Enhancement quality factor by Zr +4 substitution at B-site of ZnNiTiO 4 microwave ceramics

Chen, Yih-Chien; Syu, Ruei-Yang; Ding, Xing-Fu

doi:10.1016/j.ceramint.2017.05.202

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Accordingly, the study of high-performance and stable microwave dielectric materials has become a current task. Microwave dielectric ceramics are widely used as indispensable electronic components because of their high dielectric constant (ε r ), high-quality factor (Q × f ), and low-temperature coefficient of resonant frequency (τ f ) [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

Xiao

Deng

et al. 2023

Molecules

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Ba1−xSrx(Zn1/3Nb2/3)O3 (BSZN) perovskite ceramics are prepared using the traditional solid-state reaction method. X-ray diffraction (XRD), Scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used to analyze the phase composition, crystal structure, and chemical states of BSZN ceramics, respectively. In addition, the dielectric polarizability, octahedral distortion, complex chemical bond theory, and PVL theory were investigated in detail. Systematic research showed that Sr2+ addition could considerably optimize the microwave dielectric properties of BSZN ceramics. The change in τf value in the negative direction was attributed to oxygen octahedral distortion and bond energy (Eb), and the optimal value of 1.26 ppm/°C was obtained at x = 0.2. The ionic polarizability and density played a decisive role in the dielectric constant, achieving a maximum of 45.25 for the sample with x = 0.2. The full width at half-maximum (FWHM) and lattice energy (Ub) jointly contributed to improving the Q × f value, and a higher Q × f value corresponded to a smaller FWHM value and a larger Ub value. Finally, excellent microwave dielectric properties (εr = 45.25, Q × f = 72,704 GHz, and τf = 1.26 ppm/°C) were obtained for Ba0.8Sr0.2(Zn1/3Nb2/3)O3 ceramics sintered at 1500 °C for 4 h.

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Section: Introductionmentioning

confidence: 99%

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

Xiao

Deng

et al. 2023

Molecules

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La(Mg0.5−xMexSn0.5)O3-based (Me = Ca, Sr) dielectric resonator antenna for use in a wireless high-temperature sensor

Chen

You

2019

J. Ceram. Soc. Japan

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The microwave dielectric properties of La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics are studied, in order to develop a wireless dielectric resonator antenna temperature sensor. The microwave dielectric properties of La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics are determined using X-ray diffraction patterns, Rietveld refinement patterns, Raman spectra, and by observing the microstructures. La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics are prepared using a conventional solid state method. As the degree of substitution of Ca 2+ and Sr 2+ increases, the position of the A 1g (O) Raman mode shifts toward a lower frequency. The La(Mg 0.4 Ca 0.1 Sn 0.5)O 3 ceramic exhibits a minimum full width at half maximum for the A 1g (O) Raman vibration mode in the series of La(Mg 0.5¹x Me x Sn 0.5)O 3 (Me = Ca, Sr) ceramics. La(Mg 0.49 Ca 0.01 Sn 0.5)O 3 ceramics that were sintered at 1600°C for 4 h have an apparent density of 6.57 g/cm 3 , a dielectric constant (¾ r) of 19.9, a quality factor (Q©f) of 94,300 GHz, and a temperature coefficient at the resonant frequency (¸f) of ¹87 ppm/°C. The development process and test results for a dielectric resonator antenna temperature sensor that uses La(Mg 0.49 Ca 0.01 Sn 0.5)O 3 ceramics are recorded. The resonant frequency is 9.35 GHz and the 3 dB bandwidth measured at room temperature is 6.4 MHz. A sensitivity of ¹1.03 MHz/°C is achieved.

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Enhancement quality factor by Zr +4 substitution at B-site of ZnNiTiO 4 microwave ceramics

Cited by 2 publications

References 16 publications

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

Crystal Structure, Chemical Bond, and Microwave Dielectric Properties of Ba1−xSrx(Zn1/3Nb2/3)O3 Solid Solution Ceramics

La(Mg<sub>0.5−</sub><i><sub>x</sub></i>Me<i><sub>x</sub></i>Sn<sub>0.5</sub>)O<sub>3</sub>-based (Me = Ca, Sr) dielectric resonator antenna for use in a wireless high-temperature sensor

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