Electrical conduction mechanism in La3Ta0.5Ga 5.3Al0.2O14 single crystals

Ritsuko Yaokawa, Katsumi Aota, Satoshi Uda

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2 Citations (Scopus)

Abstract

The electrical conduction mechanism in La3Ta 0.5Ga5.3Al0.2O14 (LTGA) single crystals was studied by nonstoichiometric defect formation during crystal growth. Since stoichiometric LTGA is not congruent, the single crystal grown from the stoichiometric melt was Ta-poor and Al-rich, where Al atoms were substituted not only in Ga sites but also in Ta sites. The population of the substitutional Al in Ta sites increased with increasing oxygen partial pressure during growth (growth-pO2) in the range from 0.01 to 1 atm. Below 600 °C, substitutional Al atoms in Ta sites were ionized to yield holes, and thus the electrical conductivity of the LTGA crystal depended on temperature and the growth-pO2. The dependence of the electrical conductivity on the growth-pO2 decreased as temperature increased. The temperature rise increases ionic conductivity, for which the dominant carriers are oxygen defects formed by the anion Frenkel reaction.

Original languageEnglish
Article number224101
JournalJournal of Applied Physics
Volume114
Issue number22
DOIs
Publication statusPublished - 2013 Dec 14

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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