天然热释电材料电气石的微结构及对水的pH值影响机理的研究

Study on the microstructure of natural tourmaline and mechanism of its influence on pH value of water

以新疆产天然电气石为原料制备了电气石微粉,利用X射线衍射仪、扫描电镜、高分辨电镜、pH酸度计研究了电气石的物相、微结构特点和电气石对水酸度及其随温度变化的影响。结果表明,电气石单个微粒为单畴的铁电体,可视为电偶极子;利用电气石微粉可以使水的酸度呈弱碱性;电气石对水酸度的影响随温度的变化进一步佐证了电气石的热释电性,并探讨了电气石对水作用的可能机理。

Micro-nano tourmaline powder was prepared by using natural Xinjiang tourmaline single crystals as materials The powder was characterized by XRD, SEM and HRTEM. The effect of tourmaline on pH value of water as well as the relationship of pH value vs temperature were studied. The results showed that the micronano tourmaline particle is actually a single domain ferroelectrie crystal, which could be regarded as an electric dipole. The addition of the tourmaline powder in water leads to a change in pH value from neutral to alkalescency. In addition, the change of water acidity is proportional to the temperature variation of above solution, which provided the direct evidence for the pyroelectricity of tourmaline. The possible mechanism of tourmaline influence on water was proposed based on our current data.