Crystal Structure and Dielectric Properties of Ceramics

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Polycrystalline Ceramics".

Deadline for manuscript submissions: 25 April 2025 | Viewed by 1962

Special Issue Editors


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Guest Editor
School of Electronic and Information Engineering, Anhui University, Hefei 230601, China
Interests: microwave dielectric ceramics; low temperature co-fired ceramic; integrated devices; crystal structure

E-Mail Website
Guest Editor
University of Electronic Science and Technology of China, Chengdu 611173, China
Interests: dielectric properties; crystal structure; ferrites

Special Issue Information

Dear Colleagues,

The booming development of communication technology has greatly accelerated research on ceramics, especially considering their superiorities when applied for filters, waveguides, duplexers, and resonators. The current issue will focus on the mechanisms, synthesis, and crystal structure of ceramics and discuss their effects on dielectric properties and applications. Research areas may include (but are not limited to) the following: (1) the exploration of novel ceramic systems; (2) the low-temperature synthesis and preparation of ceramics; (3) the correlation between crystal structure and performance; (4) potential applications;

This Special Issue on “Crystal Structure and Dielectric Properties of Ceramics” will provide a valuable and timely collection of recent advances in the synthesis, fundamentals, characterization, and applications of ceramics. We are pleased to invite you to contribute your findings and insights on the ceramics.

Dr. Gang Wang
Dr. Jie Li
Guest Editors

Manuscript Submission Information

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Keywords

  • ceramics
  • dielectric properties
  • crystal structure
  • synthesis and preparation of ceramics
  • theoretical Investigations
  • simulations and modeling
  • applications of ceramics

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Published Papers (2 papers)

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Research

12 pages, 6711 KiB  
Article
Crystal Structure and Microwave Dielectric Characteristics of Novel Ba(Eu1/5Sm1/5Nd1/5Pr1/5La1/5)2Ti4O12 High-Entropy Ceramic
by Qing Wan, Zeping Li, Huifeng Wang, Gang Xiong and Geng Wang
Crystals 2024, 14(9), 754; https://doi.org/10.3390/cryst14090754 - 25 Aug 2024
Viewed by 767
Abstract
High-permittivity Ba(Eu1/5Sm1/5Nd1/5Pr1/5La1/5)2Ti4O12 (BESNPLT) high-entropy ceramics (HECs) were synthesized via a solid-state route. The microstructure, sintering behavior, phase structure, vibration modes, and microwave dielectric characteristics of the BESNPLT HECs [...] Read more.
High-permittivity Ba(Eu1/5Sm1/5Nd1/5Pr1/5La1/5)2Ti4O12 (BESNPLT) high-entropy ceramics (HECs) were synthesized via a solid-state route. The microstructure, sintering behavior, phase structure, vibration modes, and microwave dielectric characteristics of the BESNPLT HECs were thoroughly investigated. The phase structure of the BESNPLT HECs was confirmed to be a single-phase orthorhombic tungsten-bronze-type structure of Pnma space group. Permittivity (εr) was primarily influenced by polarizability and relative density. The quality factor (Q×f) exhibited a significant correlation with packing fraction, whereas the temperature coefficient (TCF) of the BESNPLT HECs closely depended on the tolerance factor and bond valence of B-site. The BESNPLT HECs sintered at 1400 °C, demonstrating high relative density (>97%) and optimum microwave dielectric characteristics with TCF = +38.9 ppm/°C, Q×f = 8069 GHz (@6.1 GHz), and εr = 87.26. This study indicates that high-entropy strategy was an efficient route in modifying the dielectric characteristics of tungsten-bronze-type microwave ceramics. Full article
(This article belongs to the Special Issue Crystal Structure and Dielectric Properties of Ceramics)
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11 pages, 5720 KiB  
Article
Investigation of the Positive Temperature Coefficient Resistivity of Nb-Doped Ba0.55Sr0.45TiO3 Ceramics
by Yifei Wang and Xiaoyang Chen
Crystals 2024, 14(5), 419; https://doi.org/10.3390/cryst14050419 - 29 Apr 2024
Cited by 1 | Viewed by 877
Abstract
The demands of low-Curie-temperature (~−10 °C) positive temperature coefficient (PTC) thermistors are increasing in advanced precision integrated circuits and other industries. In this paper, the Nb-doped Ba0.55Sr0.45TiO3(BST)-based PTC resistivity materials are reported. The effects of the sintering [...] Read more.
The demands of low-Curie-temperature (~−10 °C) positive temperature coefficient (PTC) thermistors are increasing in advanced precision integrated circuits and other industries. In this paper, the Nb-doped Ba0.55Sr0.45TiO3(BST)-based PTC resistivity materials are reported. The effects of the sintering process, especially the cooling rate on the PTC properties of the material, are investigated. The results indicate that the Ba0.55Sr0.45Ti0.9985Nb0.0015O3 composition of the prepared PTC ceramics demonstrates promising PTC characteristics. These include a Curie temperature as low as −13 °C, a high temperature coefficient of 0.296 at −3.4 °C, a large enough resistivity change of 3.1 over a narrow phase transition temperature range of approximately 38 °C, and moderate resistivity below the Curie temperature. Such properties suggest that the Ba0.55Sr0.45Ti0.9985Nb0.0015O3 ceramics are likely suitable for use in thermal management systems designed for low-temperature control. Full article
(This article belongs to the Special Issue Crystal Structure and Dielectric Properties of Ceramics)
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