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Registration Number

0222U004610, 0117U002460 , R & D reports

Title

Development of methods of synthesis, manufacturing technology and research of oxide multiferroics based on ceramic solid solutions and multilayer composite structures to create multifunctional magnetoelectric materials of new generation with high properties and operational resource

Head

Glynchuk Maya D, Доктор фізико-математичних наук

Registration Date

19-09-2022

Organization

Institute of Problems of Materials Science named after IM Frantsevich of the National Academy of Sciences of Ukraine

Description

 The object of the study were multiferoics based on solid solutions x(PbFe1/2Ta1/2O3,PbFe1/2Nb1/2O3)–(1-x)PbZr1/2Ti1/2O3, EuTiO3 and composites containing Mn. In contrast to traditional methods, the method of pulse heating of oxide precursor mixtures was used, which allowed the synthesis of initial precursors of solid solutions with a crystallite size of 20–70 nm at temperatures of 750–950 oC. In PCN - PZT, PMN - PZT systems, higher oxides of Cr and Mn make it difficult or impossible to obtain single-phase perovskite solid solutions in air. However, when sintering in an oxygen-free argon medium, the formation of continuous series of solid solutions with a perovskite structure was established for the first time, and ceramic materials based on them with high electrical resistance (106 Ohms and more) were obtained. The influence of oxygen vacancies on relaxors with a perovskite structure is considered in the framework of the Landau-Ginzburg-Devonshire phenomenological theory. The main focus is on the PZN-PLZT relaxor. It is shown that the negative Curie temperature TC* of the relaxor is renormalized by elastic dipoles due to the influence of electrostriction and can become positive at a sufficiently high concentration of vacancies, ie to induce the ferroelectric phase. Magnetic and dielectric measurements of composite ceramics of multipheroics containing Mn ions were performed. An increase in the residual magnetization, saturation magnetization, as well as an increase in the dielectric constant with increasing manganese content is shown. Theoretical modeling and experimental study of the magnetoelectric effect (ME) in nanograin ceramics of PFN-PZT and PFT-PZT multiferroic perovskites, which have a high ME effect at room temperature, were performed.

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Eliseev Evgen A
Zagorodniy Yuriy О
Kondakova Irina V
Krychynska Vira O
Kuzian Roman O
Likhtin Andrіy E
Laguta Valentyn V
Leshchenko Oksana V
Pavlikov Viktor М
Pleskach Igor V
Roginets Nadia V
Stratiev Victor G
Umpeleva Elizaveta D
Ushakov Oleksandr M
Yurchenko Lesia P