✦ LIBER ✦

Electrical characterizations of PZT ceramics in large frequency and temperature ranges

✍ Scribed by D. Fasquelle; J.C. Carru

Book ID: 104022871
Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 432 KB
Volume: 28
Category: Article
ISSN: 0955-2219
DOI: 10.1016/j.jeurceramsoc.2008.01.024

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✦ Synopsis

Electrical properties of PbZr 0.75 Ti 0.25 O 3 ceramics have been characterized. The measurements have been made in frequency ranging from 20 to 2.10 9 Hz and between 20 and 730 • C for low and medium frequencies. Typically at room temperature, the dielectric constant ε is higher than 500 at 1 MHz whereas the loss tangent is close to 0.01. From ε (T) measurements, the Curie temperature of our sample has been determined at 320 • C. In the paraelectric state, ε (T) follows the empirical Curie-Weiss law near the phase transition which is of second order type. The increase of ε observed at high temperatures and low frequencies in the paraelectric state are explained: this abnormal behavior is due to the migation of oxygen ions towards the electrodes, creating an additional non-ferroelectric interface which generates a Maxwell-Wagner effect.

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