LaSeTe2-temperature dependent structure investigation and electron holography on a charge-density-wave-hosting compound

被引：17

作者：

Doert, T

Fokwa, BPT

Simon, P

Lidin, S

Söhnel, T

机构：

[1] Dresden Univ Technol, Inst Inorgan Chem, D-01062 Dresden, Germany

[2] Dresden Univ Technol, Inst Appl Phys & Didact Phys, D-8027 Dresden, Germany

[3] Stockholm Univ, Arrhenius Lab, Inst Inorgan Chem, S-10691 Stockholm, Sweden

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2003年 / 9卷 / 23期

关键词：

charge-density wave; electron holography; lanthanides; polychalcogenides; solid-state structure;

D O I：

10.1002/chem.200305148

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Single crystals of LaSeTe2 have been prepared by reaction of the elements in a LiCl/RbCl flux at 970 K for seven days. Satellite reflections observed in diffraction experiments indicate the presence of an incommensurate lattice distortion, which is of the charge-density-wave (CDW) type. The modulated structure has been solved from X-ray data at 173, 293, and 373 K. LaSeTe2 crystallizes in the 3+1-dimensional orthorhombic superspace group Cmcm(00gamma)s00 (No. 63.2) with lattice parameters of a=4.295(1), b=25.37.1(4), c=4.306(1)Angstrom (173K), a= 4.297(1), b=25.408(4), c=4.309(1)A (293 K), and a= 4.309(1), b = 25.481(6), c=4.321(1) Angstrom (373 K). The modulation vector q = (0, 0, 0.288) does not change over the temperature interval. Electron holographic investigations confirm the existence of the modulation and help to visualize the charge-density wave.

引用

页码：5865 / 5872

页数：8

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