Volume 102, Number 1, April 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 April 2013|
Diffuse critical point in PLZT ceramics
1 Institute Jožef Stefan - Jamova 39, 1000 Ljubljana, Slovenia, EU
2 Jožef Stefan International Postgraduate School - Jamova 39, 1000 Ljubljana, Slovenia, EU
3 Centre of Excellence NAMASTE - Jamova 39, 1000 Ljubljana, Slovenia, EU
Received: 19 March 2013
Accepted: 21 March 2013
The ferroelectric transition line in the electric-field temperature phase diagram of the canonical relaxor ferroelectric ceramics 9/65/35 PLZT has been studied via polarization and high-resolution heat capacity measurements. The modified calorimetric relaxation measurements show a change of the sample temperature if the applied electric field is sufficiently high to induce a ferroelectric transition. The anomaly in the sample temperature is a consequence of the released excess heat, i.e., latent heat at the transition from the disordered dipolar glass state to the long-range–ordered ferroelectric state. The presence of latent heat supports the well-established physical picture of relaxors according to the so-called dipolar glass scenario. Furthermore, it was found that latent heat decreases with increasing temperature, indicating the existence of a diffuse-type critical point.
PACS: 77.80.Jk – Relaxor ferroelectrics / Relaxor ferroelectrics – / 05.70.Jk – / Critical point phenomena – / 65.40.Ba – / Heat capacity –
© EPLA, 2013
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