1. Shubnikov Institute of Crystallography of FSRC “Crystallography and Photonics” RAS
2. Kirensky Institute of Physics Siberian Branch of Russian Academy of Sciences
折叠
Abstract
? 2022 Elsevier B.V.The results of studies of the NdFe3(BO3)4 by 57Fe Mossbauer spectroscopy in comparison with the data of single crystal X-ray diffraction measurements are presented. Scanning of the crystal cell parameters in a wide temperature range T = 15–500 K revealed a negative thermal expansion along the c axis and structural anomalies. The temperature dependences of the M?ssbauer parameters of hyperfine interaction in the paramagnetic state of NdFe3(BO3)4 correlate well with the behavior of crystal cell parameters obtained by X-ray diffraction data. The temperature of the magnetic phase transition TN = 32.54(4) K is established, below which the iron ions form a 3D magnetic order of the Izing type. The magnetic transition of the iron subsystem from a commensurate to an incommensurate structure at a temperature of about T ≈ 15 K is discussed. The “M?ssbauer” Debye temperature ΘM was estimated to be 485(2) K.
Key words
Commensurate and incommensurate magnetic structures/Magnetic phase transition/Multiferroics/M?ssbauer spectroscopy/Rare earth - iron compounds/X-ray diffraction
NSTL
Elsevier