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Influence of cerium ions on structure-dependent magnetic properties of ba-Sr M-type hexaferrite nanocrystals

Journal of Rare Earths 2024年第2期42卷 364-372,I0005页

作者： Ram A.Pawar Sunil M.Patange P.M.Dighe sher Singh Meena Abdullah GAl-Sehemi Mehboobali Pannipara Santosh S.Jadhav Department of Physics ArtsCommerce and Science CollegeAhmednagar413711MaharashtraIndia Department of Physics Shri Krishna MahavidyalayaGunjotiDistOsmanabad413606MaharashtraIndia Padmashri Vikhe Patil College of Arts Science and CommercePravaranagarA/P.Loni(Kd)Tal.RahataDistAhmednagar413713MaharashtraIndia Solid State Physics Division Bhabha Atomic Research CentreMumbai400085MaharashtraIndia Department of Chemistry King Khalid UniversityAbha61413Saudi Arabia Department of Physics D.S.M's ArtsCommerce and Science CollegeJintur431509MaharashtraIndia

The present study is a systematic effort to investigate the structure-sensitive magnetic parameters of Ce^(3+) substituted ba-Sr hexaferrite nanocrystals chemically formulated as ba_(0.5)Sr_(0.5)Ce_(x)Fe_(12-x)O_(19) where x=0.0-0.2 with Δx=*** hexaferrite powders were prepared using the sol-gel self-ignition route and structurally characterized by means of powder X-ray diffraction and Fourier transform infrared *** creation of the M-type hexaferrite phase within the synthesized samples was revealed from the Rietveld refinement of the X-ray *** occurrence of a secondary phase of CeO_(2) was revealed within the hexaferrites for the substitution,x> *** refined X-ray diffraction data were utilized to compute the lattice parameters,X-ray density,and lattice parameter *** crystal structure plotted from the refined XRD data reveals the occupancy of the ions at different lattice *** XPS data of the hexaferrite were analyzed to confirm the oxidation states of the constituent *** nanocrystalline nature of the hexaferrites was revealed from the crystallite sizes calculated using Scherer's *** analysis of FTIR spectra confirms that only a fraction of Ce^(3+)accommodated in the lattice and the remaining Ce content reside in the form of the CeO_(2) *** morphology of the hexaferrites was analyzed from the FESEM profiles of the ferrite *** magnetic behavior study was performed by analyzing the Curie temperature,hysteresis loops,and hyperfine interactions by means of susceptibility,V.S.M,and Mossbauer spectroscopy,*** hexaferrites with increasing coercivity,decreasing saturation magnetization,and decreasing Curie temperature are reported in the *** substituted Ce^(3+)ions inhibit the grain growth and create lattice imperfections giving rise to hexaferrites with tuned magnetic parameters suitable for different applications.

关键词： ba-Sr hexaferrite Ce^(3+)substitution XPS Saturation magnetization Coercivity M?ssbauer spectroscopy

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西藏山南吉如寺藏写卷《大般若经》题记考证

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攀登（藏文版） 2024年第1期 45-57页

作者：达娃次仁西藏大学文学院

西藏山南吉如寺保存的写卷是近年来在西藏境内发现的重要藏文古籍文献。一经发现被国内外藏学界高度重视,相关研究报告层出不穷。特别是题记中出现的编校者关于“喇嘛尚”的考证,就目前而言,国内外藏学界公认为“喇嘛尚”是蔡巴噶举派... 详细信息

西藏山南吉如寺保存的写卷是近年来在西藏境内发现的重要藏文古籍文献。一经发现被国内外藏学界高度重视,相关研究报告层出不穷。特别是题记中出现的编校者关于“喇嘛尚”的考证,就目前而言,国内外藏学界公认为“喇嘛尚”是蔡巴噶举派创始人“公堂喇嘛尚·尊珠扎巴”。此问题不仅关系到编校者的确切身份,而且也直接影响到该文献的成书年代。对此,作者基于前人研究和查阅大量相关文献资料及多次实地调研的基础上,提出吉如寺现存三部《大般若经》题记中出现的编校者“喇嘛尚”应系12世纪初出生于当地的著名“喇嘛尚·松托巴”大师,而非“公堂喇嘛尚·尊珠扎巴”,并对“喇嘛尚·松托巴”的生平作了简要介绍,以便抛砖引玉,推动这一问题的研究。

关键词：吉如寺大般若经题记喇嘛尚

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Geodynamic background of Intracontinental Cenozoic Alkaline Volcanic Rocks in Laojiezi, Western Yangtze Craton: Constraints from Sr-Nd-Hf-O Isotopes

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2098-2119页

作者： YAN Qinggao JIANG Xiaojun LI Chao ZHOU Limin WANG Zhongqiang Sultan baig sher QU Wenjun DU ANDao Department of Earth Sciences Faculty of Land Resource EngineeringKunming University of Science and Technology Beijing SHRIMP Center Chinese Academy of Geological Sciences National Research Center for Geoanalysis Chinese Academy of Geological Sciences Department of Earth Science Karakoram International University

The Laojiezi alkaline volcanic rocks, which are located in the intraplate region of the Yangtze craton, coincide with the formation of the Jinshajiang-Ailaoshan-Red River alkaline rock belt. Although this belt has been widely studied by geologists because of its porphyry-related Pb-Ag-Au polymetallic deposit and geotectonic location, the material sources of this belt are still debate. Whole-rock analyses show that these rocks have high total alkali contents(3.73–11.08 wt%), and their aluminum saturation index(ASI) values widely vary from 0.82 to 3.07, which comprise a metaluminous-peraluminous magma series. These rocks are characterized by high K(K2 O/Na2 O>1) and low Ti and Mg contents; enrichment in large-ion lithophile elements, such as Rb, ba, K and light rare earth elements; and depletion in high field strength elements, such as Ta, Nb, P, and Ti. These rocks exhibit moderate Eu(Eu/Eu*=0.86–1.04) and Ce(Ce/Ce*=0.63–0.96) anomalies. Their(87 Sr/86 Sr)i, εNd(t), zircon εHf(t) and δ18 O values range from 0.70839 to 0.71013, from-10.16 to-12.45, from-19.6 to-5.8, and from 5.69‰ to 8.54‰, respectively, and their Nd and Hf two-stage model ages(TDM2) are 1.67–1.86 Ga and 1.27–2.02 Ga, respectively. These data reflect the primary partial melting of Paleoproterozoic to Mesoproterozoic lower crust with minor residual continental lithospheric mantle and supracrustal metasediments. The lithosphere was likely thickened along the southeastern margin of the Tibetan Plateau following the Indian-Asian continentcontinent collision(65–41 Ma). During the post-collision phase(36–16 Ma), the transition from a compressional to extensional setting triggered the convective removal of the over-thickened CLM beneath the Yangtze craton, which led to the upwelling of asthenospheric materials. This process created alkali-rich and high-K magma through the partial melting of the thickened lower crust. Magma that carried Cu-Au-Pb-Ag minerals was emplaced by strike-slip motion along the E-to W-

关键词： Sr-Nd-Hf-O isotopes alkaline volcanic rocks post-collision Laojiezi deposit western Yangtze craton

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