Structure and Unusual Magnetic Properties of Mg-Containing Solid Solutions Based on Y2FeTaO7

Mg-containing solid solutions based on Y 2 FeTaO 7 and formed by various mechanisms of heterovalent substitution were synthesized and had the following compositions: Y 2 Fe 0.55 Mg 0.3 Ta 1.15 O 7 , Y 2 Fe 0.625 Mg 0.3 Ta 1.075 O 7 , Y 2 Fe 0.7 Mg 0.3 TaO 7 , Y 2 Fe 0.7 Mg 0.2 Ta 1.1 O 7 , Y 2 Fe 0....

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2023-10, Vol.68 (10), p.1325-1333
Main Authors: Ellert, O. G., Popova, E. F., Kirdyankin, D. I., Imshennik, V. K., Kulikova, E. S., Egorysheva, A. V.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chemistry
Chemistry and Materials Science
Ferrimagnets
Ferromagnetism
Inorganic Chemistry
Magnetic fields
Magnetic measurement
Magnetic properties
Mossbauer spectroscopy
Neel temperature
Phase transitions
Room temperature
Solid solutions
Synthesis
Synthesis and Properties of Inorganic Compounds
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Summary:Mg-containing solid solutions based on Y 2 FeTaO 7 and formed by various mechanisms of heterovalent substitution were synthesized and had the following compositions: Y 2 Fe 0.55 Mg 0.3 Ta 1.15 O 7 , Y 2 Fe 0.625 Mg 0.3 Ta 1.075 O 7 , Y 2 Fe 0.7 Mg 0.3 TaO 7 , Y 2 Fe 0.7 Mg 0.2 Ta 1.1 O 7 , Y 2 Fe 0.85 Mg 0.15 TaO 7 , Y 1.85 Mg 0.15 Fe 0.925 Ta 1.075 O 7 , and Y 1.85 Mg 0.15 FeTaO 7 . It was shown that all synthesized solid solutions have a pyrochlore-like layered structure (space group P 3 1 21), in which Fe 3+ 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 N 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 N transition, in weak magnetic fields and below T N , 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 in ) was confirmed by Mössbauer spectroscopy.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023623601599