{"title":"新型稀土硼碳化铑的合成","authors":"Toetsu Shishido , Kunio Yubuta , Takao Mori , Shigeru Okada , Takashi Yamasaki , Akira Yoshikawa","doi":"10.1016/j.pscr.2014.08.009","DOIUrl":null,"url":null,"abstract":"<div><p>Single crystals of a new quaternary compound, ErRh<sub>2</sub>B<sub>2</sub>C, were obtained by the flux growth method using molten copper as a flux. The extracted crystals show golden-coloured luster and a maximum size of approximately 1 × 1 × 0.02 mm<sup>3</sup>. This compound has tetragonal symmetry and appeared to be a derivative of the ThCr<sub>2</sub>Si<sub>2</sub>-type; the lattice parameters are <em>a</em> = 0.36848(2) nm and <em>c</em> = 1.05520(3) nm. The electrical resistivity parallel to the a-b plane of the crystal decreases with decreasing temperature. The residual resistance ratio <em>ρ</em> (273 K)/<em>ρ</em> (1.5 K) is 1.38. No superconductivity was observed down to 1.5 K. The search for similar types of new compounds was performed using the arc-melting synthetic method. The new quaternary RRh<sub>2</sub>B<sub>2</sub>C compounds are obtained for <em>R</em> = La – Er (except Eu) and Y. The phase stability of RRh<sub>2</sub>B<sub>2</sub>C was discussed.</p></div>","PeriodicalId":100998,"journal":{"name":"Pacific Science Review","volume":"16 1","pages":"Pages 45-48"},"PeriodicalIF":0.0000,"publicationDate":"2014-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.pscr.2014.08.009","citationCount":"0","resultStr":"{\"title\":\"Syntheses of new rare-earth rhodium borocarbides\",\"authors\":\"Toetsu Shishido , Kunio Yubuta , Takao Mori , Shigeru Okada , Takashi Yamasaki , Akira Yoshikawa\",\"doi\":\"10.1016/j.pscr.2014.08.009\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Single crystals of a new quaternary compound, ErRh<sub>2</sub>B<sub>2</sub>C, were obtained by the flux growth method using molten copper as a flux. The extracted crystals show golden-coloured luster and a maximum size of approximately 1 × 1 × 0.02 mm<sup>3</sup>. This compound has tetragonal symmetry and appeared to be a derivative of the ThCr<sub>2</sub>Si<sub>2</sub>-type; the lattice parameters are <em>a</em> = 0.36848(2) nm and <em>c</em> = 1.05520(3) nm. The electrical resistivity parallel to the a-b plane of the crystal decreases with decreasing temperature. The residual resistance ratio <em>ρ</em> (273 K)/<em>ρ</em> (1.5 K) is 1.38. No superconductivity was observed down to 1.5 K. The search for similar types of new compounds was performed using the arc-melting synthetic method. The new quaternary RRh<sub>2</sub>B<sub>2</sub>C compounds are obtained for <em>R</em> = La – Er (except Eu) and Y. The phase stability of RRh<sub>2</sub>B<sub>2</sub>C was discussed.</p></div>\",\"PeriodicalId\":100998,\"journal\":{\"name\":\"Pacific Science Review\",\"volume\":\"16 1\",\"pages\":\"Pages 45-48\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2014-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/j.pscr.2014.08.009\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Pacific Science Review\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1229545014000102\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Pacific Science Review","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1229545014000102","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
以铜液为助熔剂,采用助熔剂生长法制备了新型季系化合物ErRh2B2C的单晶。提取的晶体呈金黄色光泽,最大尺寸约为1 × 1 × 0.02 mm3。该化合物具有四方对称,似乎是thcr2si2型的衍生物;晶格参数为a = 0.36848(2) nm, c = 1.05520(3) nm。平行于晶体a-b面的电阻率随温度的降低而减小。剩余电阻比ρ (273 K)/ρ (1.5 K)为1.38。在1.5 K以下未观察到超导性。用电弧熔合成法寻找相似类型的新化合物。在R = La - Er (Eu除外)和y的条件下,得到了新的四元RRh2B2C化合物。
Single crystals of a new quaternary compound, ErRh2B2C, were obtained by the flux growth method using molten copper as a flux. The extracted crystals show golden-coloured luster and a maximum size of approximately 1 × 1 × 0.02 mm3. This compound has tetragonal symmetry and appeared to be a derivative of the ThCr2Si2-type; the lattice parameters are a = 0.36848(2) nm and c = 1.05520(3) nm. The electrical resistivity parallel to the a-b plane of the crystal decreases with decreasing temperature. The residual resistance ratio ρ (273 K)/ρ (1.5 K) is 1.38. No superconductivity was observed down to 1.5 K. The search for similar types of new compounds was performed using the arc-melting synthetic method. The new quaternary RRh2B2C compounds are obtained for R = La – Er (except Eu) and Y. The phase stability of RRh2B2C was discussed.