Thermophysical properties of BiFeO3, Bi0.91Nd0.09FeO3, and BiFe0.91Mn0.09O3 multiferroics at high temperatures

Abstract

The thermal diffusion, heat capacity, and thermal conductivity of BiFeO 3 , Bi 0.91 Nd 0.09 FeO 3 , and BiFe 0.91 Mn 0.09 O 3 multiferroics have been studied at high temperatures (300-1120 K). The dominant mechanisms of phonon transfer in the regions of the antiferromagnetic and ferroelectric phase transitions have been determined. The temperature dependence of the mean free path of phonons has been found.

Observation of quasi-elastic light scattering in BiFeO3

“…[4][5][6][7][8][9] In addition to the phonons and magnons that reflect the dynamics of the crystal and magnetic structure, BFO exhibits electromagnons, which originate from the spin-lattice coupling. 10,11) These distinctive structures and dynamics have been studied via various experimental methods, such as neutron scattering and diffraction, 5,[12][13][14][15] X-ray diffraction, [16][17][18] specific heat measurement, [19][20][21] NMR, 22,23) terahertz spectroscopy, [24][25][26] pump-probe spectroscopy, 27) and first-principles calculations. [28][29][30] In particular, there have been many reports of Raman spectroscopy 10,11,[31][32][33][34][35][36][37][38] with measuring phonons and magnons.…”

Influence of the La3+, Eu3+, and Er3+ Doping on Structural, Optical, and Electrical Properties of BiFeO3 Nanoparticles Synthesized by Microwave-Assisted Solution Combustion Method

“…Bismuth ferrite BiFeO 3 (BFO) is a multiferroic material, which combines ferroelectricity and ferromagnetism in the same phase and has attracted great attention due to its potential applications in multifunctional devices, such as data storage systems, spintronics, and microelectronics [1][2][3][4]. Among a few known single-phase multiferroics, BFO is distinguished by its high temperature electrical and magnetic ordering (i.e., Curie temperature T C = 810 -830°C [5] and Neel temperature T N = 370°C [6]). Because of these features and good optical properties [7,8], pure and doped BFO are considered highly promising candidates for practical applications in next-generation smart materials.…”