Quantitative evaluation of probe response functions for Raman and fluorescence bands of single-crystalline and polycrystalline Al2O3

摘要: The probe response functions of Raman and fluorescence bands single-crystalline sapphire polycrystalline Al2O3 with different grain sizes were systematically evaluated compared. As a general issue, it was found that the function strongly depended on selected signal and, more importantly, size. From comparison between characteristics bands, following could be found: (i) depth single-crystal (the main band at 417?cm?1 as paradigm sensor) about half Cr3+ doublet (a direct made R1 located 14?405?cm?1); (ii) in decreased decreasing In this latter case, up to >10 times larger than band, difference increasing These large differences geometry need taken into consideration when applying spectroscopy methods as, for example, piezo-spectroscopic stress assessments. Nevertheless, results investigation suggest noticeable improvement in-depth spatial resolution can obtained using rather probes assessing high property gradients present materials.