Low-frequency internal friction study of phase transitions in La1/3Sr2/3FeO3−δ ceramics

Investigation on the low-frequency mechanical properties of La0.6Sr0.4Co1−xFexO3−δ materials

“…Thus these domain walls become immobile. This freezing of the domain walls is anelastic and would lead to the pronounced resonance peak [20,21]. This phenomenon is very similar to those of LaAlO 3 [30] and Ca 1−x Sr x TiO 3 [31] reported by Harrison. In fact, in the LaCoO 3 -based perovskites, different types of domains have been confirmed by the in situ TEM measurement, such as short parallel domains oriented at 180 • to each other and long domains [14].…”

“…The combination of structure changes and the appearance of transformation twins result in a rapid softening in modulus even in small applied forces. Lowfrequency internal friction measurement on La 1−x Sr x FeO 3 has demonstrated this point [20,21]. The inelastic deformation of LaCo(Fe)O 3 based perovskites may associated with the structure phase transition and the appearance of transformation twins.…”

“…As a systematic tool, the internal friction technique has been proven to be particularly successful in investigating the microscopic relaxation processes and phase transitions in solid materials [20][21][22][23][24][25]. To gain more insight into the microscopic origin of the inelasticity and phase transition in LaCoO 3 -based materials, the low-frequency mechanical properties of La 0.6 Sr 0.4 Co 1−x Fe x O 3−ı (0 ≤ x ≤ 0.8) are investigated in this paper.…”

Origin of spin-glass and exchange bias in La1∕3Sr2∕3FeO3−γ nanoparticles

“…This behaviour has been interpreted as due to a deficiency in the oxygen content, which becomes even more important in the samples with the smallest average particle sizes. 27,28 The morphology, the nanometric nature, and the particle size distribution of the calcined samples were investigated by SEM and the results are shown in Fig. 2.…”

Dynamic Mechanical and Electric Behaviors of La-Doped BiVO4

“…The mechanical and electrical relaxation techniques can provide valuable information about the kinetic properties, phase transition, structure change, defect state, etc. − The internal friction (IF) technology is a nondestructive and sensitive approach to evaluate the defect state. And impedance spectroscopy has been well applied to study the activation energy and electrical conductivity. , On the other hand, La 3+ ions have a similar ionic radius and the same valence state in comparison with Bi 3+ ions, which benefits the systematical investigations to reveal the physical nature of BiVO 4 -based material.…”