Effects of Bi_2O_3 Impurities in Ceramic ZnO on Photoacoustic Spectra and Current-Voltage Characteristics
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概要
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Photoacoustic (PA) spectroscopy is applied to study the optical absorption of ceramic ZnO doped with 1 mol% Bi_2O_3 sintered at various temperatures (700-1100℃). 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 as the sintering temperature increases, indicating an increase of Bi_2O_3 segregation at particle surfaces and grain boundaries which might contribute to the interface states. The steepness factor at region B increases rapidly as the sintering temperature increases, indicating an occurrence of structural ordering by the Bi_2O_3 liquid phase sintering effect. The varistor effect (highly nonohmic behavior in the current-voltage characteristics) of ceramic ZnO doped with 1 mol% Bi_2O_3 is correlated with the characterization obtained by the PA method.
- 社団法人応用物理学会の論文
- 1998-05-30
著者
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Toyoda Taro
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Shimamoto Satoshi
Department Of Applied Physics And Chemistry The University Of Electro-communications
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