Crystal structure and microwave dielectric properties of Ta5+ substituted MgZrNb2O8 ceramics

Xiao, Mi; Jian-shi, Lou; Zhou, Ziqi; Gu, Qingqing; Wei, Yanshuang; Zhang, Ping

doi:10.1016/j.ceramint.2017.08.109

Cited by 29 publications

(7 citation statements)

References 25 publications

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“…In an MgZrNb 2 O 8 system, the Ta 5+ cation is also proved to be an effective source to improve the lattice energy and Q × f value, and the average bond ionicity Af i value decreases similarly with the ε r value. 220 Complex (Sn 1/2 W 1/2 ) 5+ cation replacement for the Nb site in MgZrNb 2 O 8 system (0-0.06 mol) is also confirmed by the similar variation tendency. 221 From the above-mentioned reports, it can be concluded that the variation in bond ionicity may be proportional to the dielectric polarization, and an improvement in lattice energy actually enhances the structural stability and further improves the Q × f value.…”

Section: Monoclinic Wolframite Structuresupporting

confidence: 60%

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Yang

Zhang

2020

Inorg. Chem. Front.

111

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Section: Monoclinic Wolframite Structuresupporting

confidence: 60%

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Yang

Zhang

2020

Inorg. Chem. Front.

111

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“…Later, complex chemical bond theory involving bond ionicity ( f i ), bond covalency ( f c ), lattice energy ( U ), and thermal expansion coefficient (α L ) has been applied to discuss the influences of chemical bonds on crystal structure. , It also has been developed for explaining the relationships between bond characteristics and microwave dielectric properties. − Since the bond analysis provides structural variation of R-ZNT phase and O-ZTN phase, bond theory was applied to better verify the chemical bonds characteristics on the effects of dielectric properties.…”

Section: Resultsmentioning

confidence: 99%

Structural Evolution and Microwave Dielectric Properties ofxZn_0.5Ti_0.5NbO₄-(1–x)Zn_0.15Nb_0.3Ti_0.55O₂Ceramics

et al. 2018

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Structure and microwave properties of xZnTiNbO-(1 - x)ZnNbTiO ceramics in the range of x = 0.0-1.0 were investigated. Rietveld refinement analysis and Raman spectra show that rutile- and orthorhombic-type solid solutions formed at 0-0.2 and 0.65-1, a composite at 0.2-0.64. In the solid solution regions, chemical bonds are enlarged. In this case, the Zn/Ti/Nb-O1 bond covalency and bond susceptibility are reduced, and lattice energy and thermal expansion coefficient increase along with x increases, which is mainly responsible for the development of microwave dielectric properties. Furthermore, far-infrared spectra and a classical oscillator model were used to discuss the intrinsic dielectric properties in detail. Temperature stable ceramic was obtained for x = 0.516: ε ∼ 46.11, Q × f ∼ 27 031 GHz, and τ ∼ -1.51 ppm/°C, which is promising for microwave applications.

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“…Furthermore, Zhang et al generalized the bond theory that was proposed by Phillips, Van Vechten, and Levine (P–V–L) and gave detailed descriptions on how to separate the complex crystal A a B b C c D d into binary crystals A m B n . This developed chemical bond theory has been applied in electronic materials in the study of structure–property relationships. ,,, …”

Section: Resultsmentioning

confidence: 99%

“…23 This developed chemical bond theory has been applied in electronic materials in the study of structure− property relationships. 11,12,19,24 However, referring to the published literatures, there is no relevant literature about the bond characteristics of trirutile Co 0.5 Ti 0.5 TaO 4 ceramics. Therefore, exploring the relationships between the state of each bond and the properties is imperative.…”

Section: Resultsmentioning

confidence: 99%

Crystal Chemistry, Raman Spectra, and Bond Characteristics of Trirutile-Type Co_0.5Ti_0.5TaO₄ Microwave Dielectric Ceramics

Yang¹,

Zhang²,

Chen³

et al. 2018

Inorg. Chem.

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A novel trirutile-type Co0.5Ti0.5TaO4 ceramic was reported here for the first time. The correlations between the sintering behavior, crystal structure, chemical bond, and dielectric properties were investigated. Pure Co0.5Ti0.5TaO4 ceramic was synthesized in the temperature range of 1000–1100 °C. A trirutile structure and refined parameters of a = b = 4.71163 Å, c = 9.13586 Å, and V cell = 202.811 Å3 could be obtained (1075 °C). According to the P–V–L chemical bond theory, majority contributions to the dielectric constant originated from Ta–O bonds, owing to its largest bond ionicity and bond susceptibility values. The experimental dielectric constant is close to the theoretical values calculated via the P–V–L chemical bond theory and Clausius–Mossotti relationship. The Ta–O bonds that present the largest lattice energy are also the main factors influencing the intrinsic loss. The τf value is consistent with the oxygen distortions of the octahedron. More importantly, variations of the densification, average grain size, and grain boundary are crucial factors for development of the microwave dielectric properties. The Raman spectra and group theory were analyzed together, and the results indicated that the A1g mode at 687.45 cm–1, which reflects the stretching vibrations of the O anions, dominates the Raman vibrations. Typical microwave dielectric properties of Co0.5Ti0.5TaO4 ceramics were obtained when sintered at 1075 °C: εr = 40.69, Qf = 17291 GHz, and τf = 114.54 ppm/°C.

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Crystal structure and microwave dielectric properties of Ta5+ substituted MgZrNb2O8 ceramics

Cited by 29 publications

References 25 publications

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Structural Evolution and Microwave Dielectric Properties ofxZn_0.5Ti_0.5NbO₄-(1–x)Zn_0.15Nb_0.3Ti_0.55O₂Ceramics

Crystal Chemistry, Raman Spectra, and Bond Characteristics of Trirutile-Type Co_0.5Ti_0.5TaO₄ Microwave Dielectric Ceramics

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Crystal structure and microwave dielectric properties of Ta5+ substituted MgZrNb2O8 ceramics

Cited by 29 publications

References 25 publications

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

Structural Evolution and Microwave Dielectric Properties ofxZn0.5Ti0.5NbO4-(1–x)Zn0.15Nb0.3Ti0.55O2Ceramics

Crystal Chemistry, Raman Spectra, and Bond Characteristics of Trirutile-Type Co0.5Ti0.5TaO4 Microwave Dielectric Ceramics

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Product

Resources

About

Structural Evolution and Microwave Dielectric Properties ofxZn_0.5Ti_0.5NbO₄-(1–x)Zn_0.15Nb_0.3Ti_0.55O₂Ceramics

Crystal Chemistry, Raman Spectra, and Bond Characteristics of Trirutile-Type Co_0.5Ti_0.5TaO₄ Microwave Dielectric Ceramics