Jpn. J. Appl. Phys. 43 (2004) pp. 2936-2939  |Previous Article| |Next Article|  |Table of Contents|
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Photoacoustic Spectra from Co Doped ZnO with Different Grain or Cluster Sizes

Yoshihiro Inoue, Yoshiko Miyauchi, Akitsugu Kimura, Toshio Kawahara, Yoichi Okamoto and Jun Morimoto

(Received November 21, 2003; revised January 21, 2004; accepted February 4, 2004; published May 28, 2004)

Photoacoustic (PA) spectra for Zn_1-xCo_xO mixed-crystal powders with various Co concentrations and sintering temperatures were measured. The PA spectra showed three peaks of Co²⁺ absorption between 560 nm and 660 nm. On the other hand, the PA spectra between 800 nm and 1000 nm were almost flat, and these are expected to be dominated by light scattering effects. The PA spectra were normalized by using the Co²⁺ absorption peaks in order to compare the sample size and the PA signals intensity, and the sintering temperature dependence of the PA spectra is discussed. The PA signal intensity decreased with the increase of the sintering temperature. The decrease of the PA spectra seems to be caused by small light scattering effects for the large clusters under higher temperature sintering, where the grains and clusters size increase. We could evaluate the grain growth in the sintering processes by PA spectroscopy in a noncontact mode.

URL: http://jjap.jsap.jp/link?JJAP/43/2936/
DOI: 10.1143/JJAP.43.2936

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