Measured displacement energies of oxygen ions in titanates and zirconates
Optical emission spectra in the 300–700 nm range were collected from four perovskite-structured materials (CaTiO 3, SrTiO 3, BaTiO 3 and CaZrO 3), a pyrochlore-structured material (La 2Zr 2O 7) and zirconolite (CaZrTi 2O 7), using either a Febetron 706 variable energy pulsed-electron-beam generator...
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Published in | Journal of nuclear materials Vol. 321; no. 1; pp. 19 - 28 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
01.09.2003
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Optical emission spectra in the 300–700 nm range were collected from four perovskite-structured materials (CaTiO
3, SrTiO
3, BaTiO
3 and CaZrO
3), a pyrochlore-structured material (La
2Zr
2O
7) and zirconolite (CaZrTi
2O
7), using either a Febetron 706 variable energy pulsed-electron-beam generator (pulse duration 3 ns) or a Vickers pulsed-electron LINAC (pulse duration 0.5 μs). The long-lived emissions (up to microseconds after the electron pulse) consist of broad (halfwidths ∼100 nm) bands centred around ∼400 nm. For the CaZrO
3, La
2Zr
2O
7 and CaZrTi
2O
7 samples, the emission intensity per unit dose was also measured as a function of electron beam energy over the range 0.2–0.6 MeV. The data for all three samples suggest a single stage dependence on electron beam energy. CaZrO
3, La
2Zr
2O
7, and CaZrTi
2O
7 have emission thresholds of 0.28
±
0.03, 0.27
±
0.03, and 0.26
±
0.03 MeV respectively, which give oxygen displacement values of 49
±
5, 47
±
5, and 45
±
5 eV respectively. Data collected in this study are discussed in the context of previously measured and calculated oxygen displacement values. |
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ISSN: | 0022-3115 1873-4820 |
DOI: | 10.1016/S0022-3115(03)00197-1 |