压电晶体YbBa_(3)(PO_(4))_(3)的生长与性质表征

Growth and Property Characterization of Novel Piezoelectric Crystal YbBa_(3)(PO_(4))_(3)

压电材料在振动传感器、压力传感器和超声波压电换能器等器件技术领域有着广泛应用,探索新型压电晶体材料用于特种压电传感器件的研发具有重要意义。本文利用传统的提拉法生长出具有高熔点(~1800℃)的磷酸钡镱(YbBa_(3)(PO_(4))_(3),YbBP)新型压电晶体。X射线衍射分析表明,该晶体属于立方晶系I 43d空间群,晶胞参数为a=b=c=1.0435 nm。研究发现,该晶体沿垂直于(013)晶面的方向更容易生长。摇摆曲线半峰全宽测得为60.6″,表明生长的晶体具有较高的结晶品质。采用LCR电桥法、阻抗法和超声法测算了该晶体的相对介电常数和压电应变常数,得到晶体的相对介电常数ε11和压电应变常数d14分别为15.3和11.4 pC/N。该晶体不仅具有较好的压电性能,同时具有纯的面切变振动模态,表明该晶体在压电传感技术领域具有潜在应用。

Piezoelectric materials are widely used in vibration sensors,pressure sensors and ultrasonic piezoelectric transducers etc.It is of great significance to explore novel piezoelectric crystal materials for using in special piezoelectric sensor devices.Herein,a novel non-centrosymmetric barium ytterbium phosphate(YbBa_(3)(PO_(4))_(3),YbBP)piezoelectric crystal with high melting point(~1800℃)was grown by traditional Czochralski method.The single crystal X-ray diffraction shows that this crystal belongs to the cubic symmetry with the space group of I43d and lattice parameters of a=b=c=1.0435 nm.It is found that the YbBP single crystal is easier to grow along the direction perpendicular to the(013)facet.High resolution X-ray diffraction was carried out to evaluate the crystalline quality.The full width at half-maximum of rocking curves is 60.6″,indicating that the grown YbBP single crystal shows good quality.Moreover,the dielectric permittivity and piezoele ctric constant were evaluated by using the LCR bridge method,impedance and ultrasonic methods.The relative dielectric permittivity(ε11)and piezoelectric strain constant(d14)of YbBP crystal are 15.3 and 11.4 pC/N,respectively.The YbBP crystal not only possesses large piezoelectric performance but also has pure face-shear vibration mode,indicating the potentials of this crystal for piezoelectric sensing application.