研究目的
Investigating the pseudocubic-based polymorphic phase boundary structures and their effect on the piezoelectric properties of (Li,Na,K)(Nb,Sb)O3-SrZrO3 lead-free ceramics.
研究成果
The research successfully synthesized various pseudocubic-based PPB structures in lead-free ceramics, with the tetragonal-rhombohedral PPB structure showing the best piezoelectric properties (d33=431 pC/N, kp=0.43) and good thermal stability up to 150°C. This provides insights for developing high-performance lead-free piezoelectric materials.
研究不足
The study is limited to specific compositions and sintering conditions; further investigation is needed to fully understand the phase diagram and optimize properties for broader applications.
1：Experimental Design and Method Selection:
The study used a conventional solid-state method to synthesize CuO-added
2：96(LixNa5-xK5)(Nb1-ySby)O3-04SrZrO3 ceramics with varying Li and Sb contents. Crystal structures were analyzed using X-ray diffraction (XRD) with slow-speed scanning and Rietveld refinement, transmission electron microscopy (TEM), Raman spectroscopy, and piezoelectric property measurements. Sample Selection and Data Sources:
Specimens were prepared with
3：0 ≤ x ≤ 07 and y = 055 or 065, using raw materials like Li2CO3, K2CO3, Na2CO3, Nb2O5, Sb2O5, SrCO3, and ZrOList of Experimental Equipment and Materials:
Equipment included XRD (Rigaku D/Max-RC), FE-TEM (Tecnai F20), SEM (Hitachi S-4800), Raman microscope (Thermo Fisher Scientific DXR), d33 meter (Micro-Epsilon Channel Product DT-3300), impedance analyzer (Agilent Technologies HP 4194A), LCR meter (Agilent Technologies HP 4284), and a modified Sawyer-Tower circuit. Materials were high-purity chemicals from High Purity Chemicals.
4：Experimental Procedures and Operational Workflow:
Powders were mixed, calcined, pressed into pellets, and sintered. Density was measured using Archimedes' method. XRD patterns were deconvoluted using the Voigt function. Specimens were poled with a DC field, and properties like d33, kp, and permittivity were measured at various temperatures.
5：Data Analysis Methods:
Data were analyzed using Rietveld refinement with FullProf suite, and statistical methods for property correlations.
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X-ray Diffractometer
D/Max-RC
Rigaku
Used to determine the crystal structure of the specimens by measuring XRD patterns.
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Field-Emission Transmission Electron Microscope
Tecnai F20
FEI
Used to study the crystal structure of the specimens through electron diffraction patterns and HRTEM images.
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Scanning Electron Microscope
S-4800
Hitachi
Used to investigate the microstructure of the specimens.
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Raman Microscope
DXR Raman Microscope
Thermo Fisher Scientific
Used to obtain Raman spectra for analyzing vibrational modes.
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Impedance Analyzer
HP 4194A
Agilent Technologies
Used to measure relative permittivity, loss, kp, and Qm values.
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LCR Meter
HP 4284
Agilent Technologies
Used to measure permittivity and loss as functions of temperature.
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d33 Meter
DT-3300
Micro-Epsilon Channel Product
Used to measure the piezoelectric strain constant d33 of the specimens.
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