The effect of mechanical activation on dielectric properties of ceramic ferroelectrics-relaxors PbMg_1/3Nb_2/3O₃ and PbFe_1/2Ta_1/2O₃

ABSTRACT

High-energy mechanical activation of the starting oxides was found to reduce dramatically or even suppress the frequency shift of the dielectric permittivity maximum of ceramic ferroelectrics-relaxors PbMg_1/3Nb_2/3O₃ and PbFe_1/2Ta_1/2O₃ sintered from the mixture of these oxides. At the same time, the value of permittivity maximum does not change substantially. On increase of the sintering temperature above ≈1100°C for PbFe_1/2Ta_1/2O₃ and ≈1200°C for PbMg_1/3Nb_2/3O₃ the effect of mechanical activation on dielectric properties of both these ceramics gradually vanishes.

KEYWORDS:

• PMN
• PFT
• dielectric response
• relaxor
• mechanical activation

Acknowledgments

This study was partially supported by the Russian Foundation for Basic Research (project 17–03–01293_a), Ministry of education and science of the Russian Federation (research project 3.1649.2017/4.6) and Research Committee of the University of Macau (Research & Development Grant for Chair Professor No RDG007/FST-CHD/2012).

Additional information

Funding

This work was supported by the Russian Foundation for Basic Research (17-03-01293_a), Research Committee of the University of Macau (RDG007/FST-CHD/2012.), and Ministry of education and science of the Russian Federation (3.1649.2017/4.6).