Influence of Sr/Hf ratio and annealing treatment on structural and scintillating properties of sol–gel Ce3+-doped strontium hafnate powders
| Autor: | Jacques Mugnier, Stephane Parola, C. Le Luyer, Christophe Dujardin, M. Villanueva-Ibañez |
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| Rok vydání: | 2005 |
| Předmět: |
Strontium
Materials science Annealing (metallurgy) Strontium carbonate Organic Chemistry chemistry.chemical_element Infrared spectroscopy Atomic and Molecular Physics and Optics Fourier transform spectroscopy Electronic Optical and Magnetic Materials Hafnium Inorganic Chemistry Cerium chemistry.chemical_compound chemistry Electrical and Electronic Engineering Physical and Theoretical Chemistry Spectroscopy Nuclear chemistry Sol-gel |
| Zdroj: | Optical Materials. 27:1541-1546 |
| ISSN: | 0925-3467 |
| Popis: | Rare-earth-doped SrHfO3 has recently received great attention due to its potentiality as scintillating material. In this study, cerium (1 mol%)-doped strontium hafnate powders are elaborated using the sol–gel process. Different strontium/hafnium molar ratios and different annealing temperatures are investigated to follow the structural behaviour of the powder using X-rays diffraction, micro Raman spectroscopy and Fourier transformed infrared spectroscopy. The analyses are conducted on powders heat-treated up to 1200 °C. If the starting solution contains a strontium/hafnium ratio that equal or less to ≈1, the powders crystallize into a mixture of both HfO2 and SrHfO3 phases after heat treatment at high temperature. SrHfO3 powder is obtained for the molar ratio of the starting solution Sr/Hf = 1.22 and heat treatment up to 1000 °C. Strontium carbonate is observed when powders are elaborated with large excess of strontium whatever annealing temperature. The best scintillation efficiency is obtained using a starting solution with an equimolar ratio and a powder heat-treated at 1200 °C. |
| Databáze: | OpenAIRE |
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