The crystal structure and magnetic properties of the α- Al 2 O 3 and γ- Al 2 O 3 samples were investigated. The α- Al 2 O 3 and γ- Al 2 O 3 powders have the trigonal and cubic symmetries, respectively. Moreover, the α- Al 2 O 3 powders have better crystallinity than γ- Al 2 O 3 material. A peculiar magnetic behavior in these two materials was found. The weak diamagnetic signal appeared at the temperature range between room temperature and 100 K. Moreover, both materials have antiferromagnetic-like transitions at the temperature range between 30 K and 100 K. The materials changed to paramagnetic-like behavior at the temperature lower than 30 K. Based on our studies, we did not find any superconducting diamagnetic signal at the temperature range from 300 K to 5 K.
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Liu et al. (1997) studied this question.
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