无机材料学报2025，Vol.40Issue(6)：647-655,9.DOI:10.15541/jim20240512
(Ti0.5W0.5)5+掺杂MgNb2O6陶瓷的晶体结构与太赫兹介电性能
Crystal Structure and Terahertz Dielectric Properties of(Ti0.5W0.5)5+Doped MgNb2O6 Ceramics
摘要
Abstract
MgNb2O6 ceramics offer advantages such as moderate sintering temperature and low dielectric loss,making them widely applicable in the field of wireless communications.However,the correlation mechanism between MgNb2O6 structure and terahertz dielectric properties remains inadequately understood.To address this gap,MgNb2-x(Ti0.5W0.5)xO6(x=0-0.03)ceramics were prepared by solid state reaction method in this study.The crystal structure of MgNb2-x(Ti0.5W0.5)xO6(x=0-0.03)ceramics and its correlation with terahertz dielectric properties were studied using Rietveld refinement,complex chemical bond theory,and terahertz time domain spectroscopy.The global instability index was introduced to characterize the in-lattice strain in single-phase MgNb2O6 system,establishing a correlation among in-lattice strain,lattice energy and terahertz dielectric loss.The results show that(Ti0.5W0.5)5+ions can modify the crystal structure.With the increase in doping amount,the internal strain reduces,and the stability of crystal structure and lattice energy increases,leading to decrease in dielectric loss.In addition,the atomic packing density increases with higher(Ti0.5W0.5)5+ion doping,which effectively inhibits the anharmonic vibration of the crystal and further reduces the dielectric loss.At a sintering temperature of 1340℃,MgNb2-x(Ti0.5W0.5)xO6(x=0.03)ceramics have excellent terahertz dielectric properties,with a dielectric constant(εr)of 19.32,a dielectric loss of 0.003(@0.30 THz),and an absorption coefficient of 1.64 cm-1(@0.30 THz).The MgNb2-x(Ti0.5W0.5)xO6(x=0.03)ceramics prepared in this study have a good application prospect in terahertz devices.关键词
MgNb2O6陶瓷/晶体结构/复杂化学键理论/内应变/太赫兹介电性能Key words
MgNb2O6 ceramic/crystal structure/complex chemical bond theory/internal strain/terahertz dielectric property分类
数理科学引用本文复制引用
黄子鹏,贾文晓,李玲霞..(Ti0.5W0.5)5+掺杂MgNb2O6陶瓷的晶体结构与太赫兹介电性能[J].无机材料学报,2025,40(6):647-655,9.基金项目
国家自然科学基金(52172122) （52172122）
国家重点研发计划(2023YFB3812200) （2023YFB3812200）
天津市自然科学基金(22JCQNJC00260)National Natural Science Foundation of China(52172122) （22JCQNJC00260）
National Key R&D Program of China(2023YFB3812200) （2023YFB3812200）
Natural Science Foundation of Tianjin(22JCQNJC00260) （22JCQNJC00260）
