Enhanced Q×f in CoTi(Nb1-xVx)2O8 ceramics by tuning oxygen vacancy concentration and Co valence state

IF 3.2 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Solid State Chemistry Pub Date : 2025-01-06 DOI:10.1016/j.jssc.2025.125182

Shengming Liu, Yun Zhang, Shihua Ding, Tianxiu Song

{"title":"Enhanced Q×f in CoTi(Nb1-xVx)2O8 ceramics by tuning oxygen vacancy concentration and Co valence state","authors":"Shengming Liu, Yun Zhang, Shihua Ding, Tianxiu Song","doi":"10.1016/j.jssc.2025.125182","DOIUrl":null,"url":null,"abstract":"<div><div>V cation was introduced at Nb-site in CoTiNb2O8 for the purpose of tuning the defects concentration. XRD analysis indicated that no secondary phase developed over the whole composition range. The sintering temperature decreased to 1150 °C in current work, compared with pure CoTiNb2O8 ceramic (∼1250 °C). V-introduction inhibited grain growth and benefited grain homogenization. The decreased molecular dielectric polarizability and blue shift of Raman A1g mode both made lower εr from 59.2 to 41.8. Based on the X-ray photoelectron spectroscopy (XPS), V doping decreased the oxygen vacancy concentration and tuned the Co valence state. The defects compensation by oxygen and Co vacancies significantly improved Q × f up to 38,012 GHz, accompanied with a 50 % rise. The slight increase in τf was attributed to the Nb–O bond energy reduction. The CoTi(Nb0.97V0.03)2O8 had a high εr of 54.6 with good Q × f of about 38,012 GHz and τf = 96.47 ppm/°C. Enhanced Q × f and low sintering temperature were achieved simultaneously.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"344 ","pages":"Article 125182"},"PeriodicalIF":3.2000,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Solid State Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0022459625000052","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}

引用次数: 0

Abstract

V cation was introduced at Nb-site in CoTiNb₂O₈ for the purpose of tuning the defects concentration. XRD analysis indicated that no secondary phase developed over the whole composition range. The sintering temperature decreased to 1150 °C in current work, compared with pure CoTiNb₂O₈ ceramic (∼1250 °C). V-introduction inhibited grain growth and benefited grain homogenization. The decreased molecular dielectric polarizability and blue shift of Raman A_1g mode both made lower ε_r from 59.2 to 41.8. Based on the X-ray photoelectron spectroscopy (XPS), V doping decreased the oxygen vacancy concentration and tuned the Co valence state. The defects compensation by oxygen and Co vacancies significantly improved Q × f up to 38,012 GHz, accompanied with a 50 % rise. The slight increase in τ_f was attributed to the Nb–O bond energy reduction. The CoTi(Nb_0.97V_0.03)₂O₈ had a high ε_r of 54.6 with good Q × f of about 38,012 GHz and τ_f = 96.47 ppm/°C. Enhanced Q × f and low sintering temperature were achieved simultaneously.

Abstract Image

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Solid State Chemistry 化学-无机化学与核化学

CiteScore

6.00

自引率

9.10%

发文量

848

审稿时长

25 days

期刊介绍： Covering major developments in the field of solid state chemistry and related areas such as ceramics and amorphous materials, the Journal of Solid State Chemistry features studies of chemical, structural, thermodynamic, electronic, magnetic, and optical properties and processes in solids.