以金属硝酸盐为氧化剂、柠檬酸为还原剂, 用低温燃烧法合成了纳米尖晶石CoCr2- xAl xO4(x=0、0.05、0.1、0.2、0.3和0.5). 用XRD、TEM、IR、紫外可见分光光度计和分光色差仪等手段表征了样品结构、形貌、红外、紫外可见吸收特性和颜色参数. 结果表明, 在800℃时即可合成单相、形貌规整的15~30 nm的CoCr2- xAl xO4. 确定了IR曲线在520和630 cm - 1 的吸收峰对应于八面体基团[CrO6]/[AlO6]的特征振动, 410~450 cm - 1 的吸收峰为四面体基团[CoO4]和八面体基团的复合振动. 由于Co2+的 4 A2(F)→4T1(P)和Cr3+的 4 A2g→4T2g跃迁, 紫外可见曲线在570、610和660 nm左右有较强的吸收. x=0.2时, 样品颜色性能最佳, 呈鲜艳的蓝绿色.
As a member of complex metal oxides, spinel CoCr2O4 has wide application in ceramic pigment, catalysis and magnetic materials. In order to reduce the Cr content and modify the colorperformance, nanoscaled spinel solid solution CoCr2- xAl xO4 ( x=0,0.05, 0.1, 0.2, 0.3 and 0.5) was synthesized by low-temperature combustion synthesis (LCS) method using citric acid (reductant) and metal nitrates(oxidants) as starting materials. XRD, TEM, FT-IR, UV-Vis spectrometer and colorspectrometer were employed to characterize the structure, morphology, infrared,ultraviolet-visible curve and the color parameters of the as-prepared sample, respectively.Results show that single-phased and uniform CoCr2- xAl xO4with about 15-30 nm in size can be prepared by LCS at 800 ℃.Absorption bands at about 520 cm - 1 , 630 cm - 1 and 410-450 cm - 1 in IR curve are corresponding to the vibration ofoctahedron group and the complex vibration of octahedron and tetrahedron group. Absorptionbands at 570, 610 and 660 nm inthe visible region of UV-Vis curve are assigned to the 4A2(F)→4T1(P)of Co2+ and 4A2g→4T2g ofCr3+. Color spectrometer characterization results indicate that the sample exhibits best color performance with x=0.2,showing a bright bluish green color.
参考文献
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