Lanthanum-magnesium and lanthanum-manganese donor-acceptor-codoped semiconducting barium titanate

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb06514.x· OSTI ID:6785818

Ting, C J; Peng, C J ^[1]; Wu, S T ^[2]; Lu, H Y

---

1. Materials Research Lab., Industrial Technology Research Inst., Chutung (TW)
2. National Tsing Hua Univ., Hsinchu (Taiwan)

BaTiO{sub 3} powder doped with La donor and codoped with Mn or Mg acceptor was sintered at 1350{degrees}C/1 h in air. For La-doped BaTiO{sub 3} the room-temperature resistivity decreased to a minimum at (La{sup 3 +}) {approximately} 0.15 mol%. For La-Mn-codoped BaTiO{sub 3}, the minimum resistivity occurred at (La{sup 3 +}) {minus} 2(Mn{sup 2 +}) {approximately} 0.15 mol%. When the ceramic was changed to a fine grained insulator by high donor doping ((La{sup 3 +}) {gt} 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{sup 3 +}) {minus} 2(Mg{sup 2 +}) = 0.15 mol% or (La{sup 3 +}) {minus} 2(Mn{sup 2 +}) = 0.15 mol%. The analogy of a compensation effect between La-Mn- and La-Mg-codoped BaTiO{sub 3} suggested that Mn acceptor added to BaTiO{sub 3} exists as Mn{sup 2 +} ion in the bulk grain region; its influence on the positive temperature coefficient of resistivity behavior is then discussed.

• OSTI ID: 6785818
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 73:2; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360603 -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
MAGNESIUM ADDITIONS
MAGNESIUM ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SEMICONDUCTOR MATERIALS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS