Phonon properties of multiferroic BiFeO3

Publication date: December 2019Source: Materials Science and Engineering: B, Volume 251Author(s): Xian-Sheng CaoAbstractThe phonon properties of BiFeO3 have been studied by using the specific heat. It is found that the specific heat of BiFeO3 exhibits two peaks. The first peak appears at the magnetic phase transition temperature TN = 650 K. This anomaly in specific heat can be interpreted as antiferromagnetic transition. The values of the specific heat (at the magnetic phase transition temperature TN) increase with the increasing of the J1, |J2|, I and g. Another abnormal peak of specific heat appears at nearly 550 K, which is associated with the onset of structural changes. Note that the second peak shifts to lower temperature as the J1, |J2|, I and g decrease. It is considered that the main reason of leading to the structure distortion increases is due to the increase of the J1, |J2|, I and g. Those calculation conclusions are in accordance with the experimental results of other researchers.
Source: Materials Science and Engineering: B - Category: Materials Science Source Type: research