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Studies on Growth and Dissolution Mechanisms of Natural Crystals in Atomic Level

天然晶体的原子水平生长和溶解机理研究

基本信息

批准号：
06402021
负责人：
AOKI Yoshikazu
金额：
$ 17.98万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

项目摘要

1. A large number of diamond crystals were obtained when a tungsten thin plate was used as the substrate of hot-filament-assisted chemical vapor deposition. In this case, the substrate was covered by hexagonal tungsten carbide (WC) thin films and subsequently diamond crystals grew on them by facing its own (111) to the substrate. The sites of carbon atoms on (111) of diamond are in good accord with those on (0001) of WC.Hence WC microcrystals provided nucleation sites for subsequent diamond growth. Namely on (0001) of WC,(111) of diamond grew epitaxially, constructing the coincidence site lattice.2. Habit modification of carbon synthesized by hot-filament CVD was investigated. Carbon, excepting for diamond, changed their morphology from ball-like aggregate, carbon whisker, thin-film carbon to carbon tube with decreasing substrate temperature. These habit modification depends on the structural connection of graphene with temperature.3. The maximum temperatures for H6, L6, and LL6 chondrites obtained by using the relation diagram between [2rheta (131)-2rheta (131)] and equilibration temperature of plagioclase were 755,840, and 830ﾟC,respectively. These temperatures correspond to the temperatures at which plagioclase crystallized from pre-existing glass during the progressive alteration processes in parent body.4. In the alteration experiments of phlogopite with acid solutions, the dissolution of phlogopite occurred incongruently, and the priority in the dissolution was in the order, K>Fe>Mg, Al>Si. Vermiculite and interstratified mica/vermiculite were formed depending on the release rate of K from phlogopite.

1.以钨薄板为衬底，采用热灯丝辅助化学气相沉积法，获得了大量的金刚石晶体。在这种情况下，衬底被六方碳化钨（WC）薄膜覆盖，随后金刚石晶体通过使其自身（111）面向衬底而在其上生长。金刚石（111）面上的碳原子位置与WC（0001）面上的碳原子位置雅阁，WC微晶为后续金刚石生长提供了形核位置。即在WC的（0001）晶面上，金刚石的（111）晶面外延生长，构成重合位点阵.研究了热丝CVD法合成碳的习性改性。随着衬底温度的降低，除金刚石外，碳的形貌由球状聚集体、碳晶须、薄膜碳向碳管转变。这些习性改变依赖于石墨烯的结构与温度的关系.利用[2 rheta（131）-2 rheta（131）]与斜长石平衡温度的关系图获得的H6、L 6和LL 6球粒陨石的最高温度分别为755、840和830 ° C。这些温度对应于斜长石在母岩中的渐进蚀变过程中从预先存在的玻璃中结晶出来的温度。在金云母的酸蚀实验中，金云母的溶解是不一致的，溶解的优先顺序为K>Fe>Mg，Al>Si。金云母钾的释放速率决定了蛭石和云母/蛭石间层的形成。