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Important variation in vibrational properties of LiFePO4 and FePO4 induced by magnetism

Ali Seifitokaldani, Aïmen E. Gheribi, Anh Thu Phan, Patrice Chartrand and Mickaël Dollé

Article (2016)

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Cite this document: Seifitokaldani, A., Gheribi, A. E., Phan, A. T., Chartrand, P. & Dollé, M. (2016). Important variation in vibrational properties of LiFePO4 and FePO4 induced by magnetism. Scientific Reports, 6, p. 1-10. doi:10.1038/srep33033
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Abstract

A new thermodynamically self-consistent (TSC) method, based on the quasi-harmonic approximation (QHA), is used to obtain the Debye temperatures of LiFePO4 (LFP) and FePO4 (FP) from available experimental specific heat capacities for a wide temperature range. The calculated Debye temperatures show an interesting critical and peculiar behavior so that a steep increase in the Debye temperatures is observed by increasing the temperature. This critical behavior is fitted by the critical function and the adjusted critical temperatures are very close to the magnetic phase transition temperatures in LFP and FP. Hence, the critical behavior of the Debye temperatures is correlated with the magnetic phase transitions in these compounds. Our first-principle calculations support our conjecture that the change in electronic structures, i.e. electron density of state and electron localization function, and consequently the change in thermophysical properties due to the magnetic transition may be the reason for the observation of this peculiar behavior of the Debye temperatures.

Open Access document in PolyPublie
Subjects: 1800 Génie chimique > 1800 Génie chimique
1800 Génie chimique > 1803 Thermodynamique
Department: Département de génie chimique
Research Center: CRCT - Centre de recherche en calcul thermochimique
Funders: Conseil de recherches en sciences naturelles et en génie du Canada (CRSNG), Automotive Partnership Canada (APC) program, Fondation canadienne pour l'innovation (FCI), NanoQuébec, Réseau de médecine génétique appliquée (RMGA), Fonds de recherche du Québec--Nature et technologies
Date Deposited: 05 Dec 2018 16:57
Last Modified: 06 Dec 2018 01:20
PolyPublie URL: https://publications.polymtl.ca/3522/
Document issued by the official publisher
Journal Title: Scientific Reports (vol. 6)
Publisher: Nature Research
Official URL: https://doi.org/10.1038/srep33033

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