Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Color-change for ligand field of cobalt doped yttria stabilized cubic zirconia (YSZ) single crystal

Cobalt가 첨가된 이트리아 안정화 큐빅지르코니아(YSZ) 단결정의 리간드장에 따른 색상변화

  • Seok, Jeong-Won (Department of Gemological Engineering, dongshin University) ;
  • Choi, Jong-Koen (Department of Gemological Engineering, dongshin University)
  • 석정원 (동신대학교 보석공학과) ;
  • 최종건 (동신대학교 보석공학과)
  • Published : 2007.02.28
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Abstract

Cobalt ($Co^{2+}$) doped yttria stabilized cubic zirconia (YSZ, $Y_2O_3\;:\;25{\sim}50wt%$) single crystals grown by a skull melting method were heat-treated in $N_2\;at\;1000^{\circ}C$ for 5 hrs. The reddish brown single crystals were changed into either violet or blue color, respectively. Before and after heat treatment, the Co-doped YSZ crystals cut for wafers (${\phi}6.5{\times}t\;2mm$) and round brilliant (${\phi}10mm$). The optical and structural properties were examined by UV-VIS spectrophotometer and XRD. These results are analyzed absorption by $Co^{2+}\;(^4A_2(^4F)\to{^4P})\;and\;Co^{3+}$, change of energy gap and lattice parameter.

스컬(skull)용융법에 의해 성장시킨 코발트($Co^{2+}$)가 도핑(doping)된 $25{\sim}50wt%$의 서로 다른 $Y_2O_3$ 함량을 가진 이트리아 안정화 큐빅지르코니아(YSZ) 단결정을 $N_2$ 분위기 $1000^{\circ}C$에서 5시간 동안 열처리하였다. 적갈색의 단결정들은 각각 보라색 또는 청색으로 변화되었으며, Co가 첨가(doping) 된 처리 전 후의 YSZ들은 직경 6.5, 두께 2 mm의 웨이퍼 또는 직경 10 mm의 라운드브릴리언트 컷(round brilliant cut)으로 연하 하였으며, 광학적 또는 구조적 특성은 UV-VIS 분광광도계와 XRD(X-ray diffraction)로 측정하였으며, $Co^{2+}\;(^4A_2(^4F)\to{^4P})$ 및 $Co^{3+}$에 의한 흡수, 에너지 간격(energy gap) 및 격자 매개 변수(lattice parameter)변화가 분석되었다.

Keywords

References

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