Electron microscopy, X-Ray diffraction and Mossbauer studies of PbFe0.5Nb0.5O3, PbFe0.5Ta0.5O3 and BaFe0.5Nb0.5O3 ceramics sintered from mechanoactivated nanopowders

• Published in: Ferroelectrics Vol. 496; no. 1; pp. 231 - 239
• Main Authors: Gusev, A. A., Raevskaya, S. I., Titov, V. V., Isupov, V. P., Avvakumov, E. G., Raevski, I. P., Chen, H., Chou, C.-C., Kubrin, S. P., Titov, S. V., Malitskaya, M. A., Sarychev, D. A., Stashenko, V. V., Shevtsova, S. I.
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 27-05-2016; Taylor & Francis Ltd
• Subjects: Ceramics; Diffraction; Fe spectra; Iron-containing perovskites; mechanical activation; Microscopy; Mossbauer; Perovskite; phase transition; Phase transitions; Sintering
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150193.2016.1157742

The effect of high-energy mechanical activation on magnetic phase transition temperature T
M
of PbFe
0.5
Nb
0.5
O
3
, PbFe
0.5
Ta
0.5
O
3
, and BaFe
0.5
Nb
0.5
O
3
perovskites has been studied. Mossbauer studies have shown that T
M
values in all the perovskites studied can be changed substantially by mechanical activation and subsequent annealing. The increase of T
M
by 40-50 K, as compared to corresponding single crystals and ceramics sintered from the non-activated powders, was achieved in the mechanoactivated powders of both lead-containing and lead-free perovskites studied.