Published December 7, 2013 | Version v1
Journal article Metadata-only

Unification of the negative electrocaloric effect in Bi1/2Na1/2TiO3-BaTiO3 solid solutions by Ba1/2Sr1/2TiO3 doping

Creators

  • 1. Materials Research Laboratory, Institute of Physics and Electronics, University of Peshawar, Peshawar 25120 (Pakistan)
  • 2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon (Hong Kong)
  • 3. School of Materials Science and Engineering, The University of Shanghai for Science and Technology, Shanghai (China)
  • 4. Department of Materials Science and Engineering, Boise State University, Boise, Idaho 83725-2090 (United States)

Description

The microscopic mechanisms of the negative electrocaloric effect (ECE) of the single-phase (1−x)(0.94Bi1/2Na1/2TiO3-0.06BaTiO3)-xBa1/2Sr1/2TiO3 (BNT-BT-BST) perovskite solid solutions fabricated via the sol-gel technique are explored in this study. Dielectric and mechanical relaxation analyses are employed to investigate the ferroelectric and structural transitions of the samples. The electrocaloric properties of the samples were measured by thermodynamics Maxwell relations. The difference between the depolarization temperature (Td) and the maximum dielectric constant temperature (Tm) was found to decrease with increasing BST content. Doping with BST stabilized the ferroelectric phase along with unifying the EC temperature changes (ΔT) to only negative values. The origin of the uniform negative ECE of BNT-BT-BST is discussed

Additional details

Identifiers

DOI
10.1063/1.4842935;

Publishing Information

Journal Title
Journal of Applied Physics
Journal Volume
114
Journal Issue
21
Journal Page Range
p. 213519-213519.8
ISSN
0021-8979
CODEN
JAPIAU

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
45079901
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
DEPOLARIZATION; FERROELECTRIC MATERIALS; PERMITTIVITY; PEROVSKITE; RELAXATION; SOL-GEL PROCESS; SOLID SOLUTIONS; THERMODYNAMICS; THERMOELECTRIC PROPERTIES; TITANATES
Descriptors DEC
DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; DISPERSIONS; ELECTRICAL PROPERTIES; HOMOGENEOUS MIXTURES; MATERIALS; MINERALS; MIXTURES; OXIDE MINERALS; OXYGEN COMPOUNDS; PEROVSKITES; PHYSICAL PROPERTIES; SOLUTIONS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
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