Mӧssbauer and dielectric studies of Bi0.6Nd0.4Fe0.5M0.5O3 (M – Mn, Cr) solid solution ceramics fabricated by a high-pressure synthesis.

Authors :: Raevski, I. P.
Kubrin, S. P.
Pushkarev, A. V.
Olekhnovich, N. M.
Radyush, Yu. V.
Raevskaya, S. I.
Titov, V. V.
Malitskaya, M. A.
Shishkina, P. A.
Kolosov, S. I.
Source :: Ferroelectrics; 2024, Vol. 618 Issue 6, p1446-1453, 8p
Publication Year :: 2024
Abstract: Bi<subscript>0.6</subscript>Nd<subscript>0.4</subscript>Fe<subscript>0.5</subscript>M<subscript>0.5</subscript>O<subscript>3</subscript> (M – Mn, Cr) compositions with perovskite structure were fabricated by a high-pressure synthesis. Mӧssbauer studies have shown that doping with Nd does not change substantially Neel temperature values of Bi<subscript>0.6</subscript>Nd<subscript>0.4</subscript> Fe<subscript>0.5</subscript>M<subscript>0.5</subscript>O<subscript>3</subscript> (M – Cr, Mn) compositions. However, the Fe<superscript>3+</superscript> and Mn<superscript>3+</superscript> ions seem to be inhomogeneously distributed in the crystal lattice and form Fe-poor and Fe-rich regions. Similar result was obtained by us earlier for Bi(Fe<subscript>1-x</subscript>Cr<subscript>x</subscript>)O<subscript>3</subscript> solid solution. Both compositions studied exhibit a giant dielectric response in a wide temperature range. The giant dielectric response seems to be due to the relaxation of electrons or polarons trapped by oxygen vacancies. [ABSTRACT FROM AUTHOR]

Subjects :: SOLID solutions
CRYSTAL lattices
ELECTRON traps
PHASE transitions
PEROVSKITE

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