Solid solutions AgxCu2-xHgI4 prepared by a solution method were characterised by powder X-ray diffraction, differential scanning calorimetry (DSC) and electrical conductivity. X-ray diffractograms showed tetragonal phases over the whole range expept for 1.14 ≤ × ≤ 1.30 where a single cubic phase was seen. DSC showed a strong compositional dependence in the order-disorder transition temperature. Temperature variation of electrical conductivity carried out for all compositions showed an increase in conductivity by two orders of magnitude at the transition temperature. The composition x=1.14 having a maximum room temperature conductivity with a minimum transition temperature has the characteristics of an eutectoid of the Ag2Hgl4-Cu2HgI4 system. © 1991.

Krishnaswamy Hariharan

ELECTROLYTES, SOLID

Solid solutions

Thermal effects

X-Rays - Diffraction

Differential scanning calorimetry

Silver compounds

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IIT Madras

Transport and thermal properties of the solid electrolyte AgxCu2-xHgI4

Solid State Communications

Lattice parameters of the solid electrolyte AgxCu2-xHgI4 have been determined for the different values ofx between 0 and 2. All compositions studied showed a tetragonal phase, except for a small range fromx = 1.14 tox = 1.30. Compositions in this range had a cubic phase. The lattice parametersa andc of compositions outside this range increased steadily from 6.07 and 12.15A °, respectively, forx = 0 (Cu2HgI4) to 6.29 and 12.55A °forx = 2 (Ag2HgI4). Compositions in the region1.14 ≤ x ≦ 1.3 that had cubic phases were found to have lattice parametera between 6.22 and 6.26A °. The frequency-dependent conductivity of all compositions showed two distinct regions at low temperatures: a frequency-independent plateau region at lower frequencies (1 Hz to 10 kHz) and a power law variation,Aωn, at higher frequencies (10 to 65 kHz). At higher temperatures (&gt;328 K) electrode polarization effects were seen at low frequencies and a frequency-independent plateau region at higher frequencies. The frequency-independent (i.e., dc) conductivity was on the order of 10-5 (Ω cm-1) for compositions1.14 ≤ x ≤ 1.3. © 1992 Academic Press, Inc. All rights reserved.

Journal of Solid State Chemistry

Structural aspects and ac conductivity of the solid electrolyte AgxCu2-xHgI4

Solid State Ionics

Tricritical point in the p-T phase diagram of Ag2HgI4

Physik Journal

Notizen

Journal of Physics and Chemistry of Solids

Single crystal polarized Raman spectra of the solid electrolyte Cu2HgI4; attempt frequencies for ion motion in Ag2HgI4

Electrical conductivity and composition range of Ag2HgI4 between room temperature and 75°C

The effects of thermal activation on the complex conductivity of Ag2HgI4 in the microwave region

Journal	Solid State Communications
ISSN	00381098
Open Access	No