In this paper, thermogravimetric analyses, Fourier transform infrared spectra, X-ray powder diffraction, photoluminescence, electron paramagnetic resonance, and superconducting quantum interference device magnetometer are applied to observe the thermal decomposition of Zn 5 (OH) 8 Ac 2 ·2H 2 O to ZnO for understanding the origin of room temperature ferromagnetism in ZnO porous microspheres. The results show that both zinc vacancies and shallow donors induced by hydrogen may play an important role in triggering magnetic order in ZnO samples fabricated by annealing the precursor Zn 5 (OH) 8 Ac 2 ·2H 2 O at temperature above 400 °C.
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Xia et al. (2011) studied this question.
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