| 亚稳态Bi2SiO5晶体的制备及析晶热力学分析 |
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| 引用本文： | 郭宏伟,王秀峰,刘盼,门永.亚稳态Bi2SiO5晶体的制备及析晶热力学分析[J].西北轻工业学院学报,2013(2):30-33,61. |
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| 作者姓名： | 郭宏伟 王秀峰 刘盼 门永 |
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| 作者单位： | 陕西科技大学材料科学与工程学院,陕西西安710021 |
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| 基金项目： | 陕四省教育厅科研专项项目（12JK0446）;陕西省咸阳市科技局项目（2012K11-14）;西安市未央区科技局项目（201202）;陕西科技大学科研自选项目（ZX11-13,2012SB0]9）;陕西科技大学博士科研启动基金项目（BJ12-01） |
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| 摘 要： | 采用熔体冷却法制备了亚稳态Bi2SiO5硅酸铋晶体,利用XRD、SEM等表征分析了所制备Bi2SiO5多晶的晶型及形貌特征.通过系统在相平衡温度时的可逆相变过程,计算了析晶过程的ΔH、ΔS和ΔG.实验结果表明:组成中当摩尔比Bi2O3/SiO2为1∶1时,所生成的Bi2SiO5晶体在2h保温时间后仍没有发生晶型转变.所制备的单相Bi2SiO5晶粒呈现层状生长,且层与层之间呈现紧密生长.热力学分析表明:当温度T=T0-ΔT=973.15K时,ΔG=-7.478KJ<0,说明从基础熔体中析出Bi2SiO5的过程是自发进行的;同时,熔体中的分相有利于Bi2SiO5晶体的析出.
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| 关 键 词： | 硅酸铋 亚稳态 析晶热力学 |
Synthesis and crystallization thermodynamic of metastable states Bi2SiO5 crystals |
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| GUO Hong-wei,WANG Xiu-feng,LIU Pan,MEN Yong.Synthesis and crystallization thermodynamic of metastable states Bi2SiO5 crystals[J].Journal of Northwest University of Light Industry,2013(2):30-33,61. |
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| Authors: | GUO Hong-wei WANG Xiu-feng LIU Pan MEN Yong |
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| Affiliation: | (College of Materials Science and Engineering, Shaanxi University of Science ＆ Technology, Xi＇an 710021, China) |
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| Abstract: | Bi2SiO5 Metastable phase were prepared by high temperature solid state method, crystal form and structure morphology was investaged by XRD and SEM method. Through the reversible phase transition process under the temperature of system phase equilibrium, △H,△S and △G were calculated. It find that the structure of Bi2SiO5 would not change af- ter Insulation 2 hours if the Bi2O3 ： SiO2 = 1 ： 1. The grain of Bi2SiO5 was close grown by layer. Thermodynamic analysis shows that,when the temperature T= T0 -△ T =973. 15 K,△ G =- 7. 478 KJ （ 0, which means thatBi2SiO5 was spontaneous nucleation. Meanwhile, melt phase separation was conducive to theBi2SiO5 crystal growth. |
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| Keywords: | bismuth silicate steady state crystallization thermodynamics |
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