摘要
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-xAlxO4(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-xAlxO4.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4A2(F)→4T1(P)和Cr3+的4A2g→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 color performance,nanoscaled spinel solid solution CoCr2-xAlxO4（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 color spectrometer 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-xAlxO4 with 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 of octahedron group and the complex vibration of octahedron and tetrahedron group.Absorption bands at 570,610 and 660 nm in the visible region of UV-Vis curve are assigned to the 4A2（F）→4T1（P） of Co2＋ and 4A2g→4T2g of Cr3＋.Color spectrometer characterization results indicate that the sample exhibits best color performance with x=0.2,showing a bright bluish green color.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期285-289,共5页
Journal of Inorganic Materials
基金
国家自然科学基金(90305008)~~
