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Lanthanum‐Magnesium and Lanthanum‐Manganese Donor‐Acceptor‐Codoped Semiconducting Barium Titanate
Author(s) -
Ting ChingJui,
Peng ChengJien,
Lu HongYang,
Wu ShinnTyan
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06514.x
Subject(s) - lanthanum , acceptor , electrical resistivity and conductivity , barium titanate , materials science , manganese , doping , electroceramics , temperature coefficient , mineralogy , barium , analytical chemistry (journal) , microstructure , ceramic , inorganic chemistry , chemistry , metallurgy , condensed matter physics , composite material , medicine , microfabrication , physics , alternative medicine , optoelectronics , engineering , pathology , chromatography , fabrication , electrical engineering
BaTiO 3 powder doped with La donor and codoped with Mn or Mg acceptor was sintered at 1350°C/1 h in air. For Ladoped BaTiO 3 , the room‐temperature resistivity decreased to a minimum at [La 3+ ] ∼ 0.15 mol%. For La‐Mn‐codoped BaTiO 3 , the minimum resistivity occurred at [La 3+ ] ‐ 2[Mn 2+ ] ∼ 0.15 mol%. When the ceramic was changed to a fine‐grained insulator by high donor doping ([La 3+ ] >0.15 mol%), its semiconductivity was restored, and the relatively homogeneous, coarse‐grained microstructure recurred by codoping with either Mg or Mn acceptor, with the transition at [La 3+ ] ‐ 2[Mg 2+ ] = 0.15 mol% or [La 3+ ] ‐ 2[Mn 2+ ] = 0.15 mol%. The analogy of a compensation effect between La‐Mn‐ and La‐Mg‐codoped BaTiO 3 suggested that Mn acceptor added to BaTiO 3 exists as Mn 2+ ion in the bulk grain region; its influence on the positive temperature coefficient of resistivity behavior is then discussed.