{"title":"几种钒、铌、钽硼化物的硼化制备","authors":"P. Peshev, L. Leyarovska, G. Bliznakov","doi":"10.1016/0022-5088(68)90184-7","DOIUrl":null,"url":null,"abstract":"<div><p>The formation of vanadium, niobium and tantalum diborides by the reactions of V<sub>2</sub>O<sub>3</sub>, Nb<sub>2</sub>O<sub>5</sub> and Ta<sub>2</sub>O<sub>5</sub> with elemental boron under vacuum in the temperature range 1000 °–1750 °C has been investigated. It has been established that niobium and tantalum diborides with a composition close to that of stoichiometric NbB<sub>2</sub> and TaB<sub>2</sub> are obtained after a heat treatment of the reactants at 1650 °C for 1 h. Borothermic reduction of V<sub>2</sub>O<sub>3</sub> does not give a single-phase product but a mixture of VB<sub>2</sub> and VB.</p><p>A method for the chemical analysis of NbB<sub>2<sup>−</sup></sub> and TaB<sub>2</sub> samples has been proposed.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1968-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(68)90184-7","citationCount":"57","resultStr":"{\"title\":\"On the borothermic preparation of some vanadium, niobium and tantalum borides\",\"authors\":\"P. Peshev, L. Leyarovska, G. Bliznakov\",\"doi\":\"10.1016/0022-5088(68)90184-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The formation of vanadium, niobium and tantalum diborides by the reactions of V<sub>2</sub>O<sub>3</sub>, Nb<sub>2</sub>O<sub>5</sub> and Ta<sub>2</sub>O<sub>5</sub> with elemental boron under vacuum in the temperature range 1000 °–1750 °C has been investigated. It has been established that niobium and tantalum diborides with a composition close to that of stoichiometric NbB<sub>2</sub> and TaB<sub>2</sub> are obtained after a heat treatment of the reactants at 1650 °C for 1 h. Borothermic reduction of V<sub>2</sub>O<sub>3</sub> does not give a single-phase product but a mixture of VB<sub>2</sub> and VB.</p><p>A method for the chemical analysis of NbB<sub>2<sup>−</sup></sub> and TaB<sub>2</sub> samples has been proposed.</p></div>\",\"PeriodicalId\":17534,\"journal\":{\"name\":\"Journal of The Less Common Metals\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1968-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0022-5088(68)90184-7\",\"citationCount\":\"57\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of The Less Common Metals\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0022508868901847\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The Less Common Metals","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0022508868901847","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
On the borothermic preparation of some vanadium, niobium and tantalum borides
The formation of vanadium, niobium and tantalum diborides by the reactions of V2O3, Nb2O5 and Ta2O5 with elemental boron under vacuum in the temperature range 1000 °–1750 °C has been investigated. It has been established that niobium and tantalum diborides with a composition close to that of stoichiometric NbB2 and TaB2 are obtained after a heat treatment of the reactants at 1650 °C for 1 h. Borothermic reduction of V2O3 does not give a single-phase product but a mixture of VB2 and VB.
A method for the chemical analysis of NbB2− and TaB2 samples has been proposed.
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