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Y Moro, Y Gotoh
Article type: Article
1997 Volume 24 Issue 2 Pages
232-
Published: July 01, 1997
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Surface structure and growth of Si deposited on a Mo(110)single crystal substrate were investigated by reflection high energy electron diffraction. Several kinds of surface structures of Si on the Mo substrate were observed according to the changes of film thickness and substrate temperature. In this time, we will mainly report surface. structures and growth features observed at low substrate temperature.
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S Ishibashi, Y Gotoh
Article type: Article
1997 Volume 24 Issue 2 Pages
233-
Published: July 01, 1997
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We have investigated the Mo(110)surface deposited with Mn by means of the Reflection High Energy Electron Diffraction and Scanning Electron Microscope. Five new surface ordered structures were observed at temperatures ranging from R.T. to 300℃ for various film thicknesses and a phase diagram for two-dimensional surface structures was constructed. The distorted shape of the Mn crystallites were caused from atomic arrangement of α-Mn(110)surface. The RHEED patterns indicate that Mn grows by the Stranski-Krastanov mode on the Mo(110) surface.
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T Irisawa, J Motohisa, M Akabori, T Fukui
Article type: Article
1997 Volume 24 Issue 2 Pages
234-
Published: July 01, 1997
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We have investigated the possibility of selcctive incorporation of Si into step edges of GaAs vicinal surfaces to form doping quantum wircs. It has shown that the selective incorporation actually take place particularly at the initial stage of the doping.
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S Takeya, T Uchida, K Gouhara, T Hondoh
Article type: Article
1997 Volume 24 Issue 2 Pages
235-
Published: July 01, 1997
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In-situ observations of gas hydrates by x-ray diffraction have been difficult because of the conditions growing under high pressure.Using the high-energy x-ray generator and the high pressure cell made of Al alloy, we made them possible. As a result, we observed the change of profiles from water to C0_2 hydrate.
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Hirohiko NAKAMURA, Masao SORAl, Masamichi ISHIKAWA, Toshikazu EBATO, H ...
Article type: Article
1997 Volume 24 Issue 2 Pages
236-
Published: July 01, 1997
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Methane hydrate can grow in methane saturated water if pressure/ temperature condition of the solution is in the hydrate stability region. To investigate pressure/ temperature dependence of the morphology and the growth rate of the hydrate, solution growth equipment with in-situ observation system had been designed and developed It was found that the hydrate crystals grow with macroscopically faceted morphology and relatively large growth rate.
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K Nagashima, Y Furukawa
Article type: Article
1997 Volume 24 Issue 2 Pages
237-
Published: July 01, 1997
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Akihiro Wakisaka, Yoshitaka Yamamot
Article type: Article
1997 Volume 24 Issue 2 Pages
238-
Published: July 01, 1997
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Cluster structures in electrolyte and nonelectrolyte solutions were studied by specially designed mass spectrometry. Neutral molecular clusters, solvated ion clusters and ion pairs were observed by this novel experiment. Neucleation process in solution is related with the observed cluster structure.
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Makiko Ohtake, Hisao Sato, Katsuo Tsukamoto, Hiroshi Ohmoto
Article type: Article
1997 Volume 24 Issue 2 Pages
239-
Published: July 01, 1997
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Oxygen isotope microzonings in natural garnet crystals in one of the oldest metamorphic rocks from the Isua metamorphic belt, Greenland were investigatedusing a C0_2 laser microprobe. Chemical and oxygen isotopic analyses were made to examine the condition of metamorphic crystallization. Observed chemical andoxygen isotopic profile, and the resuh of numerical modeling suggested that the Isua metamorphic garnet has grown during at least four growth stages. The second growth stage suggested the deuteric interactions which might accompanied with an ancient seawater or meteoric water.
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H Sato, K Tsukamoto, H Ohmoto
Article type: Article
1997 Volume 24 Issue 2 Pages
240-
Published: July 01, 1997
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Oxygen isotope(<18>^O and<16>^O)effect between dissolvedand adsorbed phosphate anion (P0_4^3 )on iron hydroxide was experimentally examined in the aqueous system using differential isotopemethod The chemical kinetics of adsorption density(μmole/m^2)suggested that the adsorption structure evolved from macropore(surface dffusion)to micropore diffusion. In the earlier process, no significant isotope fractionation on the macropore surface occurred but in the followed process,<18>^ bearing P0_4^3 was preferentially partitioned onto the surface site of micropore. An in situ laser Raman analysis distinguished these adsorption species and revealed that the formation of the FeP0_4 like structure dominated in the later adsorption process .
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H Sato, K Tsukamoto, H Ohmoto
Article type: Article
1997 Volume 24 Issue 2 Pages
241-
Published: July 01, 1997
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Anorthite (CaAl_2Si_20_8)crystals synthesized from their melts using a floating zone(FZ)system were isotopically evaluatedusing a C0_2 laser microprobe. BaO andMgO-dopedanorthite crystals show good correlations among the profiles of BaO, MgO, and the oxygen isotope ratio(<18>^0/ <16>^0). Another synthetic anorthite from homogeneous melt (Pt-spiral FZ)exhibited significant emichrnent of <18>^0 near the solid/liquid interface. These would provide an infonnation about the molecular behavior of oxygen or silicate anions. Probably, oxygen isotope zoning could be resulted from the non-steady state transport of <18>^0/ <16>bearing species toward the interface.
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M NAKAYAMA, Y NISHIMURA, S MIYASHITA, T NAKADA, G SAZAKI, H KOMATSU
Article type: Article
1997 Volume 24 Issue 2 Pages
242-
Published: July 01, 1997
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Crystallization of NdBa_2Cu_30_<7-8>crystals from high temperature solutions was observed in-situ. Changjng the supersaturation we could observed the morphologjcal change of the crystal shape. And measurement of the nucleation temperature enabled us to estimate the metastable region for nucleation.
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Y Takahashi, K Shigematsu, T Sawada, K Takemura, Y Taniguchi, S Sawamu ...
Article type: Article
1997 Volume 24 Issue 2 Pages
243-
Published: July 01, 1997
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Pressure-induced phase transitions of RbBr in the apueous solution system were observed in a diamond anvil cell. The equilibrium forms of low pressure phase (NaCl-type)of RbBr resembled those of RbCl, but no similarities of those high pressure phase (CsCl-type)were found. The crystal shapes of RbBr of CsCl-type were not stable, and did not attain to the equilibrium form.
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Toshiya Abe, Katsuo Tsukamoto, Motoi Fujishima
Article type: Article
1997 Volume 24 Issue 2 Pages
244-
Published: July 01, 1997
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We combined the Mach-Zhender interferometer and the in-situ observation system for high temporature crystal growth. This attempt was very successful. The concentrat,ion gradient around the crystal was verified to change dependent on the growth temperature.
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T Takayama, T Kume, K.J. Takano
Article type: Article
1997 Volume 24 Issue 2 Pages
245-
Published: July 01, 1997
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The effect of pressure on the mechanism of thermal roughening transition has been searched by viSual observation at high pressure. The thermal roughening transitions of (010)and(110)face of the crystal of tricosane, grown from an n-hexane solution, were obsenved. These crystal faces were faceted when the mole fraction of tricosane was less than the critical valuefor each face. Otherwise they were rounded. The critical values had not appreciable dependence on pressure, which seems to support the theory of X.Y.Liu et.al. The critical value of the(110)face, however,is much higher than that deduced by them.
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Kohzo Sakai, Hirohiko Nakamura, Masamichi Ishikawa
Article type: Article
1997 Volume 24 Issue 2 Pages
246-
Published: July 01, 1997
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The Zr02 dendritic crys_tal is normally occured as a defect in glass. Basically, glass meltug tank is made from Al203-Zr02-Si02 fused refractory. Zr02 crystal is most popular defects in glass. Zr02 dendrite has many different morphology. The relationship between morphology and glass network/modifier is studied.
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Tsuneo Okubo, Akira Tsuchida, Shinji Okada, Tsuyosi Okuda, Kohji Fujit ...
Article type: Article
1997 Volume 24 Issue 2 Pages
247-
Published: July 01, 1997
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Reflection spectroscopy and static amd dynamic light-scattering measurements are made for the kinetic analyses of the growing processes of colloidal crystals of polystyrene and silica spheres in highly diluted and exhaustively deionized aqueous suspensions. Colloidal crystallization is explalned beautifully by the classical diffusion theory of crystaliza-tion, though the restricted diffusion of the reacting spheres like as the fused metal sys-tems should be taken into account.
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Tsuneo OKUBO, Akira TSUCHIDA, Tsuyosi OKUDA, Kohji FUJITSUNA, Masamich ...
Article type: Article
1997 Volume 24 Issue 2 Pages
248-
Published: July 01, 1997
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Nucleation and growth processes of colloidal crystallization have been studied in a micro_gravity created by the parabolic flights of an aircraft. The induction time for nucleation and the growth rate are estimated from change in a Bragg reflection intensity in the course of crystallization. Significant decrease in the growth rates by 20-30 % is observed in a microgravity(O G)when compared with those in a gravity(1 G). The decrease is attributed to the retardation of the downward translational motion of the silica spheres and further no convection of the suspensions in a microgravity.
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E Yokoyama, K Tsukamot, K Maiwa, S Maruyama, S Yoda
Article type: Article
1997 Volume 24 Issue 2 Pages
249-
Published: July 01, 1997
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The growth rate of a dislocation-free{OO1}face of Ba(N0_3)crystal was measured with a realtime phaseshift interferometry(RPSI)in microgravity by the TR-IA #4 rocket in August 1995. We analyzed the timedependent growth with decreasing temperature by 6 degree in 370 seconds.
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Article type: Appendix
1997 Volume 24 Issue 2 Pages
App3-
Published: July 01, 1997
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Article type: Appendix
1997 Volume 24 Issue 2 Pages
App4-
Published: July 01, 1997
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Article type: Appendix
1997 Volume 24 Issue 2 Pages
App5-
Published: July 01, 1997
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Article type: Appendix
1997 Volume 24 Issue 2 Pages
App6-
Published: July 01, 1997
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Article type: Cover
1997 Volume 24 Issue 2 Pages
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Published: July 01, 1997
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