Measured displacement energies of oxygen ions in titanates and zirconates

• Published in: Journal of nuclear materials Vol. 321; no. 1; pp. 19 - 28
• Main Authors: Smith, Katherine L, Colella, Michael, Cooper, Ronald, Vance, Eric R
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.09.2003; Elsevier
• Subjects: Earth sciences; Earth, ocean, space; Exact sciences and technology; Mineralogy; Non silicates; C0300; 61.72.Ji; E0200; 78.60.Hk; R0100; W0200; 61.80.Fe; 61.82.Fk; intensity; niobates; luminescence; oxides; titanium; temperature; emission spectra; zirconium; zirconolite; energy
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/S0022-3115(03)00197-1

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.