The Phase Co1-xNixSn2: Structural Variations Based on the Stacking of Two Different Planar Nets
详细信息 查看全文
- 作者：Ulrich Hä ; ussermann ; Angel R. Landa-Cá ; novas ; and Sven Lidin
- 刊名：Inorganic Chemistry
- 出版年：1997
- 出版时间：September 24, 1997
- 年：1997
- 卷：36
- 期：20
- 页码：4307 - 4315
- 全文大小：453K
- 年卷期：v.36,no.20(September 24, 1997)
- ISSN：1520-510X
文摘
The investigation of the tin-rich part of the ternary systemCo/Ni/Sn yielded the phaseCo1-xNixSn2with therange of composition 0.23(3) < x < 0.59(3).When using a large excess of tin,Co1-xNixSn2crystallizes at 500
C in a structure isotypic to that of tetragonal PdSn2whereas a modification with the orthorhombic CoGe2structuretype always forms from a stoichiometric mixture of the elementalcomponents or from a tin melt at temperaturesabove 550 C. The structures ofCo0.625Ni0.375Sn2 weredetermined by single-crystal X-ray diffraction methods(PdSn2-type space groupI41/acd, a =6.2360(5) Å, c = 23.588(2) Å, Z =16; CoGe2-type space group Aba2,a= 6.2439(4) Å, b = 6.2493(4) Å, c= 11.778(1) Å, Z = 8). Both structures havethe same building unit consistingof three consecutive planar nets 44,32434, 44 formed by tin atoms. Thecondensation of the building blocks inthe c direction gives rise to different stacking sequences.In the PdSn2-type, a ABCD sequence is realizedandthe c axis is doubled compared to the idealCoGe2-type with AB stacking. Electron diffraction andhigh-resolutionelectron microscopy studies revealed the existence of other, complex,stacking variants as well as stacking faultsin theCo1-xNixSn2system.
C in a structure isotypic to that of tetragonal PdSn2whereas a modification with the orthorhombic CoGe2structuretype always forms from a stoichiometric mixture of the elementalcomponents or from a tin melt at temperaturesabove 550 C. The structures ofCo0.625Ni0.375Sn2 weredetermined by single-crystal X-ray diffraction methods(PdSn2-type space groupI41/acd, a =6.2360(5) Å, c = 23.588(2) Å, Z =16; CoGe2-type space group Aba2,a= 6.2439(4) Å, b = 6.2493(4) Å, c= 11.778(1) Å, Z = 8). Both structures havethe same building unit consistingof three consecutive planar nets 44,32434, 44 formed by tin atoms. Thecondensation of the building blocks inthe c direction gives rise to different stacking sequences.In the PdSn2-type, a ABCD sequence is realizedandthe c axis is doubled compared to the idealCoGe2-type with AB stacking. Electron diffraction andhigh-resolutionelectron microscopy studies revealed the existence of other, complex,stacking variants as well as stacking faultsin theCo1-xNixSn2system.