Rare-earth-free luminescent non-stoichiometric phases formed in SrO-HfO₂ ternary compositions

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• 作者：P. Boh¨¢?ek ; B. Trunda ; A. Beitlerov¨¢ ; J. Drahokoupil ; V. Jary ; V. Studni?ka ; M. Nikl
• 关键词：Solid state sintering ; Nonstoichiometric phase ; SrHfO3 ; X-ray phosphor ; Luminescence
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：15 December, 2013
• 年：2013
• 卷：580
• 期：Complete
• 页码：468-474
• 全文大小：1337 K

文摘

Non-stoichiometric strontium hafnate powder samples were prepared by reaction in solid state using the starting SrO-HfO₂ mixture with different ratios of binary constituents. XRD analysis was systematically performed and correlated with the observed radioluminescence characteristics. In the samples with starting surplus of HfO₂ a Sr_0.98Hf_1.02O_3.02 phase was identified which is associated with the 334 nm emission band. Its radioluminescence intensity exceeds more than thirty times that of bismuth germanate (BGO) standard single crystal scintillator. In the samples with initial surplus of SrO, two different Sr-rich phases were identified in the sintered material. Their radioluminescence spectra peak within 420-430 nm and intensities are comparable to that of BGO.