Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects

Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects

Microwave dielectric (1 − x)CoTiTa<sub>2</sub>O<sub>8</sub>-xMgNb<sub>2</sub>O<sub>6</sub> composite ceramics (x = 0.625–0.725) were fabricated through a two-step method and sintering techniques. The applied CoTiTa<sub>2</sub>O<sub>8&...

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Main Authors: Jun Zuo, Haodong Wang, Xiuli Fu, Zhijian Peng
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Metals
Subjects:
composite ceramics
CoTiTa<sub>2</sub>O<sub>8</sub>
MgNb<sub>2</sub>O<sub>6</sub>
sintering
microwave dielectric properties
Online Access:https://www.mdpi.com/2075-4701/15/4/407
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author Jun Zuo
Haodong Wang
Xiuli Fu
Zhijian Peng
author_facet Jun Zuo
Haodong Wang
Xiuli Fu
Zhijian Peng
author_sort Jun Zuo
collection DOAJ
description Microwave dielectric (1 − x)CoTiTa<sub>2</sub>O<sub>8</sub>-xMgNb<sub>2</sub>O<sub>6</sub> composite ceramics (x = 0.625–0.725) were fabricated through a two-step method and sintering techniques. The applied CoTiTa<sub>2</sub>O<sub>8</sub> and MgNb<sub>2</sub>O<sub>6</sub> powders were both synthesized by calcining stoichiometric mixtures of their respective metal oxides at 1000 °C for 3 h. The optimal sintering parameters were determined using visual high-temperature deformation analysis. The influence of the MgNb<sub>2</sub>O<sub>6</sub> content on the phase composition, microstructure, and microwave dielectric properties of the obtained composite ceramics was comprehensively investigated. It was observed that an increase in the MgNb<sub>2</sub>O<sub>6</sub> content resulted in a reduction in the dielectric constant (ε<sub>r</sub>) and a significant enhancement in the quality factor (Q × <i>f</i>). The ceramics with a compositional value of x = 0.675, sintered at 1193 °C for 4.5 h, demonstrated a near-zero temperature coefficient of the resonant frequency (τ<i><sub>f</sub></i>), exhibiting optimal microwave dielectric properties: ε<sub>r</sub> = 28.4, Q × <i>f</i> = 33,055 GHz, and τ<i><sub>f</sub></i> = −3.1 ppm/°C. These findings underscore the potential of the present CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> composite ceramics for advanced microwave applications.
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institution OA Journals
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publishDate 2025-04-01
publisher MDPI AG
record_format Article
series Metals
spelling doaj-art-32d8b4d2a2014f5eb54449997c5d1da32025-08-20T02:28:15ZengMDPI AGMetals2075-47012025-04-0115440710.3390/met15040407Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional EffectsJun Zuo0Haodong Wang1Xiuli Fu2Zhijian Peng3School of Science, China University of Geosciences, Beijing 100083, ChinaSchool of Engineering and Technology, China University of Geosciences, Beijing 100083, ChinaSchool of Science, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaSchool of Science, China University of Geosciences, Beijing 100083, ChinaMicrowave dielectric (1 − x)CoTiTa<sub>2</sub>O<sub>8</sub>-xMgNb<sub>2</sub>O<sub>6</sub> composite ceramics (x = 0.625–0.725) were fabricated through a two-step method and sintering techniques. The applied CoTiTa<sub>2</sub>O<sub>8</sub> and MgNb<sub>2</sub>O<sub>6</sub> powders were both synthesized by calcining stoichiometric mixtures of their respective metal oxides at 1000 °C for 3 h. The optimal sintering parameters were determined using visual high-temperature deformation analysis. The influence of the MgNb<sub>2</sub>O<sub>6</sub> content on the phase composition, microstructure, and microwave dielectric properties of the obtained composite ceramics was comprehensively investigated. It was observed that an increase in the MgNb<sub>2</sub>O<sub>6</sub> content resulted in a reduction in the dielectric constant (ε<sub>r</sub>) and a significant enhancement in the quality factor (Q × <i>f</i>). The ceramics with a compositional value of x = 0.675, sintered at 1193 °C for 4.5 h, demonstrated a near-zero temperature coefficient of the resonant frequency (τ<i><sub>f</sub></i>), exhibiting optimal microwave dielectric properties: ε<sub>r</sub> = 28.4, Q × <i>f</i> = 33,055 GHz, and τ<i><sub>f</sub></i> = −3.1 ppm/°C. These findings underscore the potential of the present CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> composite ceramics for advanced microwave applications.https://www.mdpi.com/2075-4701/15/4/407composite ceramicsCoTiTa<sub>2</sub>O<sub>8</sub>MgNb<sub>2</sub>O<sub>6</sub>sinteringmicrowave dielectric properties
spellingShingle Jun Zuo
Haodong Wang
Xiuli Fu
Zhijian Peng
Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects
Metals
composite ceramics
CoTiTa<sub>2</sub>O<sub>8</sub>
MgNb<sub>2</sub>O<sub>6</sub>
sintering
microwave dielectric properties
title Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects
title_full Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects
title_fullStr Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects
title_full_unstemmed Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects
title_short Microwave Dielectric Behavior of CoTiTa<sub>2</sub>O<sub>8</sub>-MgNb<sub>2</sub>O<sub>6</sub> Composite Ceramics: A Focus on Temperature Stability and Compositional Effects
title_sort microwave dielectric behavior of cotita sub 2 sub o sub 8 sub mgnb sub 2 sub o sub 6 sub composite ceramics a focus on temperature stability and compositional effects
topic composite ceramics
CoTiTa<sub>2</sub>O<sub>8</sub>
MgNb<sub>2</sub>O<sub>6</sub>
sintering
microwave dielectric properties
url https://www.mdpi.com/2075-4701/15/4/407
work_keys_str_mv AT junzuo microwavedielectricbehaviorofcotitasub2subosub8submgnbsub2subosub6subcompositeceramicsafocusontemperaturestabilityandcompositionaleffects
AT haodongwang microwavedielectricbehaviorofcotitasub2subosub8submgnbsub2subosub6subcompositeceramicsafocusontemperaturestabilityandcompositionaleffects
AT xiulifu microwavedielectricbehaviorofcotitasub2subosub8submgnbsub2subosub6subcompositeceramicsafocusontemperaturestabilityandcompositionaleffects
AT zhijianpeng microwavedielectricbehaviorofcotitasub2subosub8submgnbsub2subosub6subcompositeceramicsafocusontemperaturestabilityandcompositionaleffects

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