DyVO4: A novel microwave dielectric ceramic with low dielectric constant

Chen, Li; Chen, Zhuting; Li, Bo

doi:10.1016/j.physb.2022.414462

Cited by 7 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…), materials with a low dielectric constant (ε r ) have garnered significant attention and research efforts in recent years. 4,5 In addition, attaining superior frequency selective characteristics and temperature stability requires a large quality factor (Q×f) and a near-zero temperature coefficient of resonance frequency (τ f ). [6][7][8][9] Orthophosphate ceramics with stable crystalline structures are widely applied in the field of functional ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…The rapid progression of millimeter‐wave communication and radar systems has promoted the development of advanced microwave dielectric ceramic components, such as dielectric resonators, filters, antennas, substrates, etc., capable of delivering exceptional performance at elevated operating frequencies 1–3 . Since low polarization at high frequencies benefits reduced noise and inductive crosstalk and decreased signal transmission delay in dielectrics (

{T_{{\mathrm{PD}}}}{\mathrm{ = }}\frac{{\sqrt {{\varepsilon _{\mathrm{r}}}} }}{c}\

), materials with a low dielectric constant ( ε r ) have garnered significant attention and research efforts in recent years 4,5 . In addition, attaining superior frequency selective characteristics and temperature stability requires a large quality factor ( Q × f ) and a near‐zero temperature coefficient of resonance frequency ( τ f ) 6–9 …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploring the Ln–O bonding nature and charge characteristics in monazite in relation to microwave dielectric properties

Li,

Liu,

Zhang

et al. 2023

J Am Ceram Soc.

View full text Add to dashboard Cite

The microstructure design is important for regulating the microwave dielectric properties of materials. However, in‐depth studies on the frequency temperature stability and related micro‐mechanism remain poorly understood. The work investigates the correlation among the sintering behavior, crystal structure, bonding nature and microwave dielectric properties of LnPO4 (Ln = Eu, Pr) ceramics by combining first‐principles calculations and experimental perspective. The high density (ρ > 97%) and large grains associated with lattice expansion benefit the optimum dielectric properties: εr = 11.24, Q×f = 61,138 GHz @ 13.311 GHz and τf = ‐30.3 ppm/°C for EuPO4 sintered at 1500°C (εr = 11.35, Q×f = 63,496 GHz @ 13.042 GHz and τf = ‐39.5 ppm/°C for PrPO4 sintered at 1525°C). Bond valence analysis shows a rattling effect in [EuO9] due to a smaller ionic radius. The effect induces an abnormally large polarization, effectively shifting the negative τf towards near‐zero values. The electron localization functions, charge transfer and bonding nature are discussed by DFT calculations, which illustrate stronger charge transfer and ionicity between Eu and O. This observation effectively predicts and validates the non‐harmonic lattice vibrations and abnormally large polarization obtained from Raman spectrums and Rietveld refinement. These findings systematically clarify the optimized effect and micro‐mechanism of lanthanides on the dielectric properties of monazite ceramics.This article is protected by copyright. All rights reserved

show abstract