Thermally induced lithium disorder inLi3Fe2(PO4)3

Autor:	S. E. Sigaryov, V. G. Terziev
Rok vydání:	1993
Předmět:	education.field_of_study Materials science Mössbauer effect Condensed matter physics Population chemistry.chemical_element Activation energy Ion Conductor Nuclear magnetic resonance chemistry Excited state Phenomenological model Lithium education
Zdroj:	Physical Review B. 48:16252-16255
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.48.16252
Popis:	A gradual increase of disorder with temperature in the lithium subsystem is observed for the superionic conductor ${\mathrm{Li}}_{3}$${\mathrm{Fe}}_{2}$(${\mathrm{PO}}_{4}$${)}_{3}$ for a rise from 470 K to 820 K. Structural phase transitions occurring in this temperature interval result in a continuous way in changes of the activation energy of the disordering. It differs from the abrupt disordering of the conductive ion subsystem in the vicinity of the structural phase transition, which is the usual case for the superionics. This behavior is explained within a two-level phenomenological model that assumes weak ion-ion interaction in the lithium subsystem and a population of the excited state due only to the temperature increase.
Databáze:	OpenAIRE
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