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首页> 外文期刊>Journal of Applied Physics >Thermodynamic study on the magnetic transition and structural phase transition in [(CH_3)_2NH_2][Na_(0.5)Fe_(0.5)(HCOO)_3] by using the Landau phenomenological model
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Thermodynamic study on the magnetic transition and structural phase transition in [(CH_3)_2NH_2][Na_(0.5)Fe_(0.5)(HCOO)_3] by using the Landau phenomenological model

机译：通过使用Landau现象模型，[（CH_3）_2NH_2] [（CH_3）_2NH_2] [NA_（0.5）FE_（0.5）（HCOO）（HCOO）_3]中的磁性转变和结构相过期的热力学研究

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摘要

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 [(CH_3)_2NH_2][Na_(0.5)Fe_(0.5)(HCOO)_3], namely, DMNaFe. By using the observed data from the literature for the magnetization, the excess heat capacity (△C_p), and the dielectric constant (ε), we predict some thermodynamic quantities as a function of temperature close to the magnetic transition (T_M = 8.5K) and structural (T_c = 170.8 K) phase transition in [(CH_3)_2NH_2][Na_(0.5)Fe_(0.5)(HCOO)_3]. The thermodynamic quantities predicted from the Landau mean field model indicate that the multiferroics and ferromagnetic [(CH_3)_2NH_2][Na_(0.5)Fe_(0.5)(HCOO)_3]) undergo a weakly first order (or nearly second order) magnetic transition. Structural phase transition in [(CH_3)_2NH_2][Na_(0.5)Fe_(0.5)(HCOO)_3] is of a first order, as observed experimentally. The thermodynamic model studied here describes the observed behavior in most cases of [(CH_3)_2NH_2][Na_(0.5)Fe_(0.5)(HCOO)_3], and it can be applied to some other MOFs.
机译：在这项研究中，我们应用LANDAU现象模型来描述铁磁性甲酸盐框架（MOF）中的磁性转变和结构相转变[（CH_3）_2NH_2] [Na_（0.5）Fe_（0.5）（HCOO）_3]，即dmnafe。通过使用来自文献的观察到的数据来磁化，过量的热容量（△C_P）和介电常数（ε），我们预测一些热力学量作为靠近磁转换的温度（T_M = 8.5K）的函数[（CH_3）_2NH_2] [NA_（0.5）FE_（0.5）（HCOO）_3]中的相变（T_C = 170.8 k）相转变。来自LANDAU平均场模型预测的热力学量表明，多法性和铁磁[（CH_3）_2NH_2] [NA_（0.5）FE_（0.5）（0.5）（HCOO）_3]）经历弱第一阶（或几乎二阶）磁转型。如实验所观察到的，[（CH_3）_2NH_2] [（CH_3）_2NH_2] [NA_（0.5）FE_（0.5）（HCOO）_3]中的结构相转变是第一顺序的。研究的热力学模型描述了在大多数情况下观察到的行为[（ch_3）_2nh_2] [na_（0.5）fe_（0.5）（hcoo）_3]，它可以应用于其他一些mof。

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  • 来源
    《Journal of Applied Physics》 |2020年第20期|204101.1-204101.10|共10页
  • 作者

    H. Yurtseven; O.Tari;

  • 作者单位

    Department of Physics Middle East Technical University 06531 Ankara Turkey;

    Department of Mathematics and Computer Science Istanbul Arel University 34537 Bueyuekcekmece Istanbul Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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