Co와 Ce를 첨가한 큐빅지르코니아(YSZ) 단결정의 이온화에너지 및 격자상수
The ionization energy and lattice parameters of Co- and Ce-doped cubic zirconia (YSZ) single crystal
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초록
스컬용융법으로 큐빅지르코니아(YSZ) 단결정들(ZrO2: Y2O3: Co3O4: CeO2= 64 : 36 : 0.5 : 0~0.3mol%)을 성장시켜 N2 분위기 1200oC에서 3시간 동안 열처리 하였다. 갈색의 단결정들은 각각 녹색 또는 청색으로 변화되었다. 열처리 전·후의 YSZ 단결정들은 직경 7, 두께 2 mm의 웨이퍼 또는 직경 12 mm의 라운드브릴리언트 컷으로 연마 하였다. 각 시편의광학적 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-(0.5 mol%) and Ce-(0~0.3 mol%) doped cubic zirconia (ZrO2 : Y2O3 = 64 : 36 mol%) single crystals grown by a skull melting method were heat-treated in N2 at 1200oC for 3 hrs. The brown-colored as-grown single crystals were changed into either green or blue color after the heat treatment. Before and after the heat treatment, the YSZ (yttriastabilized zirconia) single crystals were cut for wafer form (φ7 mm × t2 mm) and round brilliant cut (φ12 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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