Besetzungsvarianten der CaMnBi₂-Struktur: Zur Kenntnis der Verbindungen LaZn_0,52Sb₂, LaCo_0,68Sb₂, LaMn_xSb₂ (0,65≤x≤ 0,76) und LaCu_x-Sb₂ (0,82≤x≤ 0,87) / New Compounds with the CaMnBi₂ Structure: On LaZn_0,52Sb₂, LaCo_0,68Sb₂, LaMn_xSb₂ (0,65≤x≤ 0,76) und LaCu_x-Sb₂ (0,82≤x≤ 0,87)

Abstract

<jats:p>The new compounds LaZn<jats:sub>0,52</jats:sub>Sb<jats:sub>2</jats:sub>, LaCo<jats:sub>0,68</jats:sub>Sb<jats:sub>2</jats:sub>, LaMn<jats:sub>x</jats:sub>Sb<jats:sub>2</jats:sub> (0.65 ≤ x ≤ 0.76) and LaCu<jats:sub>x</jats:sub>Sb<jats:sub>2</jats:sub> (0.82 ≤x≤ 0.87) crystallize in the tetragonal system , space group P4/nmm (N o. 129) with the CaMnBi<jats:sub>2</jats:sub> structure. The lattice constants are:</jats:p><jats:p>LaZn<jats:sub>0,52</jats:sub>Sb<jats:sub>2</jats:sub>: a = 438.0(3) pm, c = 1048.8(5) pm, c/a = 2.395; LaCo<jats:sub>0,68</jats:sub>Sb<jats:sub>2</jats:sub>: a = 439.4(3) pm, c = 995.4(5) pm, c/a = 2.265; LaMn<jats:sub>x</jats:sub>Sb<jats:sub>2</jats:sub>: für x = 0.65: a = 438.7(3) pm, c = 1078.0(5) pm, c/a = 2.457; für x = 0.76: a = 437.2(3) pm, c = 1093.3(5) pm, c/a = 2.501; LaCu<jats:sub>x</jats:sub>Sb<jats:sub>2</jats:sub>: für x = 0.82: a = 440.2(3) pm, c = 1015.4(5) pm, c/a = 2.307; für x = 0.87; a = 437.3(3) pm, c = 1040.0(5) pm, c/a = 2.378.</jats:p>

The Praseodymium Zinc Arsenide Pr3Zn2As6: Crystallizing with a Vacancy Variant of the HfCuSi2Type Structure

“…Single-crystal structure determinations of the antimonides CeAgSb (4, 10) and LaAuSb (6) showed that all atomic positions are fully occupied. In contrast, the structure refinements of three different crystals of the compound LaMn \V Sb showed considerable defects for the manganese position: LaMn Sb (11), LaMn Sb (6), and LaMn Sb (11). Similar defects were found during the structure refinements of LaCo Sb (11), LaCu Sb (11), LaCu Sb (11), LaZn Sb (11), and LaCd Sb (6).…”

Building up Complexity from Strips and Sheets: The Electronic Structure of the La12Mn2Sb30Alloy

“…Linkage of the (still very hypothetical) one-dimensional XeO polymers (4) by sharing the remaining vertices will produce a two-dimensional square sheet (6). One has to replace doubly connected oxygen atoms by quadruply connected carbon atoms in order to preserve the electron count at Xe of Xe>.…”

Anisotropic magnetization and transport properties of RAgSb₂ (R=Y, La-Nd, Sm, Gd-Tm)

“…In order to check for any partial occupancies in the RAgSb2 series, which occur in the related RTSb2 phases with T = Mn, Fe, Co, Ni, Cu, Zn, and Cd (Sologub, 1994;Wollesen, 1996;Leithe-Jasper, 1994;Albering, 1996;Cordier, 1985), a single crystal structure determination was performed on GdAgSbz using a Rigaku AFC6R diffractometer with graphite monochromated Mo Ku (1.= 0.71069~) radiation and a 12 kW rotating anode generator. The data were collected at room temperature using the co-2e scan technique to a maximum 26 value of 60.2°.…”