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2005
Equilibria
E 4000
06- 018
Formation and Phase Transition of Argyrodite Type Ag7TaSe 6xS6(1-x) Solid Solution. — The title compounds are prepared from mixtures of the elements and Ag2S
(873 K, 4 d). As revealed by powder XRD, the cubic solid solutions form over the
whole composition range with F43m and P213 phases existing in the range of
0 ≤ x ≤ 0.93 and 0.95 ≤ x ≤ 1, respectively. Ag7TaSe6 and Ag7TaS6 transform to the
fcc-high temperature form above 324 K and to the monoclinic low temperature one
below 250 K, respectively. The transition temperature decreases away from the two
pure end-member compositions. — (WADA*, H.; ONODA, M.; ISHII, M.; SATO, A.;
TANSHO, M.; IYI, N.; J. Alloys Compd. 383 (2004) 1-2, 144-147; Adv. Mater. Lab.,
Natl. Inst. Mater. Sci., Tsukuba, Ibaraki 305, Japan; Eng.) — W. Pewestorf
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