Imperial College London

ProfessorNeilAlford

Central FacultyOffice of the Provost

Associate Provost (Academic Planning)
 
 
 
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Contact

 

+44 (0)20 7594 6724n.alford

 
 
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Assistant

 

Miss Catherine Graham +44 (0)20 7594 3330

 
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Location

 

2..05 (in RSM) or 3.09 (in the Faculty Building)Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Sanlialp:2016:10.1111/jace.14456,
author = {Sanlialp, M and Shvartsman, VV and Acosta, M and Lupascu, DC},
doi = {10.1111/jace.14456},
journal = {Journal of the American Ceramic Society},
pages = {4022--4030},
title = {Electrocaloric Effect in Ba(Zr,Ti)O<inf>3</inf>–(Ba,Ca)TiO<inf>3</inf> Ceramics Measured Directly},
url = {http://dx.doi.org/10.1111/jace.14456},
volume = {99},
year = {2016}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - © 2016 The American Ceramic Society In this paper, we report on studies of the electrocaloric (EC) effect in lead-free (1−x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 ceramics with compositions range between 0.32 ≤ x ≤ 0.45. The EC effect was measured directly using a modified differential scanning calorimeter. The maximum EC temperature change, ΔTdirect = 0.33 K under an electric field of 2 kV/mm, was observed for the composition with x = 0.32 at ~63°C. We found that the EC effect peaks not only around the Curie temperature but also at the transition between the ferroelectric phases with different symmetries. A strong discrepancy observed between the results of the direct measurements and indirect estimations points out that using Maxwell's equations is invalid for the thermodynamic nonequilibrium conditions that accompany only partial (incomplete) poling of ceramics. We also observe a nonlinearity of the EC effect above the Curie temperature and in the temperature range corresponding to the tetragonal ferroelectric phase.
AU - Sanlialp,M
AU - Shvartsman,VV
AU - Acosta,M
AU - Lupascu,DC
DO - 10.1111/jace.14456
EP - 4030
PY - 2016///
SN - 0002-7820
SP - 4022
TI - Electrocaloric Effect in Ba(Zr,Ti)O<inf>3</inf>–(Ba,Ca)TiO<inf>3</inf> Ceramics Measured Directly
T2 - Journal of the American Ceramic Society
UR - http://dx.doi.org/10.1111/jace.14456
VL - 99
ER -