Thermodynamic study on the magnetic transition and structural phase transition in [(CH3)(2)NH2][Na0.5Fe0.5(HCOO)(3)] by using the Landau phenomenological model

Date

2020-11-01

Author

Yurtseven, Hasan Hamit

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In this study, we apply the Landau phenomenological model to describe magnetic transition and structural phase transition in a metal formate framework (MOF) of the ferromagnetic [(CH3)(2)NH2][Na0:5Fe0:5(HCOO)(3)], namely, DMNaFe. By using the observed data from the literature for the magnetization, the excess heat capacity (Delta CP), and the dielectric constant (e), we predict some thermodynamic quantities as a function of temperature close to the magnetic transition (T-M 1/4 8:5K) and structural (T-c 1/4 170:8 K) phase transition in [(CH3)(2)NH2][Na0:5Fe0:5(HCOO)(3)]. The thermodynamic quantities predicted from the Landau mean field model indicate that the multiferroics and ferromagnetic [(CH3)(2)NH2][Na0:5Fe0:5(HCOO)(3)]) undergo a weakly first order (or nearly second order) magnetic transition. Structural phase transition in [(CH3)2NH2][Na0:5Fe0:5(HCOO)(3)] is of a first order, as observed experimentally. The thermodynamic model studied here describes the observed behavior in most cases of [(CH3)(2)NH2][Na0:5Fe0:5(HCOO)(3)], and it can be applied to some other MOFs.

Subject Keywords

General Physics and Astronomy

URI

https://hdl.handle.net/11511/69744

Journal

JOURNAL OF APPLIED PHYSICS

DOI

https://doi.org/10.1063/5.0027326

Collections

Department of Physics, Article

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Citation Formats

H. H. Yurtseven, “Thermodynamic study on the magnetic transition and structural phase transition in [(CH3)(2)NH2][Na0.5Fe0.5(HCOO)(3)] by using the Landau phenomenological model,” JOURNAL OF APPLIED PHYSICS, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/69744.