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以Al(NO_3)_3·9H_2O、Cr(NO_3)_3·9H_2O和尿素为原料,PEG-20000为表面活性剂,采用水热法合成了铬掺杂碳酸铝铵纳米棒,经1200℃煅烧后,成功制备原位铬掺杂氧化铝纳米棒。利用XRD、SEM和FTIR对产物晶相组成、结构和形貌进行了表征,采用UV-Vis光谱和全自动测色色差计对产物的呈色性能进行测试。结果表明:铬掺杂碳酸铝铵纳米棒经1200℃煅烧后,实现了铬在氧化铝基体中的原位掺杂,两者形成了完全固溶体,固溶体晶体结构为刚玉型。随着铬掺杂量的增加,所制备的碳酸铝铵纳米棒长度变短,煅烧后的产物出现熔融现象。样品的紫外可见吸收光谱结果表明,制备的铬掺杂氧化铝基纳米粉体分别在372,406,562 nm存在较强的吸收峰,因而样品会呈现淡红色,这与全自动测色色差计测得的色度值相一致。利用水热合成原位铬掺杂氧化铝纳米棒提高了铬与氧化铝的混合均匀度,在较低温度下生成了刚玉相,有助于刚玉型耐火材料、刚玉磨料和铬铝红颜料的制备与应用。
The chromium-doped aluminum ammonium carbonate nanorods were synthesized by hydrothermal method using Al (NO_3) _3 · 9H_2O, Cr (NO_3) _3 · 9H_2O and urea as the raw materials and PEG-20000 as the surfactant. After calcination at 1200 ℃, In situ preparation of chromium-doped alumina nanorods. The crystal phase composition, structure and morphology of the product were characterized by XRD, SEM and FTIR. The colorimetric properties of the product were tested by UV-Vis spectroscopy and automatic colorimeter. The results show that chromium-doped aluminum carbonate nano-rods calcined at 1200 ℃ achieve in-situ doping of chromium in alumina matrix. Both of them form a complete solid solution and the crystal structure of solid solution is corundum type. With the increase of the amount of chromium doping, the length of the prepared aluminum carbonate nanorods becomes shorter, and the product after calcination appears a melting phenomenon. The UV-Vis absorption spectra of the samples show that the prepared chromium-doped alumina-based nano-powders have strong absorption peaks at 372, 406 and 562 nm, respectively, and thus the samples will have a light red color, which is in agreement with the measured color of the fully automatic colorimetric colorimeter Degree consistent. The hydrothermally synthesized in-situ chromium-doped alumina nanorods improve the mixing uniformity of chromium and alumina and produce corundum phases at lower temperatures, which contribute to the corundum-type refractories, corundum abrasives and chromium aluminum red pigments Preparation and application.