光谱学与光谱分析, 2018, 38 (9): 2676, 网络出版: 2018-10-02  

低温燃烧合成法制备的氧化铝陶瓷粉体的发光特性

The Luminescence Characteristics of Alumina Ceramic Powder by the Low Temperature Combustion Synthesis
作者单位
新疆大学物理科学与技术学院, 新疆 乌鲁木齐 830046
摘要
α-Al2O3∶C单晶具有优良的热释光特性, 被用做热释光剂量计, 但α-Al2O3∶C晶体剂量计的形状不易加工, 生产成本高且碳在晶体中难以掺杂均匀。 采用低温燃烧合成法以无水乙醇为溶剂, 尿素为染料, 硝酸铝为反应物制备少团簇、 分散均匀的片状α-Al2O3∶C陶瓷粉体。 探讨不同点火温度和不同退火温度对其光致发光特性的影响, 不同退火温度对热释光特性的影响以及热释光与辐射剂量(90Sr β)的关系。 通过分析α-Al2O3∶C陶瓷粉体的光致发光光谱得出: α-Al2O3∶C陶瓷粉体的发射波长在395 nm附近, 点火温度T≤800℃时, 点火温度为500 ℃制备的α-Al2O3∶C陶瓷粉体的光致发光强度最强; 在相同点火温度T=500 ℃下, 经不同温度退火制备α-Al2O3∶C陶瓷粉体, 点火温度为500 ℃制备的α-Al2O3∶C陶瓷粉体经1 000 ℃退火后光致发光强度最强。 通过分析α-Al2O3∶C陶瓷粉体的热释光曲线得出: 退火后的α-Al2O3∶C陶瓷粉体在200 ℃左右的热释光峰值占主导, 900 ℃退火的α-Al2O3∶C陶瓷粉体在200 ℃附近的热释光峰值最强; 通过峰高法对900 ℃高温退火处理后的α-Al2O3∶C陶瓷粉体位于200 ℃左右的热释光峰做剂量响应曲线, 可以看出, 在1~50 Gy剂量范围内具有良好的热释光剂量线性响应关系, 在50~200 Gy剂量范围内出现超线性响应关系。 与α-Al2O3∶C晶体(1~10 Gy)和多孔Al2O3∶C薄膜(1~10 Gy)相比, α-Al2O3∶C陶瓷粉体的线性剂量响应范围明显扩大。 此研究可为提高氧化铝陶瓷粉体的热释光性能提供思路。
Abstract
α-Al2O3∶C crystals possess high thermoluminescence (TL) sensitivity and have been widely used as thermoluminescence dosimeters, however, α-Al2O3∶C crystals dosimeter’s shape is not easy to process, the crystals growth requires sophisticated laboratories, high temperatures and highly reducing atmosphere and their manufacturing cost is high. Furthermore, carbon is difficult to dope evenly in crystals. In this paper, flaky α-Al2O3∶C ceramic powder with uniform dispersion and few clusters are prepared by using the low temperature combustion synthesis method, with aluminum nitrate as reactant, urea as dye, anhydrous ethanol as solvent. We have investigated the influence of ignition temperature and annealing temperature on photoluminescence (PL) as well as TL characteristics of α-Al2O3∶C ceramic powder and discussed the TL dose response. Through analyzing the photoluminescence spectra of α-Al2O3∶C ceramic powders, it was found that the emission wavelength of α-Al2O3∶C ceramic powder is about 395 nm. When the ignition temperature T≤800 ℃, the PL intensity of α-Al2O3∶C ceramic powder reaches a maximum value at ignition temperature of 500 ℃. At the same ignition temperature T=500 ℃, α-Al2O3∶C ceramic powders were prepared by annealing at different temperatures. The results show that α-Al2O3∶C ceramic powder prepared at the ignition temperature of 500 ℃ has the greatest PL intensity after annealing at 1 000 ℃. Through the analysis on the thermoluminescence curve of α-Al2O3∶C ceramic powder, it can be seen that the sample annealed at 900 ℃ has the greatest TL glow peak at ~200 ℃. The dose response curve is made for the sample annealed at 900 ℃ by peak height method through selecting the dominant thermoluminescence peak at about 200 ℃. It was found that the TL response of the α-Al2O3∶C ceramic powders annealed at 900 ℃ shows excellent linear characteristic within a dose range of 1~50 Gy, but shows super-linear behavior in a dose range of 50~200 Gy. Compared with α-Al2O3∶C crystal (1~10 Gy) and porous alumina membranes (1~10 Gy), TL response of α-Al2O3∶C ceramic powder shows a wider range of linear dose response. This study will provide a way to improve the thermoluminescence properties of alumina ceramic powder.

皇环环, 王倩, 吴丽, 李梦晓. 低温燃烧合成法制备的氧化铝陶瓷粉体的发光特性[J]. 光谱学与光谱分析, 2018, 38(9): 2676. HUANG Huan-huan, WANG Qian, WU Li, LI Meng-xiao. The Luminescence Characteristics of Alumina Ceramic Powder by the Low Temperature Combustion Synthesis[J]. Spectroscopy and Spectral Analysis, 2018, 38(9): 2676.

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