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Lithium Niobate(LiNbO₃) 단결정의 경도에 관한 연구
진광수,김창선,장민수 부산대학교 물성연구소 1984 물성연구소연구논문집 Vol.3 No.-
순수한 LiNbO3 단결정과 불순물 (Ti,Fe,Cr)을 첨가한 단결정의 X, Y, Z-면에 따른 경도를 Vickers 경도계로서 측정하였다. 본 실험에서 측정한, 순수한 이단결정의 Vickers 경도값 588.87 Kgf-mm^(-)²은, mohs경도치로 환산하면 5.5이다. 이 값은 Mohs 경도치 (H)와 bond-ionicity(α)와의 관계식 H=K(1-⅔α⁴)에 의한 계산치 5.3에 아주 가깝다. 또한 측정한 경도값들을 보면, 불순물을 첨가한 것이 순수한 것보다 그 값이 더 컸으며, 불순물 첨가에 관계없이 Z-positive, Y-positive, X, Z-negative, Y-negative면의 순으로 그 경도 값이 작아졌다. The hardness of LiNbO₃single crystal has been studied both theoretically and experimentally. Theoretical approach to the hardness of LiNbO₃ single crystal constitutes the application of an empirical relation,H=K(1-⅔α⁴)derived between the smoothed Mohs hardness value H and the bondionicity α. The calculated H-scale of LiNbO₃is theoretically 5.3 The experimental methods consist of micro Vicker hardness measurement and the chemical etching. The hardness measurements are made on x, y, and z-planes of pure and transition elements(Ti, Fe, and Cr) doped LiNbO₃single crystals. The average indentation hardness value of LiNbO₃single crystals is 588.87 kgf.mm^(-)². The chemical etching method is utilized to trace the relationship between etching rate and hardness on x, y, and z-planes of LiNbO₃single crystal.
Al 再結晶化 過程에 있어서 電氣抵抗에 依한 結晶粒 成長機構에 關한 硏究(Ⅱ)
陳光守 부산대학교 1976 論文集 Vol.21 No.2
This paper attempts to examine closely the mechanism of the recrystallization in metal by investigating the electric resistance of Al. In order to investigate the change of property of Al during the growing stage, its eletric resistance was measured in the temperature range between 150℃ and 630℃. The specific resistance of Al whose length was elongated by 3.5% was found to be varied by 1.5% compared with what was not elongated.
LiNbO₃ 단결정 표면의 Chemical Etching에 관한 연구
진광수,김정남,이재현 부산대학교 물성연구소 1984 물성연구소연구논문집 Vol.3 No.-
LiNbO₃단결정의 X, Y, Z _ 면상에 chemical etching을 하여 여러가지 etch pit와 hillock pattern을 얻었다. 본 실험에서 사용한 etchant는 이미 알려진 HF, HNO₃를 모체로 하여 CH₃COOH, KBr, Li₂CO₃, Nb₂O_(5) 그리고 H₂SO_(6)중에서 한가지 또는 두가지를 첨가한 것을 사용함으로써 선명한 etch pattern을 얻었다. 그리고 이결정의 각 면에 생긴 etch pattern들을 좌표측에 따라 입체적으로 그려서 정리하고, ion배열을 조사하였다. The etch pits and hillocks are produced on the different crystallographic planes in LiNbO₃single crystal by the chemical etching. Various new compositions of CH₃COOH, KBr, Li₂CO₃, Nb₂O_(5) and H₂SO₄are tried to find the reliable etchant for X, Y, and Z-planes of LiNbO₃single crystals. Furthermore the relationship of ethcing morphology with the ionic arrangement on each crystallographic plane are discussed.
Bi₂(MoO₄)₃단결정 b-plane의 Chemical Etching에 관한 연구
진광수,한광호,장민수 부산대학교 기초과학연구소 1987 부산대학교 기초과학연구소 연구논문집 Vol.7 No.-
Bi₂(Mo0₄)₃단결정을 질산과 불산을 혼합한 부식액들을 사용하여 온도와 시간을 달리하여 부식시켰다. Bi₂(Mo0₄)₃단결정의 b-plane에는 HF:HNO₃= 1:2인 부식액이 적합하였다. Et-ch pattern 들을 근거로 하여 Bi₂(Mo0₄)₃)의 결정구조를 논의하였고, 이 결정 b-plane의 vickers 경도값은 333kg·f/mm²이었다. B₂(Mo0₄)₃single crystals were etched at various temperatures and times using the etchants which are consisted of HNO₃and HF. The etchant, HF:HNO₃=1:2, is reliable solution in producing etch pits on b-plane of Bi₂(Mo0₄)₃ single crystals. The crystal structure is discussed on the basis if etch patterns. The Vickers hardness of b-plane of Bi₂(Mo0₄)₃single crystals is 333kg·f/mm²
Al 단결정육성 과정에 나타난 질량비와 강도에 관한 연구
진광수,황선주 부산대학교 1986 자연과학논문집 Vol.41 No.-
The multipass zone refining and the Bridgman technique were applied in the single crystal growing of aluminium. The optimum conditions can be summarized as follows; the temperature (760℃), the soaking time (4 hours), the pulling velocity (3~4cm/hr), and the pulling time (4 times). The hardness of the crystals were also studied. Especially the zinc doped aluminium single crystals showed a various hardness according to the impurty doping rate.
진광수 부산대학교 1987 자연과학논문집 Vol.44 No.-
This paper deals with the growth of Cu single crystals by Bridgman technique and Cu crystals diffused with Zn. Observations were made on the (100) and (111) surfaces of the Cu single crystals and the boundaries of the Cu crystals diffused with Zn. Their hardnesses and electrical resistivities were also studied.
Hot-Press法으로 제작된 B_(a)T_(i)O₃ Ceramics의 電氣的 性質
陳光守 부산대학교사범대학 1977 교사교육연구 Vol.4 No.2
The effects of Mn and Fe which were doped in the B_(a)T_(i)O_(3) ceramics, were investigated on its electric properties, with 30, 3, 0.3 and 0.03 mole% respectively. We found that dielectric constants decreased as the Fe mole% increased and that the Curie point of the 30 mole% Fe doped in the B_(a)T_(i)O_(3) ceramics were shown float peak. The hot-press sintering condition of the B_(a)T_(i)O_(3) ceramics which was doped 30 mole % Fe was determined with 1200℃-64㎏/㎠-4hrs. The electric properties of these hot-pressed B_(a)T_(i_O_(3) ceramics were different form its properties of the non-hot-pressed the same ceramics.