Autor: Iwanowski, J. - 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

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