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Study of magnetic and thermal properties of SmCrO3 polycrystallites

机译:SMCRO3多晶硅磁性和热性能研究

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摘要

In the present work, we have studied the magnetic and thermal properties of sol gel derived samarium chromite (SCO) polycrystallites. The magnetic measurements of SCO polycrystallites show a characteristic antiferromagnetic transition T-N similar to 190 K and spin reorientation temperature T-SR similar to 33 K, which is in the region of interest to study a possible magnetocaloric effect (MCE). The isothermal magnetic entropy change (Delta S-M) is estimated by an indirect method from the isothermal magnetization curves measured in this temperature range. The SCO polycrystallites possesses both inverse (positive) and normal (negative) MCE at and above around the spin reorientation transition (TSR) with Delta S-M(max) M values of similar to -24 x 10(-2) & 13 x 10(-2) J kg(-1) K-1, respectively. The SCO also shows another normal (negative) MCE peak around its Neel transition (T-N) with -Delta S-M(max) M similar to 11 x 10(-2) J kg(-1) K-1. The presence of two successive MCE peaks in SCO in the temperature range of 3-50 K, leads to an similar to 47 K operating temperature window with one thermodynamic cycle. In addition, the low temperature heat capacity (C-P) measurements of SCO polycrystallites reveal a lambda-shaped peak at T-N which is associated with a conventional second- order, paramagnetic to antiferromagnetic (AFM), phase transition. The temperature and magnetic field dependence of the specific heat capacity was studied and analyzed to estimate the adiabatic temperature change (Delta T-ad). In addition the C-P vs. T curve in SCO also shows a weak anomaly around the similar to T-SR along with a Schottky anomaly below 10 K.
机译:在本作工作中,我们研究了溶胶凝胶衍生的钐铬铁矿(SCO)多晶体的磁性和热性能。 SCO多晶硅的磁测量结果显示了类似于190 k和自旋重新定向温度T-Sr的特征反铁磁性转变T-N,其类似于33k,其在感兴趣的区域中研究可能的磁热效应(MCE)。等温磁熵变化(Delta S-M)由在该温度范围内测量的等温磁化曲线的间接方法估计。 SCO多晶硅在旋转重新定向过渡(TSR)周围具有逆(阳性)和正常(负)MCE,其具有与-24×10(-2)和13×10相似的Delta SM(MAX)M值( -2)分别为J kg(-1)k-1。 SCO还显示出围绕其NEER转变(T-N)的另一个正常(阴性)MCE峰(T-N),其与11×10(-2)j kg(-1)k-1相似的-delta s-m(max)m。在3-50 k的温度范围内的两个连续MCE峰值的存在导致与47K工作温度窗口相似,具有一个热力学循环。此外,SCO多晶的低温热容量(C-P)测量结果显示在T-N处的λ形峰值,其与传统的第二顺序与反铁磁(AFM),相转变相关联。研究并分析了比热容量的温度和磁场依赖性,以估计绝热温度变化(Delta T-Ad)。此外,SCO中的C-P对T曲线还显示出与T-SR相似的弱异常,以及低于10k的肖特基异常。

著录项

  • 来源
    《RSC Advances》 |2016年第85期|共10页
  • 作者

    Gupta Preeti; Poddar Pankaj;

  • 作者单位

    CSIR Natl Chem Lab Phys &

    Mat Chem Div Dr Homi Bhabha Rd Pune 411008 Maharashtra India;

    CSIR Natl Chem Lab Phys &

    Mat Chem Div Dr Homi Bhabha Rd Pune 411008 Maharashtra India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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