Li3Mg2SbO6 Ceramic Sintering via ZnO Doping
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Solution Overview
Problem
Current microwave dielectric materials face challenges in sintering difficulties, high dielectric loss, and temperature instability, which hinder their performance in high-frequency applications, especially in 5G communication technology.
Innovation Solution
A Li3Mg2SbO6-based microwave dielectric ceramic material with a modified chemical formula Li3(Mg1-xZnx)SbO6 (0.02≤x≤0.08) is developed using a two-step solid-phase reaction method, involving pre-sintering of Li3SbO4 and subsequent sintering of the mixed MgO, ZnO, and Li3SbO4 powders to achieve easy sintering, high Q value, and low dielectric constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If pure-phase Li3Mg2SbO6 microwave dielectric ceramic is used, then high quality factor is achieved, but sintering difficulty increases
Solution Approach 1:
The invention modifies the chemical composition parameters by introducing ZnO as a dopant into the Li3Mg2SbO6 system, creating Li3(Mg1-xZnx)2SbO6 with x=0.02-0.08. This compositional parameter change enables easier sintering while maintaining high quality factor, as the ZnO addition modifies the sintering behavior and phase formation characteristics of the base material.
Solution Approach 2:
The invention creates a composite ceramic system by combining Li3SbO4, MgO, and ZnO components in specific ratios. The composite nature of this material system allows the ZnO to act as a sintering aid that promotes densification and phase formation at more accessible temperatures, thereby reducing sintering difficulty while preserving the high Q factor properties of the Li3Mg2SbO6 base material.
2Reliability
If conventional microwave dielectric materials are used, then existing performance requirements are met, but dielectric loss increases at high frequencies
Solution Approach 1:
The invention optimizes the chemical composition parameters of the ceramic system by controlling the ZnO content within specific ranges (x=0.02-0.08 in Li3(Mg1-xZnx)2SbO6). This precise parameter control achieves optimal balance between dielectric constant, quality factor, and loss tangent, thereby reducing dielectric loss at high frequencies while maintaining reliable signal transmission.
3Speed
If microwave dielectric materials are used in 5G communication, then high frequency performance is required, but temperature stability deteriorates
Solution Approach 1:
The invention adjusts the compositional parameters of the Li3(Mg1-xZnx)2SbO6 system to achieve near-zero temperature coefficient of resonant frequency (TCF). The specific ZnO content range (x=0.02-0.08) is optimized to compensate for temperature-induced frequency drift, thereby maintaining frequency stability across temperature variations while supporting high-frequency 5G communication applications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting ceramic material exhibits excellent temperature stability, high quality factor, and low dielectric constant, making it suitable for high-frequency applications in 5G communication, radar, and satellite communication, with improved signal transmission and frequency stability.
Implementation Method 1
The preparation method adopts a solid-phase reaction method to conduct two-step sintering
Implementation Method 2
The preparation method adopts a solid-phase reaction method to conduct two-step sintering: (1) mixing and ball-milling Sb2O3 and Li2CO3 according to a chemical ratio of Li3SbO4 and then drying, and conducting pre-sintering to obtain a Li3SbO4 microwave dielectric phase
Data Source
AI summary
A Li3Mg2SbO6-based microwave dielectric ceramic material easy to sinter and with high Q value, and a preparation method thereof are disclosed. A chemical formula of the material is Li3(Mg1-xZnx)2SbO6, wherein 0.02≤x≤0.08. The preparation method includes: 1) mixing and ball-milling Sb2O3 and Li2CO3 according to a chemical ratio and then drying, and conducting pre-sintering to obtain a Li3SbO4 phase; and 2) mixing and ball-milling MgO, ZnO and Li3SbO4 powder according a chemical ratio of Li3(Mg1-xZnx)2SbO6 and then drying, conducting granulation and sieving after adding an adhesive, pressing into a cylindrical body, and sintering the cylindrical body into ceramic in the air at 1325° C. and under normal pressure, wherein a dielectric constant is 7.2-8.5, a quality factor is 51844-97719 GHz, and a temperature coefficient of resonance frequency is −14-1 ppm/° C.