.5 T. The data of [GdCu] at 0.05 T have been analyzed with the use of a Heisenberg spin Hamiltonian Ĥ=-2JŜ$\text{}_{Gd}$·Ŝ$\text{}_{Cu}$ giving g=2.046(2), J=-0.039(3) cm$\text{}^{-1}$. This shows that Gd-Cu spins are coupled very weakly in the antiferromagnetic manner, though the distance between Gd(III) and Cu(II) ions is rather short.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 393-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A System of B-C-N-O: Synthesis, Characterization and Determination of Unit Cell Parameters
Autorzy:
Gül, G.
Kurtuluş, F.
Powiązania:
https://bibliotekanauki.pl/articles/1033375.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Ea
61.66.-f
61.66.Fn
84.40.-x
Opis:
Boron-rich solids are good candidates to apply instead of diamond. Boron has a unique crystal structure and compounds of it are resistant to heat treatment. These structures have light density, high hardness, and chemically inertness. Also, boron compounds display thermal and electronic properties as a thermoelectric power at high temperatures. A boron, carbon, nitrogen, and oxygen containing compound was synthesized for the first time by classical microwave method using elemental amorphous boron, active carbon, and urea with 1:1:1 molar ratio. The compound is crystallized in monoclinic system with unit cell parameters a=12.9575 Å, b=9.3264 Å, c=9.6529 Å, β =113.277° which are calculated by POWD indexing program. The X-ray diffraction, POWD, the Fourier transform infrared, scanning electron microscopy/energy X-ray diffraction spectroscopy and thermogravimetric/different thermal analysis were achieved.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 36-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Structural Study of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) Magnetocaloric Compounds Prepared by Arc Melting
Autorzy:
Hawelek, L.
Wlodarczyk, P.
Zackiewicz, P.
Polak, M.
Kaminska, M.
Puźniak, R.
Radelytskyi, I.
Kolano-Burian, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402326.pdf
Data publikacji:
2015-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Sg
75.30.Kz
61.05.C-
61.66.Fn
Opis:
Recently, room temperature magnetocaloric materials increasingly attracted attention in the development of magnetic refrigerators. In this paper, an effect of P/Ge substitution on the magnetic phase transition in the series of $Mn_{1.15}Fe_{0.85}P_{1-x}Ge_{x}$ (0.25 < x < 0.32) magnetocaloric compounds prepared by the arc melting technique and subsequent homogenization process has been studied. Calorimetric and magnetization results show that the temperature of structural phase transition coincide with the Curie temperature and fall within the temperature range 270-355 K. The magnetic entropy change reaches the maximum value for the compound with x=0.28 and equals to 32 J/(kg K) for the magnetic field change of 5 T. The adiabatic temperature change for the same sample, measured using magnetocalorimeter, is equal to 1.2 K for the magnetic field change of 1.7 T. It was found that the increase of Ge content in the sample causes weakening of first order magnetic transition, which is manifested by the lowering difference in transition temperature measured in two zero-field-cooling and field-cooled-cooling regimes.
Źródło:
Acta Physica Polonica A; 2015, 128, 1; 76-80
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 42

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