High Pressure Synthesis of Boron Oxide with Diamond Structure and Its Mechanical Property
| Project/Area Number |
61550564
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
ENDO Tadashi Faculty of Engineering, Tohoku University, 工学部, 助教授 (30176797)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Tsugio Faculty of Engineering, Tohoku University, 工学部, 講師 (90091694)
SHIMADA Masahiko Faculty of Engineering, Tohoku University, 工学部, 教授 (80029701)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | high pressure synthesis / diamond structure / boron oxide / supper hard material / III-VI compound / periodic compound / リン化ほう素 / 半導体 / 【III】-【IV】族化合物 / 周期律化合物 |
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| Research Abstract |
A new sandwich-type high pressure cell has been developed in the present study. Boron phosphide, BP, was used as a starting materials, CrO_3 was charged into the cylindrical platinum capsule, and disposed with BP separated by Zr foil or ZrO_2 disk. By decomposing of CrO_3 into CrO_2, effective oxygen gas pressure for oxydizing was supplied. The closed capsule was inserted into the high pressure cell, and subjected to high pressure-temperature conditions of 6 GPa and 1200゜C for 20 hr using a belt type apparatus.
The high pressure products were opaque in dark brown, and blocky shape with was maximum length of 100 <micrn>m. The x-ray powder diffraction patterns of sample were very similar to those of diamond and the crystal structure of sample can be classified of trigonal symmetry with lattice constants of a= 0.2879 nm, c= 0.7052 nm. From the result of the measured density of 2.48 g/cm^3, the numberof molecules in unit cell was determined to be 2. By judging from an extinction rule for the results of electron diffraction, the space group be longed to P3.
The high pressure sintering of B_2O was carried out at conditions of 6 GPa and 1000゜C for 2 hr. The relative density of sintered B_2 O was about 92% and the Vicker's microhardness was evaluated to be 40 GPa.
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Report
(2 results)
Research Products
(5 results)
