The crystal structure of semiconductors of (Bi
l-xSb
x)
2(Te
1-ySe
y)
3 system has been found to be either hexagonal or orthorhombic for all compositions from X-ray analysis.
Atomic parameters (
u,
v) of crystal structure and bond lengths (
dl,
d2,
d3) in the whole range of the hexagonal structure are determined by X-ray powder pattern techniques. In this region atomic parameters,
u and
v are 0.400 and 0.209, respectively.
Bond lengths can be expressed in terms of the composition parameters x, y in the following equations;
dl(
M-X1)=3.25-(0.054x+0.184y) (Å)
d2(
M-X2)=3.08-(0.057x+0.176y) (Å)
d3(
X2-
X2)=3.62-(0.048x+0.198y) (Å)
Relations between the crystalographic data and physical properties are discussed.
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