{"title":"Phase Equilibria and Crystal Growth in the Alkali Antimonate Systems Sb<sub>2</sub>O<sub>4</sub>-NaSbO<sub>3/</sub> Sb<sub>2</sub>O<sub>4</sub>-KSbO<sub>3/</sub>, and Sb<sub>2</sub>O<sub>4</sub>-NaSbO<sub>3</sub>-NaF.","authors":"J L Waring, R S Roth, H S Parker, W S Brower","doi":"10.6028/jres.080A.070","DOIUrl":null,"url":null,"abstract":"<p><p>Phase equilibrium diagrams have been constructed from experimental data for the systems Sb<sub>2</sub>O<sub>4</sub>-NaSbO<sub>3</sub>, Sb<sub>2</sub>O<sub>4</sub>-KSbO<sub>3</sub>, and Sb<sub>2</sub>O<sub>4</sub>-NaSbO<sub>3</sub>-NaF. The system Sb<sub>2</sub>O<sub>4</sub>-NaSbO<sub>3</sub> contains only an intermediate pyrochlore type solid solution with a maximum melting point of 1490 °C at a Na:Sb atom ratio of 3:5. The Sb<sub>2</sub>O<sub>4</sub>-KSbO<sub>3</sub> system contains in addition to the pyrochlore phase a compound 3K<sub>2</sub>O • 5Sb<sub>2</sub>O<sub>5</sub> which melts congruently at about 1450 °C and two polymorphs of K<sub>2</sub>O • 2Sb<sub>2</sub>O<sub>5</sub>. The low temperature form of K<sub>2</sub>O • 2Sb<sub>2</sub>O<sub>5</sub> was found to be monoclinic P2<sub>1</sub>/c with <i>a</i> = 7.178, <i>b</i> = 13.378, <i>c</i> = 11.985 A, <i>β</i> = 124°10'. The melting point of Sb<sub>2</sub>O<sub>4</sub> was found to be 1350 <i>±</i> 5 °C and NaSbO<sub>3</sub> and KSbO<sub>3</sub> both melt congruently at 1555 ± 5 °C and 1410 ± 5 °C respectively. The previously reported cubic form of KSbO<sub>3</sub> was found to be a K<sup>+</sup> deficient phase stabilized by reaction with atmospheric moisture. A similar cubic phase which appears to be a good Na<sup>+</sup> ion conductor can be synthesized in the ternary system NaSbO<sub>3</sub>-Sb<sub>2</sub>O<sub>4</sub>-NaF.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5312759/pdf/","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.6028/jres.080A.070","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"1976/10/1 0:00:00","PubModel":"Epub","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8
Abstract
Phase equilibrium diagrams have been constructed from experimental data for the systems Sb2O4-NaSbO3, Sb2O4-KSbO3, and Sb2O4-NaSbO3-NaF. The system Sb2O4-NaSbO3 contains only an intermediate pyrochlore type solid solution with a maximum melting point of 1490 °C at a Na:Sb atom ratio of 3:5. The Sb2O4-KSbO3 system contains in addition to the pyrochlore phase a compound 3K2O • 5Sb2O5 which melts congruently at about 1450 °C and two polymorphs of K2O • 2Sb2O5. The low temperature form of K2O • 2Sb2O5 was found to be monoclinic P21/c with a = 7.178, b = 13.378, c = 11.985 A, β = 124°10'. The melting point of Sb2O4 was found to be 1350 ± 5 °C and NaSbO3 and KSbO3 both melt congruently at 1555 ± 5 °C and 1410 ± 5 °C respectively. The previously reported cubic form of KSbO3 was found to be a K+ deficient phase stabilized by reaction with atmospheric moisture. A similar cubic phase which appears to be a good Na+ ion conductor can be synthesized in the ternary system NaSbO3-Sb2O4-NaF.
利用实验数据建立了Sb2O4-NaSbO3、Sb2O4-KSbO3和Sb2O4-NaSbO3- naf体系的相平衡图。在Na:Sb原子比为3:5的条件下，Sb2O4-NaSbO3体系仅含中间焦绿盐型固溶体，最大熔点为1490℃。在Sb2O4-KSbO3体系中，除焦绿石相外，还含有在1450℃时完全熔化的化合物3K2O•5Sb2O5和两种K2O•2Sb2O5的多晶相。K2O•2Sb2O5的低温形态为单斜晶型P21/c, a = 7.178, b = 13.378, c = 11.985 a， β = 124°10′。Sb2O4的熔点为1350±5℃，NaSbO3和KSbO3的熔点分别为1555±5℃和1410±5℃。先前报道的立方形式的KSbO3被发现是与大气湿度反应稳定的K+缺乏相。在三元体系NaSbO3-Sb2O4-NaF中可以合成一种类似的立方相，它似乎是Na+离子的良好导体。
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