Electrical Properties of Nd-Doped BaTiO sub(3) PTC Ceramics Prepared by Hydrothermal Synthesis

Nd-doped BaTiO sub(3) nanopowders with ca. 200 nm in average diameter were prepared by hydrothermal synthesis at 200 and 240 [degrees]C for 24 h. Neodymium (III) nitrate hexahydrate (Nd(NO sub(3)) sub(3) [middot] 6H sub(2)O) as a donor dopant was added to the powder mixtures of barium hydroxide (Ba(...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2011-01, Vol.18, p.1-4
Main Authors: Hashishin, T, Sato, E, Umeki, S, Kojima, K, Tamaki, J
Format: Article
Language:English
Subjects:
Barium hydroxide
Barium titanates
Curie temperature
Electrical properties
Neodymium
Sintering
Synthesis
Titanium dioxide
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Summary:Nd-doped BaTiO sub(3) nanopowders with ca. 200 nm in average diameter were prepared by hydrothermal synthesis at 200 and 240 [degrees]C for 24 h. Neodymium (III) nitrate hexahydrate (Nd(NO sub(3)) sub(3) [middot] 6H sub(2)O) as a donor dopant was added to the powder mixtures of barium hydroxide (Ba(OH) sub(2)) and titanium dioxide (TiO sub(2)) ranging from 0.25 to 0.45 mol%. A green compact of the powder mixtures obtained was heated at 1340 [degrees]C for 2 h with/without three steps of ramp heating processes. Sintered without these steps, 0.35 mol% Nd-doped BaTiO sub(3) with the resistivity of 124 ohm[middot]cm at R. T. indicated insufficient PTCR effect; resistance change of 3 x 10 super(2) in the vicinity of Curie temperature. On the other hand, a pellet of 0.35 mol% Nd-doped BaTiO sub(3) sintered via the step-heating process exhibited the large resistance change of 7.5 x 10 super(3).
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/18/9/092031