The Silver Iodide–Thallium Iodide Pseudo-Binary System

Abstract

A form of the T-x section of the equilibrium phase diagram for the system AgI-TI1 is proposed on the basis of thermal and X-ray diffraction data. Two room temperature stable intermediate phases AgTII, and AgT& are confirmed, and evidence is found for two other phases, stable a t higher temperatures. The electrical conductivity is determined principally by the fraction of AgI present; fast ion conduction occurred only when or-AgI was present.Une forme du section du diagramme de phases pour le systeme AgI-TlI est propose sur la base daccidents thermiques et de diffraction de rayons S. Deux phases intermedianes AgTlI, et AgTl,I, de temperature ambiente etaient verifies, et evidence ktait trouvrk pour deux antres phases stables b temperatures plus hautes. Le conductivitk electrique h i t determine au primaire pour le fraction de AgI present aux matkriaux conduction vite ionique n'occurait que quand u-AgI Ctait present.

Die Kristallstrukturen von Tl2AgI3 und NaAgI2 · 3 H2O

“…Dithallium-triiodoargentat Tl,AgI, entspricht in der Zusammensetzung den Iodoargentaten K2AgI, [3], Rb,AgI,[4] und Cs,AgI, [5] bzw. dem Iodocuprat (1) Tl, CuI,[ 6 ] . In den Kristallstrukturen der Alkali-Iodoargentate sind Ag1,-Tetraeder iiber gemeinsame Ecken zu Ketten f, [AgI,,21,]…”

Phase diagram and thermodynamic properties of compounds of the AgI–TlI–I system

“…[10]. Moreover, X-ray powder diffraction study of alloys of the AgI-TlI system with 80 and 90 mol.% AgI quenched after annealing at 570 K did not confirm the literature assumption [11] about the existence of the -phase in the temperature range of 478-633 K. Apparently, the specified alloys consisted of two-phase mixtures of AgI and AgTlI 2 .…”

“…The ternary Ag-Tl-I system was investigated by several authors [10][11][12], mainly with respect to the AgI-TlI section. According to the literature [10] this section includes two ternary compounds AgTl 2 I 3 and AgTlI 2 melting congruently at 600 K and incongruently by the peritectic reaction at 513 K, respectively.…”

“…The eutectic compositions were found to be 70 and 27 mol% TlI at temperatures 590 and 475 K, respectively. Other sources [11,12] state that AgTlI 2 forms by the peritectoid reaction at 498-500 K, whereas AgTl 2 I 3 melts congruently at 604 K. Also, the coordinates of eutectic points presented in the literature [10][11][12] are different. Our preliminary data [13] enabled us to refine accurately the T-x diagram of the quasi-binary AgI-TlI system (Fig.…”

Pushing thermal conductivity to its lower limit in crystals with simple structures

“…Herein, we synthesized a simple crystal structure phase AgTlI 2 (space group I4/mcm; eight atoms in the primitive cell (PC)) and found that it exhibits an exceedingly low κ of 0.25 W/mK at room temperature. AgTlI 2 was synthesized 22 , 23 and found to be an electrical insulator 23 , while no measurement of κ has been reported in the literature. We performed single-crystal diffraction refinement and found a considerable negative part of the probability density function for Ag atoms, directly unearthing the strongly anharmonic nature of Ag atoms.…”