Abstract
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(00γ)s00 (No. 63.2) with lattice parameters of a = 4.295(1), b = 25.371(4), c = 4.306(1) Å (173K), a = 4.297(1), b = 25.408(4), c = 4.309(1) Å (293 K), and a = 4.309(1), b = 25.481(6), c = 4,321(1) Å (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.
Original language | English |
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Pages (from-to) | 5865-5872 |
Number of pages | 8 |
Journal | Chemistry - A European Journal |
Volume | 9 |
Issue number | 23 |
DOIs | |
Publication status | Published - 2003 Dec 5 |
Externally published | Yes |
Free keywords
- Charge-density wave
- Electron holography
- Lanthanides
- Polychalcogenides
- Solid-state structure