An experimental study of the formation and properties of synthetic serpentines and related layer silicate minerals
An experimental study of the formation and properties of synthetic serpentines and related layer silicate minerals
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合成蛇纹石及相关层状硅酸盐矿物的形成和性质的实验研究
DOI：
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发表时间：
1954
期刊：
影响因子：
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通讯作者：
R. Roy
中科院分区：
文献类型：
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作者：
D. Roy;R. Roy
用化学取代的方法验证了温石棉管状晶体的形成是水镁石层与二氧化硅层交替失配的结果。用Gea+代替Sia+增加四面体层的尺寸，形成了蛇形相MgoGeaor6(oH)r的六角形片状晶体。在减小八面体层尺寸的同时，增加四面体层尺寸的方法是将Ala+部分取代到结构中，形成板状铝蛇纹石mgsalalsioro (OH)n。用同样大小的Ni2+离子取代Mg2+会产生蛇形ni6si4010 (oH)4，根据其他因素，ni6si4010 (oH)4可以是管状的，也可以是板状的。合成的另一种蛇形相niogeoro (oH)a形成六角形片状晶体。其他离子的替代：Mn2+， Zn2+, Co2+, Fe3+, Crs+, gu:+，不能产生蛇纹石型结构。合成了许多其他的氢硅酸盐型结构，并比较了MgO-SiOrHrO、NiO-SiOr-HrO和MgO-GeOg_HrO体系中存在的相平衡关系。
The hypothesis that the formation of tubular crystals of chrysotile is the result of misfit of the alternate brucite and silica layers, is tested by means of chemical substitution. Increasing the size of the tetrahedral layer by substituting Gea+ for Sia+ results in the formation of hexagonal platy crystals of the serpentine phase, MgoGeaor6(oH)r. Decreasing the size of the octahedral layer and at the same time increasing the size of the tetrahedral layer is accomplished by partiai substitution of Ala+ into the structure to form platy aluminian serpentine, MgsAlAlSiaOro(OH)n. The replacement of Mg2+ by the similar-sized Ni2+ ion yields a serpentine Ni6si4o10(oH)4 which is either tubular or platy, depending on other factors. Another serpentine phase synthesized, NioGeaoro(oH)a, forms hexagonal platy crystals. Other substitutions using the following ions: Mn2+, Zn2+, Co2+, Fe3+, Crs+, and gu:+, fail to yield a serpentine type structure. A number of other hydrosilicate type structures have been synthesized, and comparisons are made of the phase equilibrium relations determined to be present among phases in the systems, MgO-SiOrHrO, NiO-SiOr-HrO and MgO-GeOg_HrO.