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This study investigates the influence of applied electric field frequency for polarization–electric field (P–E) loops on indirect electrocaloric evaluation. Soft lead zirconate titanate (PZT) ceramic is used as a model material. The P–E loops under 1 and 100 Hz are presented at various temperatures with an electric field amplitude of 2.5 MV m−1. The indirect method based on the Maxwell relations...
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