| Project/Area Number |
63550521
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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 |
金属材料(含表面処理・腐食防食)
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| Research Institution | ISHINOMAKI SENSHU UNIVERSITY (1989)
Tohoku University (1988) |
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Principal Investigator |
MOCHIZUKI Katsumi ISHINOMAKI SENSHU UNIVERSITY, FACULTY OF SCIENCE AND ENGINEERING, DEPARTMENT OF ELECTRONIC MATERIALS, ASSOCIATE PROFESSOR, 理工学部, 助教授 (30089792)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Multinary solid solution / Lead chalcogenide solid solution semiconductor / simultaneous control of composition and stoichiometry / solubility limit / P-T-X diagram / P-T-X図 / 多元系半導体 / 新固溶半導体 / 組成とストイキオメトリーの同時制御 |
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| Research Abstract |
Attention is recently paid to the new materials for tunable laser diode, lasing at about 3.5mum. The laser diodes are expected as the light source for optical communications in the next generation. The quarternary (Pb_<1-x>Cd_x) (S_<1-z>Se_z)_<1+y> are best suited to the above purposes. In this study, a new method for simultaneously controlling the composition x,z and the deviation y from stoichiometry was proposed for the quarternay solid solution. That is, the activity of sulfur(Ps_2), selenium(Pse_2) and CdS_<1-z>Se_z(a_<cds1-z'sez'>) were controlled independently in the heat-treatment process of the solid solution by providing two reservoir chambers in the heat-treatment tube. They are the mixing reservoir of sulfur and selenium and a CdS reservoir. As a result, it was found that the composition x and z of the solid solution is seriously effected by a CdS reservoir(a_<cds1-z'sez'>) and the mole ratio of S and Se in the mixing reservoir, respectively. The deviation y from stoichiometry could also be controlled simultaneously by regulating the sum of chalcogen partial pressures (Ps_2+Pse_2), keeping a_<cds1-z'sez'> and the mole ratio of sulfur and selenium in the mixing reservoir to a specific value corresponding to the target composition x and z. Based on this principle, the diagrams of P(Ps_2+pse_2)-T(heat-treatment temperature)-y(deviation from stoichiometry) was obtained successfully for this quarternary solid solution.
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