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通过溶胶-凝胶自燃技术合成的LaSrMnO纳米颗粒的结构、热学和输运性质。

Structural, thermal, and transport properties of LaSrMnO nanoparticles synthesized the sol-gel auto-combustion technique.

作者信息

Saleem M, Varshney Dinesh

机构信息

Materials Science Laboratory, School of Physics, Devi Ahilya University Vigyan Bhavan, Khandwa Road Campus Indore 452001 India

出版信息

RSC Adv. 2018 Jan 4;8(3):1600-1609. doi: 10.1039/c7ra09883a. eCollection 2018 Jan 2.

DOI:10.1039/c7ra09883a
PMID:35540891
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9077035/
Abstract

Herein, rare-earth manganite, LaSrMnO, has been prepared by a citric acid-assisted sol-gel auto-combustion method at a maintained pH value of 11. Room-temperature X-ray diffraction (RT-XRD) data analysis revealed a rhombohedral structure for the sample with the space group 3, which was further confirmed by synchrotron radiation X-ray diffraction (SR-XRD). Rietveld refinement was carried out for both spectra, which confirmed the SR-XRD and RT-XRD results and the various structural parameters. To determine any of the phase transitions in the sample, temperature-dependent X-ray diffraction corresponding to the temperatures of 100 K, 200 K, 250 K, and 325 K was carried out, and no new phase was found. Temperature-dependent Raman characterization confirmed the metallic phase of the sample with the reduced Jahn-Teller distortion. Scanning electron microscopy confirmed the growth in the grain size as a result of a high sintering temperature. Compositional verification was conducted using energy-dispersive analysis of X-ray diffraction (EDAX). Low-temperature dc resistivity measurement showed a metal-insulator transition temperature ( ) of ≈178 K. The DSC-specific heat measurement shows the ferromagnetic metallic nature where heat capacity increases with an increase in temperature.

摘要

在此，通过柠檬酸辅助溶胶 - 凝胶自燃法在pH值保持为11的条件下制备了稀土锰酸盐LaSrMnO。室温X射线衍射（RT - XRD）数据分析表明，该样品具有菱面体结构，空间群为3，同步辐射X射线衍射（SR - XRD）进一步证实了这一点。对两种光谱进行了Rietveld精修，证实了SR - XRD和RT - XRD结果以及各种结构参数。为了确定样品中的任何相变，进行了对应于100 K、200 K、250 K和325 K温度的变温X射线衍射，未发现新相。变温拉曼表征证实了样品的金属相具有降低的 Jahn - Teller 畸变。扫描电子显微镜证实了由于高烧结温度导致晶粒尺寸增大。使用X射线衍射能谱分析（EDAX）进行了成分验证。低温直流电阻率测量显示金属 - 绝缘体转变温度（ ）约为178 K。差示扫描量热法比热测量显示出铁磁金属性质，其中热容量随温度升高而增加。

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