Autor: Iwanowski, K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: EXAFS Determination of Bond Lengths in Zn$\text{}_{1-x}$Fe$\text{}_{x}$S Ternary Alloys
Autorzy:: Iwanowski, R. J.
Ławniczak-Jabłońska, K.
Powiązania:: https://bibliotekanauki.pl/articles/1963384.pdf
Data publikacji:: 1997-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Dm
Opis:: Studies of local atomic structure in the zinc-blende Zn$\text{}_{1-x}$Fe$\text{}_{x}$S (x=0.11-0.50) diluted magnetic semiconductors with the use of the EXAFS technique are reported for the first time. They include the K-edge EXAFS measurements for both cationic elements (Zn, Fe). The experiment was carried out at room temperature in the transmission mode using synchrotron radiation of the DCI storage ring in Orsay, France. A detailed EXAFS analysis for different crystal compositions (x) gave a convincing evidence for a bimodal distribution of the nearest-neighbour interatomic distances in Zn$\text{}_{1-x}$Fe$\text{}_{x}$S within the iron solid-solubility limit. It has also revealed, within the accuracy of this method, constancy of both the nearest-neighbour cation-anion distances (i.e. Zn-S and Fe-S) in the composition range studied.
Źródło:: Acta Physica Polonica A; 1997, 91, 4; 797-801
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Chemical Shifts at K-Absorption Edges of Transition Metals Admixed To ZnS and ZnSe
Autorzy:: Iwanowski, R. J.
Ławniczak-Jabłońska, K.
Traverse, A.
Powiązania:: https://bibliotekanauki.pl/articles/1963385.pdf
Data publikacji:: 1997-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Dm
Opis:: This paper gives the experimental evidence of systematic X-ray K-absorption edge studies in an effort to analyse the effect of cation chemical shift in the group of compounds type Zn$\text{}_{1-x}$M$\text{}_{x}$A (M = Mn, Fe, Co, Ni; A = S, Se). The observed chemical shift was found practically independent of the choice of anion, whereas it revealed a noticeable decrease when passing from Mn to Zn. The effect was ascribed to the change of the 3d shell occupation. The calculations of the effective cation charge (based on the theoretical approach of Kitamura and Chen, 1991) have shown that in the case of transition metals admixed to ZnS and ZnSe there is a contribution of the 3d electrons to the overall charge transfer, which indicates that the ability of 3d electrons to participate in predominantly ionic bond decreases with 3d orbit filling.
Źródło:: Acta Physica Polonica A; 1997, 91, 4; 803-808
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn$\text{}_{1-x}$Co$\text{}_{x}$S Diluted Magnetic Semiconductor Crystals
Autorzy:: Ławniczak-Jabłońska, K.
Gołacki, Z.
Paszkowicz, W.
Iwanowski, R. J.
Johansson, L.-S.
Heinonen, M.
Powiązania:: https://bibliotekanauki.pl/articles/1861485.pdf
Data publikacji:: 1993-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 79.60.-i
71.20.Fi
Opis:: X-ray photoelectron spectroscopy and powder X-ray diffraction studies of diluted magnetic semiconducting alloys Zn_{1-x}Co_{x}S, in the composition range 0 ≤ x ≤ 0.18, were performed. The analysis of XPS spectra has shown that admixture of Co into ZnS lattice does not affect the shape and position of Zn 2p core level, whereas certain modification of the S 2p peak shape was observed. The detected binding energy of Co indicated similarity between Co-S and Co-O bond structure. Significant contributions of Co 3d^{7} electrons to the valence band density of states were revealed.
Źródło:: Acta Physica Polonica A; 1993, 84, 4; 633-636
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

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

Informacja