A study on the influence and mechanism of the microstructure of tourmaline crystal on its piezoelectricity
Tourmaline is a kind of non-central symmetric crystal with complex chemical composition and structure.It has piezoelectricity.At present,the influence of internal microstructures in tourmaline on its piezoelectricity has rarely been researched.In order to deeply explore the influence of internal microstructures in tourmaline on its piezoelectricity,the relationships between internal microstructure factors(bond length,bond angle)and piezoelectricities of elbaite and dravite have been explored in the study.Based on the piezoelectricity test of tourmaline and the X-ray diffraction test of tourmaline single crystal,we have calculated the distortion parameters of the crystal structure and the inherent electric dipole moments,and have analyzed the relationship between the piezoelectricity of tourmaline and the microstructures within tourmaline crystal.It was found that the cation radiuses of dominant elements in the Y position of tourmaline affected distortion parameters of the bond length and bond angle of the Y polyhedron,affected the distortion degree of the Y polyhedron,further affected the distortion of other polyhedrons in tourmaline crystal,and finally resulted in the intensity change of piezoelectricity of tourmaline.The results show that tourmaline with relatively high Li content has relatively high distortion parameters of the Y polyhedron and relatively strong piezoelectricity.In addition,due to the structure rotating symmetrically around the c-axis of tourmaline,the inherent electric dipole moments provided in directions of the a-axis and the b-axis are offset,resulting in that the piezoelectricity of the c-axis direction was much stronger than those of the a-axis and b-axis for the same kind of tourmaline,.It was also found that the piezoelectric intensity of tourmaline was positively correlated with the inherent electric dipole moment of tourmaline,indicating that it is meaningful to use the inherent electric dipole moment for studying the piezoelectricity of tourmaline.This study provided a new idea for exploring the influence mechanism of microstructure on the piezoelectricity intensity of natural minerals or man-made materials by using the structural parameter calculation.
tourmalinepiezoelectricitycrystal microstructureX-ray diffraction of single crystal
薛景源、董发勤、周琳、张伟、陈禹衡、郑飞、郭铭、Kotova Elena Leonidovna
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西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳 621010
西南科技大学环境与资源学院,四川绵阳 621010
西南科技大学分析测试中心,四川 绵阳 621010
Mining Museum,St.Petersburg Mining University,Russia St Petersburg 199106
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