The Contribution of Co2+ to Blue Color of Synthetic Spinel
Through to 110 pieces purity transparent and color uniform, 3×5×7mm blue synthetic spinel made with the flame fusion method on chemical compositions and color parameter measurement the Co2+content and color changes, clear the influence on Co2+relationship of blue synthetic spinels color appearance. Through LA-ICP-MS to analysis the cause of colorant content, proof that with Co2+, the increase of the content of synthetic spinel will shift blue to purple tone, and C* shows a parabola form with the drop of L*, 700 ppm～900 ppm place in peak. △L* ∈(3.55～76.94) with Co2+e (4.59 ppm～1849 ppm) change the largest amount, △C* ∈(-9.99～29.32) next, △H* ∈ (-20.34～4.67) compared with before two changes smallest. Co2+content in l00ppm below, blue color of synthetic spinel with Co2+content increased changes greatly; 500～1500 ppm, visually achieve optimal color (C* higher); above 1500ppm, because of the Co2+overmuch make the color burn cause the overall decline of transparency, the change of L* tends to be gentle, C* decrease obviously. Use Color i5 in standard color measurement instrument lighting source D65, measured the lightness L specimen Color a and b , chroma C and tonal angle ho, based on the uniform color space CIE 1976 L*a*b, in lightness minimum L 9-10 specimen (processing data for standard to 9th), with the help of DE2000 benchmark for calculating formulas, the Color, the color difference train E* by partial correlation analysis card clearly degrees of off color changes L has certain influence on r△L*×0.996, while r△C-*×=-0.427, r△H*×△E*=-0.339. Conclusion, the bule color of synthetic spinel because of its Co2+content changes main influencing L* to contribute to its color appearance.
Ma Ye Guo Ying
School of Gemology, China University of Geosciences, Beijing, China, 100083
国际会议
长沙
英文
400-403
2011-06-30（万方平台首次上网日期，不代表论文的发表时间）