Electrical and Ferroelectric Properties of Undoped and Er-Doped PZT52/48 Electroceramics Synthesized by a Polymeric Precursor Method

Caceres, Jaime Alberto Sanchez; Passos, C. A. C.

doi:10.1590/1980-5373-mr-2020-0538

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Dielectric Anomaly: Semi-quantitative Correlation1

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2023

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“…In particular, the values obtained for ΔE are agreement with the results of the literature for PZT-based ceramics involving processes of conduction by oxygen vacancies (acting as charge carriers) [25][26][27][28][29][30] . These values show to be higher for the grain boundaries in relation to the grains, indicating that the first region is relatively more resistive in relation to the second.…”

Section: Dielectric Anomaly: Semi-quantitative Correlationsupporting

confidence: 88%

Dielectric Anomaly Origin Study for Ferroelectric Ceramic of Type PZT52/48 Erbium-doped at High-temperatures

Caceres,

Passos

2023

Mat. Res.

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In present work, erbium-doped PZT 52/48 ceramics at sites A and B were prepared by the Pechini method in order to study their dielectric properties. The aim was investigated the dielectric anomalies of interfacial origin in these ferroelectrics. The ceramics were also submitted to electrical measurement analysis. The dielectric response of the grains showed characteristics of materials that follow Curie-Weiss law which is typical of ferroelectrics. In high temperatures and low frequencies, it was detected the dielectric anomaly phenomenon for the ceramic samples. Impedance spectroscopy analyzes through equivalent circuit (brick-layer model), grain and grain boundary in series, exposed a predominance of dielectric properties of intergranular interfaces as the cause of this anomaly. The electrical characterization showed a peculiar ferroelectric-paraelectric phase transition around 390 °C for both samples.

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