Oxidation-induced strain relaxation and related dielectric-temperature behavior in core/shell grained BaTiO3

Cited 1 time in webofscience Cited 0 time in scopus
  • Hit : 522
  • Download : 0
The effect of oxidation on dielectric-temperature behavior of core/shell grained BaTiO3 was studied in an attempt to reveal the prime governing parameter of dielectric-temperature behavior. BaTiO3 samples doped with 3 mol% Y2O3 or 3 mol% Dy2O3 with the same effective charges were sintered in a reducing atmosphere (Po-2 < 10(-13)) and oxidized at 1050-1250 A degrees C for 10 h in air. In the Y-doped samples, as the oxidation temperature increased, the fraction of the grains with ferroelectric domains in the shell increased from 18 to 54 % and the residual strain decreased. With an increased domain fraction, the dielectric-temperature behavior became poor, and a dielectric peak appeared. On the other hand, all the Dy-doped and air-annealed samples exhibited relatively high fractions of grains with ferroelectric domains in the shell, 32 % at 1050 A degrees C and 63 % at 1250 A degrees C, indicating a considerable reduction of residual strain in all the samples. The temperature stability of the Dy-doped samples was poor, and there was a dielectric peak, irrespective of the oxidation temperature. This difference in dielectric response between the Y-doped and Dy-doped samples reveals that the prime factor governing the dielectric-temperature stability is the residual strain in the core/shell grains rather than the previously suggested factors of defect concentration, dopant concentration in the shell and the occupational sites of rare-earth dopants.
Publisher
SPRINGER
Issue Date
2015-12
Language
English
Article Type
Article
Keywords

MULTILAYER CERAMIC CAPACITORS; MN SUBSTITUTED BATIO3; CORE-SHELL STRUCTURE; BARIUM-TITANATE; OXYGEN NONSTOICHIOMETRY; INSULATION RESISTANCE; OCCUPATIONAL SITES; CURIE-TEMPERATURE; DOMAIN FORMATION; RARE-EARTH

Citation

JOURNAL OF ELECTROCERAMICS, v.35, no.1-4, pp.129 - 134

ISSN
1385-3449
DOI
10.1007/s10832-015-0004-z
URI
http://hdl.handle.net/10203/205500
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 1 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0