UDC 621.391, 621.396

Dielectric, thermomechanical properties and phase transitions in shape memory ceramics (Pb_0.95La_0.05)(Zr_0.65Ti_0.35)_0.9875O₃

 

V. V. Koledov ¹, V. G. Shavrov ¹, A. Peláiz-Barranco ², V.S. Kalashnikov ¹, S.V. von Gratowski ¹  

¹ Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Mokhovaya 11-7, Moscow 125009, Russia

² Ferroic Materials Group, Physics Faculty - IMRE, Havana University, San Lázaro y L, Vedado. La Habana 10400, Cuba

 

The paper is received on August 6, 2019

 

Abstract. The phase transformations in ceramic samples of (Pb_0.95La_0.05)(Zr_0.65Ti_0.35)_0.9875O₃ (PLZT) were studied by differential scanning calorimetry in the temperature range from -120 to 300 ° C, by three-point bending under constant load in the temperature range from -100 to 250 ° C and the method of measuring the dielectric constant in the temperature range from 20 to 450 ° C. It was shown that the material exhibits a second-order ferroelectric phase transition in the temperature range from 100 to 300 ° C and a first-order phase structural transition in the range from -20 to 100 ° C. The data obtained indicate that the low-temperature structural transition has features characteristic of thermoelastic martensitic transitions and is accompanied by reversible deformations during thermal cycling under mechanical load. The possibility of observing the shape memory effect (SME) under the influence of changes in temperature and electric field in ceramics of a given composition is discussed.

Key words: phase transitions, shape memory effect, thermoelastic martensitic transformation, lead-titanium-zirconium ceramics.

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For citation:

V. V. Koledov, V. G. Shavrov, A. Peláiz-Barranco, V. S. Kalashnikov, S. V. von Gratowski. Dielectric, thermomechanical properties and phase transitions in shape memory ceramics (Pb_0.95La_0.05)(Zr_0.65Ti_0.35)_0.9875O₃. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 8. Available at http://jre.cplire.ru/jre/aug19/6/text.pdf

DOI  10.30898/1684-1719.2019.8.6