A new microwave dielectric ceramic TmVO4 with high-quality factor and the effect of TiO2 on its microwave dielectric properties

Chen, Zhuting; Zheng, Yuxin; Li, Bo

doi:10.1007/s10854-023-10254-8

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…With the rapid development of network and information technology, the fifth generation (5G) network, online classroom and other technologies that are inseparable from people’s lives are increasingly demanding the performance of capacitors, the basic components of electronic products 1 – 3 . Therefore, the research on the dielectric properties of different dielectric materials has always been a hot issue 4 – 7 . As a traditional dielectric material, CaCu 3 Ti 4 O 12 (CCTO) has been closely watched since its giant dielectric properties were found 8 – 11 .…”

Section: Introductionmentioning

confidence: 99%

Effects of multiple cations and sintering temperature on microstructure and dielectric properties in Na1/2Ln1/2Cu3Ti4O12 (Ln = Sm and Eu) ceramic materials

Yuan,

Zhang,

Han

2023

Sci Rep

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Na1/2Eu1/2Cu3Ti4O12 and Na1/2Sm1/2Cu3Ti4O12 dielectric ceramics were synthesized at different sintering temperatures (950, 975 and 1000 °C) by a solid-state reaction method. Phase structure, cation valence state, and dielectric properties of all sintered ceramics were systematically investigated. When the preparation temperature was changed, the Cu+ ion concentration of (Na+, Eu3+) co-doped ceramics changed faster than that of (Na+, Sm3+) co-doped ceramics. Abnormally high dielectric constants of ~ 3.17 × 104 and ~ 1.06 × 104 (at 10 Hz and 303 K) were achieved in Na1/2Sm1/2Cu3Ti4O12 and Na1/2Eu1/2Cu3Ti4O12 ceramics prepared at 950 °C, respectively. However, Na1/2Sm1/2Cu3Ti4O12 and Na1/2Eu1/2Cu3Ti4O12 prepared in high sintering temperature (1000 °C) exhibited a good frequency stability of dielectric permittivity. It was demonstrated that an increasing number of charge carriers induced by the increase of sintering temperature could lead to a competitive coexistence of two polarization mechanisms (surface barrier layer capacitor and internal barrier layer capacitor), further changing the dielectric properties of CaCu3Ti4O12-based ceramics.

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Section: Introductionmentioning

confidence: 99%

Effects of multiple cations and sintering temperature on microstructure and dielectric properties in Na1/2Ln1/2Cu3Ti4O12 (Ln = Sm and Eu) ceramic materials

Yuan,

Zhang,

Han

2023

Sci Rep

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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.

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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

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Effects of multiple cations and sintering temperature on microstructure and dielectric properties in Na1/2Ln1/2Cu3Ti4O12 (Ln = Sm and Eu) ceramic materials

Yuan

Zhang

Han

2023

Preprint

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Na1/2Eu1/2Cu3Ti4O12 and Na1/2Sm1/2Cu3Ti4O12 dielectric ceramics were synthesized at different sintering temperatures (950, 975 and 1000 oC) by a solid-state reaction method. Phase structure, cation valence state, and dielectric properties of all sintered ceramics were systematically investigated. When the preparation temperature was changed, the Cu+ ion concentration of (Na+, Eu3+) co-doped ceramics changed faster than that of (Na+, Sm3+) co-doped ceramics. Abnormally high dielectric permittivity ~3.17 Í 104 were accomplished of Na1/2Sm1/2Cu3Ti4O12 ceramic at a sintering temperature 950 oC. However, Na1/2Eu1/2Cu3Ti4O12 and Na1/2Sm1/2Cu3Ti4O12 prepared in high sintering temperature (1000 oC) exhibited a good dielectric stability and low loss tangent (0.061 and 0.102 at 10 Hz, respectively). It was demonstrated that an increasing number of charge carriers induced by the increase of sintering temperature could lead to a competitive coexistence of two polarization mechanisms (surface barrier layer capacitor and internal barrier layer capacitor), further changing the dielectric properties of CaCu3Ti4O12-based ceramics.

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A new microwave dielectric ceramic TmVO4 with high-quality factor and the effect of TiO2 on its microwave dielectric properties

Cited by 3 publications

References 19 publications

Effects of multiple cations and sintering temperature on microstructure and dielectric properties in Na1/2Ln1/2Cu3Ti4O12 (Ln = Sm and Eu) ceramic materials

Effects of multiple cations and sintering temperature on microstructure and dielectric properties in Na1/2Ln1/2Cu3Ti4O12 (Ln = Sm and Eu) ceramic materials

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

Effects of multiple cations and sintering temperature on microstructure and dielectric properties in Na1/2Ln1/2Cu3Ti4O12 (Ln = Sm and Eu) ceramic materials

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