| Budget Amount *help |
¥28,100,000 (Direct Cost: ¥28,100,000)
Fiscal Year 1996: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥24,500,000 (Direct Cost: ¥24,500,000)
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| Research Abstract |
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.
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