Abstract
Photoacoustic (PA) spectroscopy is applied to study the optical absorption of ceramic ZnO doped with 1 mol% Bi2O3 sintered at different temperatures (700–1100° C). PA signal intensities plotted semilogarithmically reveal two individual regions below 3.0 eV (A: 3.0–2.7 eV; B: 2.6–2.4 eV). The steepness factor (slope of exponential optical absorption) obtained at region A decreases with increasing sintering temperature, indicating an increase of Bi2O3 segregation at particle surfaces and grain boundaries. The steepness factor at region B increases rapidly with increasing sintering temperature, indicating an occurrence of structure ordering (decrease of defect states) by the Bi2O3 liquid phase sintering effect.
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