Geller, S. ; Ray, A. K. ; Fardi, H. Z. ; Nag, K. (1982) New solid electrolyte: CsCu4Cl3I2 Physical Review - B: Solid State, 25 (4). pp. 2968-2970. ISSN 0556-2805
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Official URL: http://prb.aps.org/abstract/PRB/v25/i4/p2968_1
Related URL: http://dx.doi.org/10.1103/PhysRevB.25.2968
The solid electrolyte α-CsCu4Cl3I2 is thermodynamically stable above 431 K and to at least 505 K. It is isostructural with RbCu4Cl3I2. At 431 K it has a conductivity of 0.76Ω-1 cm-1, at 419 K the conductivity is 0.72Ω-1 cm-1 and extrapolation to 298 K gives 0.29Ω-1 cm-1. When corrected for deviation of bulk from x-ray density, the expected values are 0.84, 0.80, and 0.35Ω-1 cm-1, respectively. Its activation enthalpy of motion is 0.112 eV. There are two first-order phase transitions: β-α at 431 K and γ-β at 418 K; both are very sluggish. The a phase does not reconvert to the β phase; it returns to the γ phase below ~418 K. At 298 K the conductivity of the γ phase is 5.3×10-6 Ω-1 cm-1, at 425.5 K, the conductivity of the ß phase is 0.11Ω-1 cm-1. The enthalpy of activation of motion of the β phase is 0.77 eV. The γ phase is orthorhombic with a=14.242, b=24.984, c=11.712 Å, probable space groups Cmca or C2ca, and 16 CsCu4Cl3I2 in the unit cell.
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