{"title":"Phase Diagram and Metastable Phases in the LaPO4–YPO4–(H2O) System","authors":"M. O. Enikeeva, O. V. Proskurina, V. V. Gusarov","doi":"10.1134/s0036023623603021","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Phase formation in the LaPO<sub>4</sub>–YPO<sub>4</sub>–(H<sub>2</sub>O) system have been studied under hydrothermal conditions at <i>T</i> ~ 230°C and after heat treatment in air in the temperature range 1000–1400°C. The phase equilibria diagram in the system has been constructed for the LaPO<sub>4</sub>–YPO<sub>4</sub> system. The regions of metastable binodal and spinodal decomposition of a phase with a monazite structure with a critical point <i>T</i><sub>cr</sub> = 931°C have been calculated. The experimentally determined eutectic temperature of 1850 ± 35°C is in good agreement with the calculated value <i>T</i><sub>e</sub> = 1820°C. The maximum solubility of YPO<sub>4</sub> in LaPO<sub>4</sub> at eutectic temperature obtained from the results of thermodynamic optimization of the phase diagram is 50.5 mol %.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":null,"pages":null},"PeriodicalIF":1.8000,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Inorganic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1134/s0036023623603021","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
Phase formation in the LaPO4–YPO4–(H2O) system have been studied under hydrothermal conditions at T ~ 230°C and after heat treatment in air in the temperature range 1000–1400°C. The phase equilibria diagram in the system has been constructed for the LaPO4–YPO4 system. The regions of metastable binodal and spinodal decomposition of a phase with a monazite structure with a critical point Tcr = 931°C have been calculated. The experimentally determined eutectic temperature of 1850 ± 35°C is in good agreement with the calculated value Te = 1820°C. The maximum solubility of YPO4 in LaPO4 at eutectic temperature obtained from the results of thermodynamic optimization of the phase diagram is 50.5 mol %.
期刊介绍：
Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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