Anomalous temperature dependency of the Anderson–Grüneisen parameters in high ionic conductors

Ionic Conductors: Effect of Temperature on Conductivity and Mechanical Properties and Their Interrelations

“…For the cases of AgBr and CaF 2 we observe a peak. Such kind of peaked behavior has been also observed in other ionic conducting materials investigated, PbF 2 and BaF 2 [20]. The peak of the AG parameter at certain temperature arises from the different relative contributions of temperature derivatives of C 11 , C 12 and the thermal expansion coefficient.…”

“…Nowadays, it is used as an important tool for investigating differ ent aspects related to thermoelastic properties of solids. Although there are some studies reporting its temperature dependence [20], usually, the AG parameter is considered as a constant of the material or depends only weakly on temperature [71]. However, for the case of ionic conducting materials, we have found that the AG parameter depends strongly on temperature [20].…”

“…On the other hand, the peak of AG parameter observed in AgBr arises mainly from the thermal expansion coefficient which exhibit a large temperature dependence. Indeed, if the temperature dependence of the thermal expansion coefficient is ignored, the peaked behavior is not observed [20]. The result of the analysis mentioned, points that the increase of the anharmonicity which is quantified by the AG parameter has different components.…”

“…Although there are some studies reporting its temperature dependence [20], usually, the AG parameter is considered as a constant of the material or depends only weakly on temperature [71]. However, for the case of ionic conducting materials, we have found that the AG parameter depends strongly on temperature [20]. The result shown in Figure 5 indicates clearly the difference between the behavior of ion conducting materials AgCl, AgBr and CaF 2 and the other non-ion conducting materials KBr, Mg 2 SiO 2 and Ag.…”

“…With the objective to gain a further understanding on the fundamental properties of superionic materials, we are studying systematically the mechanical properties of different materials [17][18][19][20]. In the present report, after showing briefly the previous works done in our group, results regarding the relation between ionic conduction and elastic properties in superionic glasses will be presented.…”