کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1816286 | 1025681 | 2006 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Neutron irradiation of Czochralski and temperature gradient technique grown YAG crystals Neutron irradiation of Czochralski and temperature gradient technique grown YAG crystals](/preview/png/1816286.png)
Absorption, fluorescence and thermoluminescence spectra are presented for 1.5-MeV neutron-irradiated YAG crystals grown by Czochralski (CZ) and temperature gradient technique (TGT). F+ centers were formed in both YAG samples and valence of iron impurities in TGT-grown YAG crystals switched from divalent to trivalent after neutron irradiation. At 350 and 300 °C thermoluminescence was observed in CZ-grown and TGT-grown YAG crystals, respectively, and assigned to irradiation-induced color centers. Calculated with the initial elevation method, thermoluminescence trap depths of the 350 °C band and of the 300 °C band are 0.379 and 0.768 eV, respectively. The significant difference in thermoluminescence intensities between CZ- and TGT-grown YAG crystals is associated with the irradiation-induced color centers and quenching effect of Fe3+ ions.
Journal: Physica B: Condensed Matter - Volume 373, Issue 1, 1 March 2006, Pages 42–45