Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Toshikazu Osawa"'
Publikováno v:
Journal of Materials Science Letters. 10:164-166
Etude experimentale du frittage sous haute pression de poudres de diamant contenant des particules fines entre les grains plus gros. L'examen des images d'electrons secondaires montre une dissolution des particules fines par un processus d'adherence
Publikováno v:
Journal of Materials Science. 23:3821-3826
The infiltration behaviour of molten cobalt into a diamond powder compact was examined when the latter was placed on a cobalt disc and held at high pressure of 5.8 GPa and high temperature of 1350 to 1500° C. The larger the grain size of the startin
Autor:
Haruo Ohashi, Toshikazu Osawa
Publikováno v:
The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 82:100-105
Autor:
Makoto Kagamida, Shinobu Yamaoka, Akihiro Nukui, Toshikazu Osawa, Minoru Akaishi, Hisao Kanda
Publikováno v:
Journal of Crystal Growth. 94:261-269
A temperature gradient method was applied to grow a large cubic boron nitride (cBN) crystal under 5.5 to 6 GPa and 1700 to 1950°C using Li 3 BN 2 as a solvent. The crystals, free from inclusions and cracks, were grown successfully on a seed crystal
Publikováno v:
The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 78:159-163
Publikováno v:
The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 77:305-309
The crystal structure of NaTiSi2O6 pyroxene synthesized at 1500°C and 50 kb has been refined by the least squares method using 763 reflections measured using an automatic single crystal diffractometer. The unweighted R factor is 0.041 for 687 unreje
Autor:
Toshikazu Osawa, Haruo Ohashi
Publikováno v:
The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 76:368-371
Infrared spectra of In2Si2O7 and Lu2Si2O7 with thortveitite structure were measured in the frequency range 1300-400cm-1. The frequencies of the anti-symmetrical Si-O-Si stretching in In2Si2O7 and Lu2Si2O7 are 1175cm-1, and 1115cm-1, respectively. The
Publikováno v:
The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 80:499-502
The crystal structure of Cd3Al2Si3O12 garnet grown by the solid state reaction method has been refined by the least squares method using 316 reflections measured with an automatic single crystal diffractometer. The unweighted R factor is 0.039 for 24
Autor:
Haruo Ohashi, Toshikazu Osawa
Publikováno v:
The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 76:17-20
The pyroxenes in the system NaCrSi2O6-NaScSi2O6 have been synthesized at high pressure. The solubility of NaScSi2O6 component in NaCrSi2O6 pyroxene icreases with an increase of pressure and attains more than 30 mol% at 1500°C/50 kb
Publikováno v:
JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY. 84:70-73
Unit cell dimensions have been determined by means of the powder and single crystal X-ray diffraction methods for synthetic spodumenes in the system LiAlSi2O6-LiGaSi2O6, which have been crystallized at 1500°C and 60 kbar pressure. The unit cell dime