Super-protonic phase transition and fast ionic conductivity of Li+ in [Li0.2(NH4)0.8]2TeCl6

Autor:	Ahlem Kabadou, R. Karray, A. Ben Salah, S. Jarraya
Rok vydání:	2006
Předmět:	Phase transition Differential scanning calorimetry Chemistry Electrical resistivity and conductivity Phase (matter) Analytical chemistry Ionic conductivity General Materials Science General Chemistry Dielectric Activation energy Conductivity Condensed Matter Physics
Zdroj:	Solid State Ionics. 177:89-93
ISSN:	0167-2738
Popis:	The differential scanning calorimetry diagram of [Li 0.2 (NH 4 ) 0.8 ] 2 TeCl 6 showed one anomaly at 526 K accompanied with a shoulder at 505 K. The conductivity plot exhibits two anomalies at 496 and 526 K, which characterize the beginning and the end of the crossing to superionic conductor state. The low temperature conduction is ensured essentially by Li + . A sudden jump confirms the presence of a superionic protonic transition related to the fast motion of Li + and H + ions. Above 526 K, the high temperature phase is characterized by high electrical conductivity (10 − 3 Ω − 1 m − 1 ) and low activation energy ( E a The dielectric constant evolution as a function of frequency and temperature revealed the same anomaly. Transport properties in this material appear to be due to Li + and H + ions' hopping mechanism.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cb8595af1df17464c304ed27483695f5 https://doi.org/10.1016/j.ssi.2005.09.049 Zobrazit plný text záznamu Full Text from ScienceDirect