EngRN: Chemical Energy (Topic)最新文献

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Synthesis and Characterization of Nickel Nitrate As Additive Into SiO 2 Matrix by Supercritical Drying Method 超临界干燥法合成硝酸镍作为二氧化硅基体添加剂及表征

EngRN: Chemical Energy (Topic) Pub Date : 2020-04-08 DOI: 10.2139/ssrn.3567113

S. Jadhav, Pradip B. Sarawade

引用次数: 1

Quantitative Identification of Constituent Phases in a Nd-Fe-B Sintered Magnet and Temperature-Dependent Change in the Electron Density of Nd 2Fe 14B Studied by Synchrotron X-Ray Diffraction 同步x射线衍射研究Nd- fe - b烧结磁体组成相的定量鉴定和Nd- fe - 14B电子密度的温度依赖性变化

EngRN: Chemical Energy (Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3414006

H. Okazaki, D. Billington, N. Tsuji, W. Ueno, Y. Kotani, S. Kawaguchi, K. Sugimoto, K. Toyoki, T. Fukagawa, T. Nishiuchi, K. Hono, S. Hirosawa, Tetsuya Nakamura

{"title":"Quantitative Identification of Constituent Phases in a Nd-Fe-B Sintered Magnet and Temperature-Dependent Change in the Electron Density of Nd 2Fe 14B Studied by Synchrotron X-Ray Diffraction","authors":"H. Okazaki, D. Billington, N. Tsuji, W. Ueno, Y. Kotani, S. Kawaguchi, K. Sugimoto, K. Toyoki, T. Fukagawa, T. Nishiuchi, K. Hono, S. Hirosawa, Tetsuya Nakamura","doi":"10.2139/ssrn.3414006","DOIUrl":"https://doi.org/10.2139/ssrn.3414006","url":null,"abstract":"We measure the temperature-dependent XRD profiles of an isotropic Nd-Fe-B-Cu sintered magnet during the annealing process. Through Rietveld refinement, we demonstrate the changes in the volume fractions of the Nd2Fe14B main phase and the other secondary phases as a function of increasing temperature up to 1047 °C. The secondary phases include dhcp-Nd, fcc-NdOx, and hcp-Nd2O3 at room temperature and fcc-Nd at elevated temperatures. The main phase remains relatively stable up to 600 °C and starts melting above 900 °C, while diffraction from the dhcp-Nd phase completely disappears at around 600 °C. Taking advantage of the excellent quality of the XRD profiles in the powdered single-crystal sample, we also investigate the electron density distribution of the main phase by the maximum entropy method (MEM)/Rietveld analysis in order to elucidate the origin of the large magnetic anisotropy. From the subtraction of the electron density distributions recorded above (-123 °C) and below (-173 °C) the spin reorientation transition (-138 °C), we observe an anomalous change of the electron density distribution around the Nd f and g sites of Nd2Fe14B whose electron density distributions are intimately related to the magnetic anisotropy.","PeriodicalId":148039,"journal":{"name":"EngRN: Chemical Energy (Topic)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132397755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0