Premium
The Temperature‐Composition Phase Equilibria in the Hg 0.8 Cd 0.2 Te‐HgI 2 Pseudobinary System
Author(s) -
Hutchins Mark A.,
Wiedemeier Heribert
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200207)628:7<1489::aid-zaac1489>3.0.co;2-6
Subject(s) - differential scanning calorimetry , chemistry , ternary operation , ternary numeral system , solid solution , phase diagram , crystallography , analytical chemistry (journal) , phase (matter) , thermodynamics , stereochemistry , physics , chromatography , organic chemistry , computer science , programming language
The temperature‐composition phase equilibria of the Hg 0.8 Cd 0.2 Te‐HgI 2 system were investigated between about 100 and 800 °C using Debye‐Scherrer powder X‐ray diffraction techniques, differential thermal analysis, differential scanning calorimetry, and thermochemical and structural calculations. This system is a pseudobinary temperature‐ composition plane in the HgTe‐CdTe‐HgI 2 pseudoternary phase diagram. Measurable solid solutions of HgI 2 in Hg 0.8 Cd 0.2 Te with the cubic zinc blende‐type structure exist between about 290 and 700 °C, with a maximum solubility of 4.9 ± 0.3 mole‐% HgI 2 at 363 ± 3 °C. Further addition of HgI 2 to HgI 2 ‐saturated Hg 0.8 Cd 0.2 Te yields the formation of CdI 2 , which reduces the mole fraction (x) of CdTe in the Hg 1—x Cd x Te host lattice. After sufficient HgI 2 is added, the host lattice is depleted in CdTe and forms Hg 3 Te 2 I 2 in addition to CdI 2 . Phase fields containing the ternary compound Hg 3 TeI 4 , which we first observed in the HgTe‐HgI 2 system, also exist in the present system. Quaternary analogs of the known ternary compounds Hg 3 Te 2 I 2 and Hg 3 TeI 4 , i.e., Hg 3—y Cd y Te 2 I 2 and Hg 3—y Cd y TeI 4 , were not observed under present experimental conditions.