ZrO2와 Y2O3 조성비에 따른 Co와 Ce 첨가 큐빅지르코니아(YSZ) 단결정의 광 학적 및 구조적 특성
The optical and structural properties by ZrO2 and Y2O3 compositional ratio of Co- and Ce-doped cubic zirconia (YSZ) single crystals
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초록
스컬용융법으로 큐빅지르코니아(YSZ) 단결정들(ZrO2: Y2O3= 80 : 20, 70 : 30, 60 : 40, 50 : 50 wt%, Co3O4: 0.8wt%,CeO2: 0.4wt%)을 성장시켜 N2 분위기 1000oC에서 5시간 동안 열처리 하였다. 오랜지색, 황갈색 또는 갈색의 단결정들은각각 갈적색, 황색 또는 녹색으로 변화되었다. 열처리 전·후의 YSZ 단결정들은 직경 6.5, 두께 2 mm의 웨이퍼로 연마 하였다. 각 시편의 광학적 또는 구조적 특성은 UV-VIS 분광광도계와 XRD(X-ray diffraction)로 분석하였으며, Ce3+(2F5/2, 7/2(4f)→ 2Tg(5d1)), Co2+(4A2(4F) → 4T1(4F) 또는 4T1(4P)) 및 Co3+에 의한 흡수, 이온화에너지 및 격자상수 변화를 확인하였다.
Abstract
Co-(0.8 wt%) and Ce-(0.4 wt%) doped cubic zirconia (ZrO2 : Y2O3 = 80 : 20, 70 : 30, 60 : 40, 50 : 50 wt%) single crystals grown by a skull melting method were heat-treated in N2 at 1000oC for 5 hrs. The orange, yellowish brown and brown colored as-grown single crystals were changed into either brownish red, yellow and green color after the heat treatment. Before and after the heat treatment, the YSZ (yttria-stabilized zirconia) single crystals were cut for wafer form (φ6.5 mm × t2 mm). The optical and structural properties were examined by UV-VIS spectrophotometer and X-ray diffraction. Absorption by Ce3+(2F5/2, 7/2(4f) → 2Tg(5d1)), Co2+(4A2(4F) → 4T1(4F) or 4T1(4P)) and Co3+, change of ionization energy and lattice parameter were confirmed.
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