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Title: Effect of Ce doping on the electrocaloric effect of Sr{sub x}Ba{sub 1−x}Nb{sub 2}O{sub 6} single crystals

The electrocaloric effect (ECE) of Sr{sub x}Ba{sub (1−x)}Nb{sub 2}O{sub 6} (SBN100x) single crystals, with a tetragonal tungsten bronze structure and a high ECE near room temperature, is studied by direct measurements. It is shown that although the onset of the ECE peak is closer to room temperature in SBN80 than in SBN75, the effect of the increase of the strontium content is very detrimental to the ECE performances with a decrease to ΔT{sub EC} = 0.23 K for SBN80 from the reported value of ΔT{sub EC} = 0.42 K under 10 kV/cm for SBN75 [F. Le Goupil et al., “Anisotropy of the electrocaloric effect in lead-free relaxor ferroelectrics,” Adv. Energy Mater. (published online)]. However, when 1.40% of cerium is introduced in SBN61, the temperature of depolarisation is shifted below 30 °C, while an ECE above 0.6 K is maintained over more than 70 K for a low electric field of 28 kV/cm. The maximum ECE ΔT{sub EC} = 0.85 K is measured at 61 °C. In addition to having an ECE peak close to room temperature, the ECE measured in Ce-doped SBN61 is comparable with the best reported values for lead-free materials [Y. Bai et al., J. Appl. Phys. 110, 094103 (2011); X.-S. Qian et al., Adv. Funct. Mater. 24, 1300 (2014)], when linearly extrapolatedmore » to higher electric fields.« less
Authors:
; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Department of Materials, Imperial College London, London SW7 2AZ (United Kingdom)
  2. (United Kingdom)
  3. Materials Research Laboratory, University of Nova Gorica, Nova Gorica 5000 (Slovenia)
  4. Insitute of Electronic Materials Technology, 133 Wolczynska St., 01-919 Warsaw (Poland)
  5. Institute of Materials Science, University of Silesia, 12 Bankowa St., PL 40-007 Katowice (Poland)
Publication Date:
OSTI Identifier:
22300086
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; BARIUM COMPOUNDS; CALORIMETRY; CERIUM ADDITIONS; CRYSTAL STRUCTURE; DOPED MATERIALS; ELECTRIC FIELDS; FERROELECTRIC MATERIALS; MONOCRYSTALS; NIOBATES; STRONTIUM COMPOUNDS; TEMPERATURE RANGE 0273-0400 K; THERMOELECTRIC PROPERTIES