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    저결함 압전수정의 성장과 결함분석 = Growth of Low Defect Piezo-quartz and Defect Analysis

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    https://www.riss.kr/link?id=A100571601

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    Quartz single crystals were grown hydrothermally and growth defects such as dislocations, etch channels and impurities were examined. Growth rates were 0.25-0.65 mm/day under the growth conditions of following. 1. Mineralizer: $4wt.\%$ NaOH. 2. Growth temperature: $340-360^{\circ}C$. 3. Temperature gradient: $20-40^{\circ}C$. 4. Seed: ZY plate. 5. Nutrient: synthetic quartz. Defects of the quartz which was grown with optical grade synthetic nutrient, low dislocation density seed and horizontal seed setting technique were as follows. 1. Dislocation density: 20.0 each/$cm^2$. 2. Etch channel density: 5.0 each/$cm^2$ (1st grade by IEC 758 standard). 3. Impurity (larger than 10$\mu$) concentration: 2.4 each/$cm^3$ (Ia grade by IEC 758 standard). 4. Alpha value: 0.019 (A grade by IEC 758 standard).
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    Quartz single crystals were grown hydrothermally and growth defects such as dislocations, etch channels and impurities were examined. Growth rates were 0.25-0.65 mm/day under the growth conditions of following. 1. Mineralizer: $4wt.\%$ NaOH. 2. Growth...

    Quartz single crystals were grown hydrothermally and growth defects such as dislocations, etch channels and impurities were examined. Growth rates were 0.25-0.65 mm/day under the growth conditions of following. 1. Mineralizer: $4wt.\%$ NaOH. 2. Growth temperature: $340-360^{\circ}C$. 3. Temperature gradient: $20-40^{\circ}C$. 4. Seed: ZY plate. 5. Nutrient: synthetic quartz. Defects of the quartz which was grown with optical grade synthetic nutrient, low dislocation density seed and horizontal seed setting technique were as follows. 1. Dislocation density: 20.0 each/$cm^2$. 2. Etch channel density: 5.0 each/$cm^2$ (1st grade by IEC 758 standard). 3. Impurity (larger than 10$\mu$) concentration: 2.4 each/$cm^3$ (Ia grade by IEC 758 standard). 4. Alpha value: 0.019 (A grade by IEC 758 standard).

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