| 铝硅酸盐熔体微结构单元的探讨 |
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| 引用本文： | 蒋国昌,吴永全,尤静林,侯怀宇,陈辉.铝硅酸盐熔体微结构单元的探讨[J].岩石学报,2004,20(3):753-758. |
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| 作者姓名： | 蒋国昌 吴永全 尤静林 侯怀宇 陈辉 |
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| 作者单位： | 上海大学材料科学与工程学院,上海,200072 |
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| 基金项目： | 国家自然科学基金(项目批准号:No.59874016和No.59832080) |
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| 摘 要： | 本文是一篇综述，讨论在熔融铝硅酸盐和铝酸盐中Al的两性行为。这是7台金学和岩石学中一个至今尚无可靠结论的问题。作者认为：每个四配位的Ala都含一个配位键，例如Al—O(^Ca Si)或Al—O(^Ca Al)。相应的非桥氧Onb并没有消失，而是变成了三价氧离子。碱性Alb能否出现取决于该体系的酸碱平衡。构筑硅酸盐的键合结构模型时，作者建议用5种Si-O四面体(Qn)作为微结构单元。即，用它们的相对量和微观化学位描述其宏观物性(如组元活度)。为了沟通铝硅酸盐的微观结构与宏观物性，仍可用5种Qn作为微结构单元。其中所含Ala的影响用各种Qn微观化学位的相应变化来反映。对于铝酸盐，建议用Ala-O四面体(Tn)作为微结构单元。
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| 关 键 词： | 铝硅酸盐和铝酸盐 熔体微结构 两性化合物 |
| 文章编号： | 1000-0569/2004/020(03)-0753-58 |
| 修稿时间： | 2003年2月12日 |
Discussion on the microstructure units of alumino-silicate melts |
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| Abstract: | This is a review concerning the discussion on amphoteric behavior of Al in molten alumino-silicates and aluminates,
which is significant in both metallurgy and petrology. So far it does not acquire a reliable conclusion. According to the present authore
every one 4-coordinated Al_a gains a coordination bond, such as Al--O Ca Si or Al--O Ca Al. Meanwhile, the corresponding non-
bridging oxygen O_(nb) does not disappear, it becomes a O~(3-). Whether the 6-coordinated Al_b can appear or not is determined by the acid-
basicity equilibrium of the system. For the cluster model of silicates it was suggested by the present authors that 5 Si-O tetrahedra (Q_n)
should be used as the microstructural units. Namely, to describe the macro-properties (as component activity) based on the information
of the molar fraction and micro chemical poential of these Q_n. In order to link the microstructure with the macro-properties of alumino-
silicates 5 kinds of Q_n still can be used. The influence of containing Al may be reflected by the associating change of the micro-chemical
potential of these Q_n. For aluminates, it is suggested to use Al_a-O tetrahedral (T_n) as the microstructural units. |
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| Keywords: | Alumino-silicates and aluminates Microstructure of melts Amphoteric compound |
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