ChemInform Abstract: Tl₂Te and Its Relationship with Tl₅Te₃.

Abstract

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Phase equilibria study in systems Tl-Pb(Nd)-Bi-Te new phases of variable composition on the base of Tl9BiTe6

“…The X-ray analyses of alloys on section Tl 2 Te-Tl 8.5 PbBi 0.5 Te 6 show, that the alloy of composition 5 mol% Tl 8.5 PbBi 0.5 Te 6 has the diffraction pattern completely identical with Tl 2 Te which crystallizes in monoclinic lattice [26] and all other investigated alloys have the structure of Tl 5 Te 3 type (Table 1; Fig. 3) We assume, that on this section at ∼7-8 mol% Tl 8.5 PbBi 0.5 Te6 composition morphotropic phase transformation ␣ ↔ ␦ occurs (where ␣-solid solutions on the base Tl 2 Te) and biphase area ␣ + ␦ is degenerated.…”

Phase relations in the Tl2 Te–TlBiТe2 –TlTbTe2 system

“…Исходные соединения и фазовые равновесия в граничных системах изучены довольно подробно [33,[37][38][39][40][41][42][43].…”

“…Tl 2 Te плавится конгруэнтно при 698 [37] и кристаллизуется в моноклинной структуре (Пр.Гр. С 2 /С; a = 15.662; b = 8.987; с = 31.196Å, b = 100.76°, z = 44) [38].…”

“…Система Tl 2 Te-TlBiТe 2 , изученная авторами [38], характеризуется образованием конгруэнтно плавящего при 830 К соединения Tl 9 BiTe 6 . Это соединение кристаллизуется в тетрагональной решетке и имеет следующие параметры решетки a = 8.855, c = 13.048 Å, z = 2 [42].…”