• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2007년도 제34회 시멘트 심포지엄
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• pp.7-18
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• 2007

• 세라미스트
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• 제15권5호
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• pp.47-55
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• 2012

• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2004년도 춘계총회 및 연구발표회 초록집
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• pp.39.3-39.3
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• 2004

• 세라미스트
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• 제13권2호
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• pp.56-62
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• 2010

• 세라미스트
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• 제13권2호
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• pp.32-40
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• 2010

• 세라미스트
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• 제13권2호
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• pp.47-55
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• 2010

• 세라미스트
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• 제12권4호
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• pp.7-17
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• 2009

See Full Text

• 세라미스트
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• 제12권4호
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• pp.26-33
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• 2009

• 세라미스트
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• 제12권4호
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• pp.61-69
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• 2009

• 한국재료학회지
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• 제32권9호
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• pp.379-383
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• 2022

In this study, Barium Germanium glasses were prepared with a composition of xBaO-(72-x)GeO₂-8La₂O₃-20ZnO where x = 16.0, 18.0, 20.0, 22.0 and 24.0 mol% respectively. Their physical and optical properties, such as refractiveness index, glass transition temperature (T_g), softening temperature (T_s), transmittance and Knoop hardness were studied. The results showed that refractive index, T_g, T_s and coefficient of thermal expansion (CTE) increased with increasing BaO concentration. The refractive index of all the prepared samples was observed between 1.7811 to 1.7881. The Abbe number was calculated by formula using n_d (589.3 nm), n_f (656.3 nm) and n_c (486.1 nm) and observed to be between 38 to 40. The Abbe number of the prepared sample was similar to that of BaO and GeO₂. The transmittance of the prepared glasses was observed to be between 80 ~ 82 % throughout the range from 200 nm to 800 nm. Knoop hardness divided into seven steps were measured 5 class (≥ 450 ~ < 550) of all prepared samples.