A novel (1-x)MgZr0.85Sn0.15Nb2O8-xBa3Ti4Nb4O21 microwave dielectric composite ceramic with near-zero temperature coefficient

Zuo, Ruzhong

doi:10.1016/j.jallcom.2021.163101

Cited by 7 publications

(1 citation statement)

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“…Two traditional techniques for dielectric ceramic modification with desired features are known: one is to produce a new dielectric ceramic material, and the other is to make a composite utilizing two or more dielectric materials with characteristic compensation. The most common strategy is to combine two or more chemicals with negative and positiveτ f values to achieve nearly equal zero τ f values [6,[9][10][11][12]. For example, 0.95MgTiO3 -0.05CaTiO3 ceramic shows (ε r ) ∼21, (Q × f) ∼56,000 GHz at 7 GHz and τ f ∼ 0 ppm/°C [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of A-site modification on structural and microwave dielectric properties of calcium titanate

Rajput

Keshri

2022

J Met Mater Miner

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This article presents studies on characteristics properties of CaTiO3, Ca0.8Sr0.2TiO3, and Ca0.6La0.8/3TiO3 ceramics. These ceramics were synthesized using the solid-state reaction process. Structural examination revealed that the grown ceramics have an orthorhombic structure with the Pbnm space group. The random distribution of particle size was shown through morphological investigation. Apparent density of developed ceramics was determined using the Archimedes technique and found to be ˂ 90%. The microwave dielectric properties of grown ceramics are compared on the basis of ionic polarizability. It is observed that partial replacement of Ca-ions by Sr-ions provides a high permittivity value (er = 168.93), higher quality factor Q × f = 9,330 GHz), and enhanced positive temperature coefficient of resonant frequency (tf = 908.17). However, the substitution of Ca-ions by La-ions offers a low permittivity value (113.35), higher quality factor (16,730 GHz), and decreased temperature coefficient of resonant frequency (229.49 ppm/°C). These materials can be used with the ceramics possessing a negative temperature coefficient of resonant frequency to balance its tf- value nearly to zero.

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