尖晶石型 CoCr2- xAl xO4 的低温燃烧合成与光谱分析

doi:10.3724/SP.J.1077.2011.00285

无机材料学报 ›› 2011, Vol. 26 ›› Issue (3): 285-289.DOI: 10.3724/SP.J.1077.2011.00285 CSTR: 32189.14.SP.J.1077.2011.00285

尖晶石型 CoCr_{2- x}Al _xO₄ 的低温燃烧合成与光谱分析

胡冬生 ,韩爱军 ,叶明泉 ,陈厚和 ,张伟

南京理工大学化工学院,南京210094

收稿日期:2010-05-28 修回日期:2010-10-02 出版日期:2011-03-20 网络出版日期:2011-02-18
作者简介:胡冬生(1986-), 男, 硕士研究生.
基金资助:
国家自然科学基金(90305008)

Preparation and Spectroscopy Analysis of Spinel CoCr_{2- x}Al _xO₄by Low-temperature Combustion Synthesis

HU Dong-Sheng, HAN Ai-Jun, YE Ming-Quan, CHEN Hou-He, ZHANG Wei

School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094,China

Received:2010-05-28 Revised:2010-10-02 Published:2011-03-20 Online:2011-02-18
Supported by:
National Natural Science Fund of China (90305008)

摘要/Abstract

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CoCr_{2- x}Al _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CoCr_{2- x}Al _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 ⁴A₂(F)→⁴T₁(P)和Cr³⁺的 ⁴A_2g→⁴T_2g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.

关键词: 尖晶石, CoCr_2-xAl_xO₄, 低温燃烧法, 光谱, 颜色参数

Abstract: 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 CoCr_{2- x}Al _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 CoCr_{2- x}Al _xO₄with about 15-30 nm in size can be prepared by LCS at 800 ℃.Absorption bands at about 520 cm ^-¹, 630 cm ^-¹and 410-450 cm ^-¹in 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 ⁴A_2g→⁴T_2gofCr³⁺. Color spectrometer characterization results indicate that the sample exhibits best color performance with x=0.2,showing a bright bluish green color.

Key words: spinel, CoCr_{2- x}Al _xO₄, low-temperaturecombustion synthesis, spectroscopy, color parameters

中图分类号:

TB321

胡冬生, 韩爱军, 叶明泉, 陈厚和, 张伟. 尖晶石型 CoCr_{2- x}Al _xO₄ 的低温燃烧合成与光谱分析[J]. 无机材料学报, 2011, 26(3): 285-289.

HU Dong-Sheng, HAN Ai-Jun, YE Ming-Quan, CHEN Hou-He, ZHANG Wei. Preparation and Spectroscopy Analysis of Spinel CoCr_{2- x}Al _xO₄by Low-temperature Combustion Synthesis[J]. Journal of Inorganic Materials, 2011, 26(3): 285-289.

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尖晶石型 CoCr_{2- x}Al _xO₄ 的低温燃烧合成与光谱分析

Preparation and Spectroscopy Analysis of Spinel CoCr_{2- x}Al _xO₄by Low-temperature Combustion Synthesis

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