Experimental study and thermodynamic assessment of the MgO-Al2O3-P2O5 system

IF 1.9 3区 材料科学 Q4 CHEMISTRY, PHYSICAL
Caisheng Guo , Fengyang Gao , Caicai Zhang , Tengfei Deng
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引用次数: 0

Abstract

The phase relationships of the MgO-Al2O3-P2O5 system at 1473 K was determined using the quenching method. The ternary compound MgAl(PO4)O was considered in this study, which had not been addressed in previous reports. The phase diagram of the MgO-Al2O3-P2O5 system was thermodynamically assessed using the CALculation of PHAse Diagram (CALPHAD) method with Thermo-Calc software, incorporating both the experimental data from this study and existing literature data. An ionic two-sublattice model, (Mg+2, Al+3)P(O−2,AlO2−1,PO4−3,PO7/2−2,PO3−1,PO5/2)Q was used to described the liquid phase of the MgO-Al2O3-P2O5 system. The excess Gibbs energy was formulated by the Redlich-Kister expression. All solid intermediate compounds containing phosphorus were treated as stoichiometric compounds. The Gibbs energy of intermediate compounds could be modeled following Neumann-Kopp's rule. A set of self-consistent thermodynamic parameters for the MgO-Al2O3-P2O5 system was obtained and the calculated phase diagrams were in good agreement with the experimental data. This work contributes to the construction of the database for high-order systems, thereby facilitating the synthesis of phosphorus-containing materials.
MgO-Al2O3-P2O5体系的实验研究及热力学评价
采用淬火法测定了1473 K时MgO-Al2O3-P2O5体系的相关系。本研究考虑了三元化合物MgAl(PO4)O,这在以前的报道中没有涉及。结合本研究的实验数据和已有文献数据,利用heat - calc软件,采用计算相图(CALPHAD)方法对MgO-Al2O3-P2O5体系的相图进行热力学评估。采用离子双亚晶格模型(Mg+2, Al+3)P(O−2,AlO2−1,PO4−3,PO7/2−2,PO3−1,PO5/2)Q来描述MgO-Al2O3-P2O5体系的液相。多余的吉布斯能由Redlich-Kister表达式表示。所有含磷固体中间化合物均作为化学计量化合物处理。中间化合物的吉布斯能可以用诺伊曼-科普规则来模拟。得到了一组自洽的MgO-Al2O3-P2O5体系热力学参数,计算相图与实验数据吻合较好。这项工作有助于构建高阶系统的数据库,从而促进含磷材料的合成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.00
自引率
16.70%
发文量
94
审稿时长
2.5 months
期刊介绍: The design of industrial processes requires reliable thermodynamic data. CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) aims to promote computational thermodynamics through development of models to represent thermodynamic properties for various phases which permit prediction of properties of multicomponent systems from those of binary and ternary subsystems, critical assessment of data and their incorporation into self-consistent databases, development of software to optimize and derive thermodynamic parameters and the development and use of databanks for calculations to improve understanding of various industrial and technological processes. This work is disseminated through the CALPHAD journal and its annual conference.
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