{"title":"A novel microwave dielectric ceramic CaB2O4 with low dielectric constant","authors":"","doi":"10.1016/j.physb.2024.416526","DOIUrl":null,"url":null,"abstract":"<div><p>A novel microwave dielectric ceramic CaB<sub>2</sub>O<sub>4</sub> with low dielectric constant was synthesized by the solid-state reaction method. The impact of diverse Ca/B ratios on the phase composition, microstructure and dielectric properties of CaB<sub>2+x</sub>O<sub>4+3x/2</sub> (x = 0–0.6) ceramics was investigated. The bond ionicity and the lattice energy of CaB<sub>2+x</sub>O<sub>4+3x/2</sub> ceramics were calculated by the P-V-L theory. The appropriate excess of boron facilitated the densification of CaB<sub>2</sub>O<sub>4</sub> ceramics, resulting in the stable crystal structure and enhanced dielectric properties. CaB<sub>2.3</sub>O<sub>4.45</sub> ceramic sintered at 950 °C had excellent properties: <em>ε</em><sub><em>r</em></sub> = 6.03, <em>Q×f</em> = 37,962 GHz, and <em>τ</em><sub><em>f</em></sub> = −24.7 ppm/°C. The influence of TiO<sub>2</sub> on the microwave dielectric properties of CaB<sub>2</sub>O<sub>4</sub> was investigated, 87 wt% CaB<sub>2</sub>O<sub>4</sub> - 13 wt% TiO<sub>2</sub> ceramics sintered at 950 °C showed a zero <em>τ</em><sub><em>f</em></sub> value.</p></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B-condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921452624008676","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
A novel microwave dielectric ceramic CaB2O4 with low dielectric constant was synthesized by the solid-state reaction method. The impact of diverse Ca/B ratios on the phase composition, microstructure and dielectric properties of CaB2+xO4+3x/2 (x = 0–0.6) ceramics was investigated. The bond ionicity and the lattice energy of CaB2+xO4+3x/2 ceramics were calculated by the P-V-L theory. The appropriate excess of boron facilitated the densification of CaB2O4 ceramics, resulting in the stable crystal structure and enhanced dielectric properties. CaB2.3O4.45 ceramic sintered at 950 °C had excellent properties: εr = 6.03, Q×f = 37,962 GHz, and τf = −24.7 ppm/°C. The influence of TiO2 on the microwave dielectric properties of CaB2O4 was investigated, 87 wt% CaB2O4 - 13 wt% TiO2 ceramics sintered at 950 °C showed a zero τf value.
期刊介绍:
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces