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Structure and Unusual Magnetic Properties of Mg-Containing Solid Solutions Based on Y2FeTaO7.
- Source :
- Russian Journal of Inorganic Chemistry; Oct2023, Vol. 68 Issue 10, p1325-1333, 9p
- Publication Year :
- 2023
-
Abstract
- Mg-containing solid solutions based on Y<subscript>2</subscript>FeTaO<subscript>7</subscript> and formed by various mechanisms of heterovalent substitution were synthesized and had the following compositions: Y<subscript>2</subscript>Fe<subscript>0.55</subscript>Mg<subscript>0.3</subscript>Ta<subscript>1.15</subscript>O<subscript>7</subscript>, Y<subscript>2</subscript>Fe<subscript>0.625</subscript>Mg<subscript>0.3</subscript>Ta<subscript>1.075</subscript>O<subscript>7</subscript>, Y<subscript>2</subscript>Fe<subscript>0.7</subscript>Mg<subscript>0.3</subscript>TaO<subscript>7</subscript>, Y<subscript>2</subscript>Fe<subscript>0.7</subscript>Mg<subscript>0.2</subscript>Ta<subscript>1.1</subscript>O<subscript>7</subscript>, Y<subscript>2</subscript>Fe<subscript>0.85</subscript>Mg<subscript>0.15</subscript>TaO<subscript>7</subscript>, Y<subscript>1.85</subscript>Mg<subscript>0.15</subscript>Fe<subscript>0.925</subscript>Ta<subscript>1.075</subscript>O<subscript>7</subscript>, and Y<subscript>1.85</subscript>Mg<subscript>0.15</subscript>FeTaO<subscript>7</subscript>. It was shown that all synthesized solid solutions have a pyrochlore-like layered structure (space group P3<subscript>1</subscript>21), in which Fe<superscript>3+</superscript> ions are distributed over three structural positions. The magnetic properties of these solid solutions are due to the presence of a small ferromagnetic component in a predominantly antiferromagnetic system and characterize a ferrimagnet or a canted antiferromagnet with the Néel transition at the Néel temperature T<subscript>N</subscript> above room temperature. According to the data of magnetic measurements, two magnetic phase transitions to the ordered phase occur in all the studied samples. Along with the T<subscript>N</subscript> transition, in weak magnetic fields and below T<subscript>N</subscript>, there is a second transition, which is most likely due to a spin reorientation of the Morin type. The existence of magnetic ordering at room temperature in one magnetic sublattice or an internal magnetic field (H<subscript>in</subscript>) was confirmed by Mössbauer spectroscopy. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00360236
- Volume :
- 68
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Russian Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 174267472
- Full Text :
- https://doi.org/10.1134/S0036023623601599