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Correlation between cation order/disorder and the electrocaloric effect in the MLCCs of complex perovskite ferroelectrics

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [4];  [3];  [3];  [2];  [3]
  1. Pennsylvania State Univ., University Park, PA (United States); Penn State University
  2. Michigan Technological Univ., Houghton, MI (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. U.S. Army Combat Capabilities Development Command Aviation & Missile Center, Redstone Arsenal, AL (United States)
The physical properties (dielectric, ferroelectric, piezoelectric, etc.) of complex perovskite ferroelectrics depend on the degree of order/disorder and the scale of the ordered domains. In this study, the electrocaloric (EC) properties of three representative complex perovskite ferroelectrics, Pb(Mg1/3Nb2/3)O3-8PbTiO3 (PMN-8PT), 1mol% Sm-doped Pb(Mg1/3Nb2/3)O3-8PbTiO3 (1S-PMN-8PT) and Pb(Sc1/2Ta1/2)O3 (PST) are evaluated. Multi-layer ceramic capacitors (MLCCs) with identical structural configurations were fabricated for these three compounds, and their EC properties were characterized by direct measurement using a thermocouple. The EC temperature change of PMN-8PT, 1S-PMN-8PT and PST MLCCs under 20 V μm–1 at room temperature were found to be 1.42 K, 1.54 K, and 3.10 K, respectively. X-ray diffraction and high-resolution transmission electron microscopy data suggests that the high EC performance of PST is related to the ordering of B-site cations (Sc3+ and Ta5+) with the ordering parameter S = 0.82 and a long coherence length of ~100 nm, such that the sample transitioned from a relaxor ferroelectric to a normal ferroelectric. Furthermore, these results provide pathway towards design of high performance EC materials required for solid state refrigeration and air-conditioning technologies.
Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0021118
OSTI ID:
1973393
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 254; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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