Microwave dielectric properties of (PbCa)(FeNbZr)O3 ceramics

Hu, Mingzhe; Zhou, Daoguo; Zhang, Daoli; Lu, Wen‐Zhong; Li, Buyin; Huang, Jing; Gong, Shuping

doi:10.1016/s0921-5107(02)00530-5

Cited by 15 publications

(8 citation statements)

References 8 publications

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“…The slight decrease of relative permittivity with increase in Zr contents beyond y = 0.06 can be explained by the fact that smaller (Fe 0.5 Nb 0.5 ) 4+ ions were substituted by larger Zr 4+ ions at B-sites that could not easily be displaced under the applied field, which decreased the polarizabilities of (Pb 0.45 Ca 0.55 )(Fe 0.5 Nb 0.5 ) 1Ày Zr y O 3 solid solutions. 11 The loss tangent has decreased from 0.053 for y = 0.00 to 0.014 for y = 0.15 at 1 MHz. for (Pb 0.45 Ca 0.55 )(Fe 0.5 Nb 0.5 ) 1Ày Zr y O 3 ceramics for y = 0.00, 0.06, and 0.15 with change in frequency from 10 kHz to 1 MHz at selected temperatures from 298 K to 573 K. The gradual decrease in relative permittivity with frequency for all compositions is attributed to the fact that the free dipoles are able to follow the field at low frequencies 20 but begin to lag behind the field at higher frequencies.…”

Section: Dielectric Propertiesmentioning

confidence: 93%

“…7 In order to reduce the losses and to make them suitable for these electronic devices, several attempts have been made to tailor the properties of these materials by the substitution at A-and/or B-sites. [10][11][12][13][14][15] In complex perovskites, B¢ and B¢¢ ion pairs show a variety of physical properties; 16 therefore, B-site substitution has been preferred in the present research work. There are two types of substitutions: charge balance and charge unbalance substitution.…”

Section: Introductionmentioning

confidence: 99%

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Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

Puri

Bahel

Narang

2016

Journal of Elec Materi

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The purpose of the present study is to improve the dielectric properties of lead calcium iron niobate with Zr substitution, and to make it suitable for multilayer capacitor applications in resonant circuits. (Pb 0.45 Ca 0.55 )(Fe 0.5 Nb 0.5 ) 1Ày Zr y O 3 dielectric ceramics where y varies from 0.00 to 0.15 in steps of 0.03, that have been synthesized by the columbite precursor method. Dielectric and electrical properties were measured as a function of frequency (10 kHz to 1 MHz) and temperature. Two frequency dependent anomalies were observed in relative permittivity (e r ) versus temperature (T) plots around 375 K and between 500 K and 575 K. The temperature coefficient of relative permittivity, (s e ) has been improved with the substitution of (Fe 0.5 Nb 0.5 ) 4+ ions by Zr 4+ ions at B-sites. The single semicircle, observed in Nyquist plots at different temperatures, suggests a single relaxation process in the synthesized samples. The activation energies obtained from different dependences are found to be approximately comparable.

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Section: Dielectric Propertiesmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

Puri

Bahel

Narang

2016

Journal of Elec Materi

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“…Nb 0.5 ) 4? ion (0.064 nm) [22]. Figure 3 shows the SEM micrographs of (Pb 0.45 Ca 0.55 )(Fe 0.5 Nb 0.5 ) 1-y Zr y O 3 ceramics for different Zr content.…”

Section: Percentage Of Perovskite Phasementioning

confidence: 99%

“…The dielectric and physical properties can be improved by using suitable substitutions. Many researchers have carried out the substitutions in A site or B site of lead iron niobates [16,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…PCFN and PCFN based solid solutions are the promising materials for microwave applications [33][34][35]. Several attempts have been made to design and develop these materials by substituting various isovalence and hetrovalence elements/atoms at both A-and/or B-site [21,22,[36][37][38]. The information about PCFN-based solid solutions is more restricted.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Zr substitution on structural, dielectric and magnetic behavior of lead calcium iron niobate

Puri

Bahel

Narang

2015

J Mater Sci: Mater Electron

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This work is an investigation of phase formation, crystal structure, microstructure, dielectric and magnetic properties of (Pb 0.45 Ca 0.55 )(Fe 0.5 Nb 0.5 ) 1-y Zr y O 3 where y varies from 0.00 to 0.15 in the steps of 0.03 synthesized by columbite precursor method. XRD results indicate the main phase of pseudo-cubic symmetry for all the solid solutions. Dielectric properties of the synthesized samples have been measured as a function of frequency from 200 kHz to 120 MHz at room temperature. Obtained results have shown that the introduction of Zr has improved the dielectric properties by decreasing the loss tangent values. Narrow magnetic hysteresis loops were observed at room temperature. When increasing Zr content at B-site, the saturation magnetization (M s ), remnant magnetization (M r ) and coercive field (H c ) increase up to y = 0.03 and then decreased.

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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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Microwave dielectric properties of (PbCa)(FeNbZr)O3 ceramics

Cited by 15 publications

References 8 publications

Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

Variation of Dielectric and Electrical Properties of Zr-Substituted Lead Calcium Iron Niobate with Temperature and Frequency

Influence of Zr substitution on structural, dielectric and magnetic behavior of lead calcium iron niobate

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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