Abstract
Recently, the need has arisen to enhance the piezoelectric properties and temperature stability of (Na,K)NbO3 system ceramics. The (0.965)(Li0.03(Na0.5K0.5)0.97)(Nb1−xSbx)O3−0.035 (Bi0.5Na0.5)0.9(Sr)0.1ZrO3 ceramics were newly manufactured using the sintering aids of CuO, B2O3, and ZnO as a function of antimony substitution, and the their crystal structure and electrical characteristics were analyzed. The grain size was apparently refined as the amount of antimony increased. The dielectric constant was enhanced and Curie temperature was decreased due to the content of the antimony substitution. The x = 0.07 sample sintered at 1060 °C presented the best electrical characteristics, which were bulk density = 4.488 g/cm3, piezoelectric constant d33 = 330 pC/N, electromechanical coupling factor kp = 0.427, mechanical coupling factor Qm = 61, and dielectric constant εr = 2521. We believe that the x = 0.07 sample is the best material for piezoelectric speakers.
Highlights
In recent years, lead zirconate titanate ceramics have been extensively utilized in application devices such as piezoelectric actuator, ultrasonic motors, piezoelectric transformer, and ultrasonic cutters [1,2,3,4,5]
It is well-known that the morphotropic phase boundary (MPB) region with tetragonal and rhombohedral structure can enhance the piezoelectricity of the PZT ceramics, owing to the involvement of the more polarization states [14]
The surface grain size of the samples were significantly reduced with the increase of the antimony
Summary
Lead zirconate titanate ceramics have been extensively utilized in application devices such as piezoelectric actuator, ultrasonic motors, piezoelectric transformer, and ultrasonic cutters [1,2,3,4,5]. A rhombohedral-tetragonal (R-T) coexistence phase can appear Because this R-T phase transition may act to the classical morphotropic phase boundary (MPB) observed in PZT ceramics, the higher d33 may be expected [6,7,8,9,10,11,12,13]. In compositionally modified KNN ceramics, increased dielectric and piezoelectric properties can be obtained by forming the R-T Polymorphic phase transition (PPT) near room temperature. It is well-known that the MPB region with tetragonal and rhombohedral structure can enhance the piezoelectricity of the PZT ceramics, owing to the involvement of the more polarization states [14]. Piezoelectric devices have mainly utilized the ceramics close to the tetragonal and rhombohedral phase boundary
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