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Wyświetlanie 1-15 z 42
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:
Interaction of the Components in the $BaO-Tb_2 O_{3+δ}-CuO$ and Related Systems
Autorzy:
Zaremba, O.
Gladyshevskii, R.
Powiązania:
https://bibliotekanauki.pl/articles/1398239.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
Opis:
The isothermal section of the phase diagram of the $BaO-Tb_2 O_{3+δ}-CuO$ system at 1173 K was constructed based on X-ray powder diffraction data. The existence of the compounds BaTbO₃ (SrZrO₃ structure type, I4/mcm, a = 0.6034(1), c = 0.8576(1) nm) and Ba₄₄Cu₄₅O₉₀ (own structure type, Im-3m, a =1.8266(3) nm) was confirmed in the binary BaO-Tb₂O₃ and BaO-CuO systems, respectively, but no ternary oxides were found. The investigation of samples with nominal composition $A_{0.5}Tb_{0.5}TO_3$ (A = Ca, Sr or Ba, T = Ni or Zn) showed the presence of phases from the corresponding binary systems, or unreacted reagents.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1024-1026
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
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:
Refinement of the Modulated Structures of Pb-Free and Pb-Doped Bi-2223 HTSC
Autorzy:
Shcherban, O.
Akselrud, L.
Giannini, E.
Gladyshevskii, R.
Powiązania:
https://bibliotekanauki.pl/articles/1030916.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
74.72.-h
Opis:
The incommensurate modulated structures of Pb-free and Pb-doped Bi-2223 phases were refined on single-crystal X-ray diffraction data.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1027-1029
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Structure Characterisation of Micro-and Nanocrystalline Powders of Dy_{1-x}R_xFeO₃ (R = La, Pr, Nd, Sm, Gd)
Autorzy:
Pavlovska, O.
Lutsyuk, I.
Kondyr, A.
Zhydachevskyy, Ya.
Vakhula, Ya.
Pieniążek, A.
Vasylechko, L.
Powiązania:
https://bibliotekanauki.pl/articles/1029717.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
61.05.cp
Opis:
This work deals with the study of the phase and crystal structure behaviour of new micro- and nanocrystalline ferrites Dy_{1-x}R_xFeO₃ obtained by solid state reactions (R = La, Pr) and sol-gel citrate (R = Nd, Sm, Gd) techniques. It was established that all synthesized samples adopt orthorhombic perovskite structure isotypic with GdFeO₃. Unit cell dimensions and atomic coordinates of the mixed rare earth ferrites derived by full profile Rietveld refinement technique agree well with the data of the "pure" DyFeO₃ and RFeO₃ compounds, thus proving formation of continuous solid solutions Dy_{1-x}R_xFeO₃ in the DyFeO₃-RFeO₃ systems (R = La, Pr, Nd, Sm, Gd). Peculiarity of the Dy_{1-x}La_xFeO₃ series is the lattice parameters crossover and formation of dimensionally tetragonal structure at x ≈0.97.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 802-805
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:
X-Ray Study of Synthetic Alunite
Autorzy:
Paszkowicz, W.
Dynowska, E.
Świerkocki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1931684.pdf
Data publikacji:
1994-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Lx
61.66.Fn
Opis:
Synthetic alunite was obtained by two different synthesis methods. Powder data obtained with a standard Bragg-Brentano geometry of two analyzed samples are reported for a broad angular range. The chemical analysis as well as the unit-cell dimensions indicate that the analyzed alunite is K and Al deficient and contains excess water. A need for high resolution diffraction experiments is expressed.
Źródło:
Acta Physica Polonica A; 1994, 86, 4; 621-627
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:
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:
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:
Cobalt Additives Influence on Phase Composition and Defect Structure of Manganese Dioxide Prepared from Fluorine Containing Electrolytes
Autorzy:
Sokolsky, G.
Ivanov, S.
Ivanova, N.
Boldurev, Ye.
Kobulinskaya, O.
Demchenko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1550089.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
61.72.-y
85.40.Ry
Opis:
Manganese dioxide samples were prepared from fluorine containing electrolytes with additives of $Co^{2+}$ ions. Atomic absorption spectroscopy, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis were the methods of the samples characterisation. Manganese dioxide at the presence of cobalt forms nanosized ramsdellite structure crystallites of mostly needle-like morphology with significant content of hydroxide groups. The main phase state in manganese dioxide samples obtained at the presence of cobalt is $γ-MnO_{2}$ with ramsdellite structure and low content of intergrowth defects. The sample doped both with lithium and cobalt can be indexed to a hollandite-type structure (tetragonal; space group I4/m) of $α-MnO_{2}$.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 86-90
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ORR Electrocatalysis on Cr³⁺, Fe²⁺, Co²⁺-Doped Manganese(IV) Oxides
Autorzy:
Sokolsky, G.
Zudina, L.
Boldyrev, E.
Miroshnikov, O.
Gauk, N.
Kiporenko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1030872.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Fn
61.72.-y
85.40.Ry
Opis:
The ionic dopant additives have different mechanisms of their influence upon MnO₂ electrocrystallisation process and depending on dopants added the following polymorphs are stabilised: α -MnO₂ (hollandite, I4/m) - NH₄⁺; γ -MnO₂ (ramsdellite, Pbnm) - Co²⁺, Fe²⁺; layered polymorph δ -MnO₂ (birnessite, C2/m) - Cr³⁺. The defect states of intergrowth method in ramsdellite matrix and twinning, OH groups studied by X-ray diffraction and the Fourier transform infrared mtehod, respectively, indicate their high content in case of Fe²⁺ and Co²⁺-doped manganese dioxide. CVA oxygen reduction reaction peaks were established after experiments in alkaline electrolytes and dioxygen (argon, air) atmosphere. Activity of doped samples studied is comparable with other published data. Both doped with Co²⁺ and Fe²⁺ samples display maximal currents and some distinctive features in oxygen reduction reaction.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1097-1102
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
Wyświetlanie 1-15 z 42

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