| 褐钇铌矿族矿物变生非晶态的高温相变研究 |
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| 引用本文： | 贡伟亮.褐钇铌矿族矿物变生非晶态的高温相变研究[J].矿物学报,1991,11(1):1-8,T001. |
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| 作者姓名： | 贡伟亮 |
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| 作者单位： | 中国科学院地球化学研究所 贵阳 |
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| 摘 要： | 采用高温X射线衍射分析和退火结晶实验，研究了褐钇铌矿族矿物变生非晶态的高温相变关系。确认自然界稳定存在T（四方）和M（单斜）两种变,体，高温下还存在另一个四方变体T′。T，M和T′三者间关系为：T＞730－880℃／→T′＜730－880℃／→／←M。相变湿度受A组阳离子的平均离子半径控制。进而讲座了T和T′的结构差异，并指出相对于T′的晶格畸变是T相室温稳定的原因。此外，还讨论了变生非晶态的结构，提出了鉴定变生非晶态原生相的有效方法，并在白云鄂博矿床中鉴定出本族矿物6种12个亚种矿物，首次给出了本族矿物新成员－－T－褐钕铌矿的X射线粉晶数据。
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| 关 键 词： | 褐钇铌矿族 高温相变 高温X射线衍射 变生非晶态 退火结晶 变体 相变温度 |
A STUDY ON HIGH-TEMPERATURE PHASE TRANSITION OF METAMICT FERGUSONITE GROUP MINERALS |
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| Gong Weiliang.A STUDY ON HIGH-TEMPERATURE PHASE TRANSITION OF METAMICT FERGUSONITE GROUP MINERALS[J].Acta Mineralogica Sinica,1991,11(1):1-8,T001. |
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| Authors: | Gong Weiliang |
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| Abstract: | In-situ high-temperature XRD and annealling recrystallization experiment were used to study the high-temperature phase transition of metamict fergusonite group minerals. Three polymorphs of the fergusonite group are recognized: M(monoclinic) and T(tetragonal) stable in nature, andT'(another tetragonal form) only stable at higher temperature. Their relationship is expressed as. The transition temperatures are dependent on the ionic radii of Group A atoms. The differences between T and T', and the structure of the amorphous state are discussed it, this paper,Additionally, six varieties and twelve subvarieties of the fergusonite group have been identified in Bayun Obo. X-ray powder diffraction data of T-fergusonite-(Nd), a new member of the fergusonite group, are given for the first time. |
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| Keywords: | fergusonite group high-temperature phase transition hightemperature XRD metamict mineral phase transition |
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