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Phase Diagram and Impedance Spectroscopy Study of the La 0.5+ x−y Bi y Li 0.5−3 x TiO 3 System
Author(s) -
MartínezSarrión M.L.,
Mestres L.,
Herráiz M.,
Maqueda O.,
Bakkali A.,
Fernández N.
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200207)2002:7<1794::aid-ejic1794>3.0.co;2-#
Subject(s) - bismuth , perovskite (structure) , phase diagram , chemistry , phase (matter) , analytical chemistry (journal) , solid solution , ionic bonding , ionic conductivity , powder diffraction , lithium (medication) , diffraction , conductivity , mineralogy , crystallography , ion , optics , physics , organic chemistry , medicine , electrode , chromatography , endocrinology , electrolyte
The phase diagram of the system Li 2 O/La 2 O 3 /TiO 2 /Bi 2 O 3 has been studied. Using powder X‐ray diffraction, five distinct areas have been found in the triangle Bi 0.5 Li 0.5 TiO 3 /La 2/3 TiO 3 /La 0.5 Li 0.5 TiO 3 . A region of perovskite‐like solid solutions was obtained when the bismuth content in the general formula La 0.5+ x−y Bi y Li 0.5−3 x TiO 3 was less than y = 0.10. Two two‐phase regions, one of them consisting of a perovskite‐like phase and La 2 Ti 2 O 7 , and the other a perovskite‐like phase and Li 2 TiO 3 , were obtained. One four‐phase region, consisting of a perovskite‐like phase, Li 2 TiO 3 , Bi 4 Ti 3 O 12 and La 4 Ti 3 O 12 , was also obtained. The fifth area corresponds to the melting of the initial mixtures. The microstructures of these phases were studied by SEM/EDS. The compounds of general formula La 0.5+ x −y Bi y Li 0.5−3x TiO 3 are ionic conductors. Their ionic conductivity increases when the amount of lithium rises up to x = 0.075, and decreases when the amount of bismuth increases. (© Wiley‐VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)