Effect of Excess Li+ on Microwave Dielectric Properties of Ca0.16Sr0.04Li0.4Nd0.4TiO3 Ceramics

Yuan, Changlai; Chen, Guohua; Zhou, Changrong; Yang, Yun; Peng, Fuwei

doi:10.1111/ijac.12228

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…Based on impedance spectroscopy analysis, D. C. Sinclair et al found that the grain shells and cores had contribution to the microwave dielectric properties and dielectric loss in the BaCo 1/3 Nb 2/3 O 3 ceramics . In the Ca 0.16 Sr 0.04 Li 0.4 Nd 0.4 TiO 3 ceramics, impedance analysis indicated that the grain regions showed the inhomogeneity in electrical properties and dielectric loss of the ceramic system were mainly derived from the semiconducting grain cores . The impedance spectroscopy was employed to establish the electrical microstructure of CaCu 3 Ti 4 O 12 ceramics and had shown them to be electrically inhomogeneous, containing semiconducting grains with insulating grain‐boundary regions .…”

Section: Introductionmentioning

confidence: 99%

Complex impedance spectroscopy of perovskite microwave dielectric ceramics with high dielectric constant

et al. 2018

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The AC impedance of SrTiO3, Ca0.9Sr0.1TiO3, Ca0.7Sm0.2TiO3, and Ca0.7Sm0.3Ti0.7Al0.3O3 microwave dielectric ceramics with perovskite structures has been analyzed. The impedance spectroscopy results reveal the electrical properties of this series of samples vary significantly with the ceramic microstructure and electrical homogeneity. The εr values of grains for SrTiO3 and Ca0.9Sr0.1TiO3 ceramics are 193.8 and 138.1, respectively, confirming that dielectric response of the high‐εr microwave ceramics is contributed to the grains, at microwave frequencies. Impedance spectroscopy of Ca0.7Sm0.2TiO3 ceramic illustrates that electrical heterogeneous microstructures include interior grains and grain shells. The secondary phase existing in Ca0.7Sm0.2TiO3 ceramic causes deviation in bulk permittivity, resulting in a higher εr ~ 148 of grains than εr ~ 112 of bulk permittivity, measured at microwave frequencies. Grain and grain‐boundary impedance of Ca0.7Sm0.3Ti0.7Al0.3O3 ceramic cannot be separated completely. The permittivities of grains and grain boundaries in Ca0.7Sm0.3Ti0.7Al0.3O3 ceramic are εg ~ 17.8 and εgb ~ 20.8, and the combination of them is close to εr ~ 40 at microwave frequencies. The LogI−LogU curves of the ceramic system indicate that the conducting mechanism of grains and grain boundaries follows ohmic behavior.

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Section: Introductionmentioning

confidence: 99%

Complex impedance spectroscopy of perovskite microwave dielectric ceramics with high dielectric constant

et al. 2018

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List of Low‐Loss Ceramic Dielectric Materials and Their Properties

2017

Microwave Materials and Applications 2V Set

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AbbreviationsST = sintering temperature ( • C) r = relative permittivity , f = measurement frequency (GHz) f = coefficient of temperature variation of resonant frequency (ppm/ • C) No. = serial number Qf = quality factor frequency product (GHz)The table lists the key property data of microwave dielectric materials available from published materials. These data are the relative permittivity ( r ), the product of the Q-factor and the frequency (Qf ), the frequency of measurement (f), and the temperature coefficient of the resonant frequency ( f ). In tabulating these data, we make no judgment on the measurement method and the reliability of the result. It is known that the ceramic properties such as porosity, grain size, raw materials used, impurities, measurement methods, and equipment used for measurements affect the dielectric properties and readers should be aware that exact comparison of data on materials of identical composition and manufactured in different laboratories using different processing conditions and measured by different methods would be expected to lead to small variations in properties. The data of dielectric measurements carried out using impedance methods at low (MHz) frequency is excluded as the errors in these methods mean that a loss tangent less than 10 −3 is unreliable. The data are arranged in the order of increasing relative permittivity. The quality factor of the microwave dielectric ceramics decrease significantly with increasing relative permittivity, as shown in Figure A.1. The inset in the figure shows the variation of quality factor frequency product with Microwave Materials and Applications, First Edition. Edited by Mailadil T. Sebastian, Rick Ubic and Heli Jantunen.

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Effects of Bi3+ substitution on microwave dielectric properties of (Ce1−x Bi x )0.2Sr0.7TiO3 ceramics

Wang

Yuan

et al. 2017

J Mater Sci: Mater Electron

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Effect of Excess Li⁺ on Microwave Dielectric Properties of Ca_0.16Sr_0.04Li_0.4Nd_0.4TiO₃ Ceramics

Cited by 4 publications

References 27 publications

Complex impedance spectroscopy of perovskite microwave dielectric ceramics with high dielectric constant

Complex impedance spectroscopy of perovskite microwave dielectric ceramics with high dielectric constant

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

Effects of Bi3+ substitution on microwave dielectric properties of (Ce1−x Bi x )0.2Sr0.7TiO3 ceramics

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