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系统测量了不同颗粒尺度纳米 SnO_2固体的内耗和模量,发现60℃附近存在一个内耗峰,对应的模量出现异常.烧结温度升高,峰高变化不明显,模量异常减弱.当烧结温度高于400℃时,模量曲线在-15℃附近出现异常,这种模量异常随烧结温度升高而加强,对应的内耗曲线出现一小峰.初步认为,60℃附近内耗峰和模量异常与纳米固体中的结构再有序有关,而-15℃处的模量异常为结构相变引起.
The internal friction and modulus of nanostructured SnO_2 nanocrystals with different particle sizes were measured and found that there was an internal friction peak near 60 ℃ and the corresponding modulus was abnormal.The sintering temperature was increased while the peak height was not obvious and the modulus was abnormally decreased.When the sintering temperature When the temperature is higher than 400 ℃, the modulus curve appears abnormal near -15 ℃, and this modulus anomaly increases with the increase of sintering temperature, and the corresponding internal friction curve shows a small peak.It is preliminarily believed that the internal friction peak and modulus at 60 ℃ are abnormal Which is related to the orderly structure of nanocrystals. The anomalous modulus at -15 ℃ is caused by the structural phase transition.