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首页> 外文期刊>Journal of materials science >Spectroscopic, optical, magnetic and dielectric investigation of the orthoborate Ba_2Co(BO_3)_2 nanopowder
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Spectroscopic, optical, magnetic and dielectric investigation of the orthoborate Ba_2Co(BO_3)_2 nanopowder

机译：正交性Ba_2CO（BO_3）_2纳米粉末的光谱，光学，磁性和介电研究

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摘要

Nano-polycrystalline phase of Ba_2Co(BO_3)_2, has been successfully obtained by the standard solid-state reaction. The Ba_2Co(BO_3)_2 crystallizes in the monoclinic cell with the space group C2/m. The cell parameters are: a= 12.027 A, b = 5.340 A, c - 10.295 A, and β= 117.228°. The average grain size determined from Debye-Scherer's equation is 40.29 nm. The surface morphology of the studied borate is consisting of the regular-shaped particles and the SEM reveals homogenous particles of nanotubes shapes. The elemental composition is confirmed by Energy Dispersive Spectrometry (EDS). The infrared and Raman studies confirm the existence of the BO_3 groups. The calculated gap energy (E=3.57 eV for the indirect mode and E = 3.9 eV for the direct one) is reported which is typical for wide-band-gap semiconductor materials. The magnetic measurements established that the predominant interactions in this borate are antiferromagnetic. The thermal investigation of the borate studied by the differential scanning calorimetry (DSC) highlights several anomalies, which could correspond either to phase transitions or to change in the physical behavior of the material. These phenomena are observed and interpreted by means of the dielectric study at high temperature.
机译：通过标准固态反应成功地获得了Ba_2CO（BO_3）_2的纳米多晶相。 BA_2CO（BO_3）_2在单斜晶体中结晶，具有空间组C2 / m。电池参数是：a = 12.027a，b = 5.340a，c-10.295a，β= 117.228°。从Debye-Scherer等式确定的平均晶粒尺寸为40.29nm。所研究的硼酸盐的表面形态由常规形状的颗粒组成，SEM显示纳米管形状的均匀颗粒。通过能量分散光谱（EDS）确认元素组合物。红外和拉曼研究证实了BO_3组的存在。报告了计算出的间隙能量（E = 3.57eV用于间接模式，直接e = 3.9eV），这对于宽带间隙半导体材料是典型的。磁测量结果确定了这种硼酸盐中的主要相互作用是反铁磁。通过差示扫描量热法（DSC）研究的硼酸盐的热调查突出了几个异常，其可以对应于相位过渡或改变材料的物理行为。通过高温下的介电研究观察和解释这些现象。

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  • 来源
    《Journal of materials science》 |2020年第19期|16678-16687|共10页
  • 作者

    F.-E. Nfaoui; M. Taibi; J. Aride; A. Boukhari; H. Saadaoui; M. Rouzieres;

  • 作者单位

    Centre Sciences des Materiaux Laboratoire de Physico-Chimie des Materiaux Inorganiques et Organiques (LPCMIO). Ecole Normale Superieure (E.N.S) Mohammed V University in Rabat Rabat Morocco;

    Centre Sciences des Materiaux Laboratoire de Physico-Chimie des Materiaux Inorganiques et Organiques (LPCMIO). Ecole Normale Superieure (E.N.S) Mohammed V University in Rabat Rabat Morocco;

    Centre Sciences des Materiaux Laboratoire de Physico-Chimie des Materiaux Inorganiques et Organiques (LPCMIO). Ecole Normale Superieure (E.N.S) Mohammed V University in Rabat Rabat Morocco;

    Laboratoire de Chimie Appliquee des Materiaux Centre des Sciences des Materiaux Faculty of Sciences Mohammed V University in Rabat Avenue Ibn Batouta BP 1014. Rabat Morocco;

    Centre de Recherche Paul Pascal CRPP-CNRS UPR 8641 Research Team for "Molecular Materials & Magnetism 115 Avenue du Dr A. Schweitzer 33600 Pessac France;

    Centre de Recherche Paul Pascal CRPP-CNRS UPR 8641 Research Team for "Molecular Materials & Magnetism 115 Avenue du Dr A. Schweitzer 33600 Pessac France;

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