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采用传统无压烧结工艺制备Mg,Ti共掺透明氧化铝陶瓷,测定了其吸收光谱、荧光光谱和激发光谱,结果表明,由于Mg2+的电荷补偿,当Ti掺入量较小时,Ti主要以Ti4+形式存在,(Mg,Ti):Al2O3透明陶瓷只在250nm的紫外波段有吸收峰,为O2-→Ti4+的电荷转移跃迁产生的吸收,并产生Ti4+离子在280—290nm和410—420nm的荧光发射峰;当Ti掺入量较大时,氧化铝透明陶瓷除了存在Ti4+的吸收峰,还表现出Ti3+离子490nm的特征吸收峰,即2T2→2E跃迁产生的宽带吸收,Ti3+离子的发射谱线与Ti:Al2O3单晶的相吻合.
The Mg, Ti co-doped transparent alumina ceramics were prepared by traditional pressureless sintering process. The absorption, fluorescence and excitation spectra of Mg, Ti co-doped transparent alumina ceramics were measured. The results show that Ti is mainly composed of Ti4 + (Mg, Ti): Al2O3 transparent ceramic has absorption peak only in the ultraviolet region of 250nm, which is the absorption produced by the charge transfer transition of O2- → Ti4 + and produces the fluorescence emission of Ti4 + ions at 280-290nm and 410-420nm Peak. When the content of Ti is larger, the transparent ceramic of Al 2 O 3 exhibits the characteristic absorption peak of 490 nm, which is the absorption band of 2T 2 → 2E, besides the Ti 4+ absorption peak. The emission spectra of Ti 3+ ion and Ti: Al2O3 single crystal phase match.