Raman, complex chemical bond and structural studies of novel CaMg1-x(Mn1/2Zn1/2)(x)Si2O6 (x=0-0.1) ceramics
Raman, complex chemical bond and structural studies of novel CaMg1-x(Mn1/2Zn1/2)(x)Si2O6 (x=0-0.1) ceramics
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新型CaMg1-x(Mn1/2Zn1/2)xSi2O6 (x=0-0.1)陶瓷的拉曼、复杂化学键和结构研究
DOI：
10.1016/j.ceramint.2019.08.010
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发表时间：
2019
影响因子：
5.2
通讯作者：
Zhang Shuren
中科院分区：
文献类型：
--
作者：
Li Hao;Cai Chaoyang;Xiang Qiuyuan;Tang Bin;Yu Shengquan;Xiao Jing;Luo Heng;Zhang Shuren
采用固相反应法首次合成了低介电常数CaMg 1-x（Mn 1/2 Zn 1/2）xSi 2 O 6（x= 0-0.1）陶瓷。采用Rietveld精修、复杂化学键理论和拉曼光谱分析了Mn 2+/Zn 2+共取代对微波介电性能的影响。XRD分析表明，当x≤ 0.0 2时，CaMg 1-x（Mn 1/2 Zn 1/2）xSi 2 O 6陶瓷中形成纯相CaMgSi 2 O 6，当x≤ 0.0 4 ≤ x≤ 0.1时，陶瓷中形成少量第二相Ca 2 MgSi 2 O 7.ε r的变化可以归结为平均键象似性和拉曼位移。总晶格能和堆积分数是影响Q× f值的主要因素。τ f的单调减小与总键价和拉曼峰半高宽有关。在1280° C烧结3 h的CaMg 1-x（Mn 1/2 Zn 1/2）xSi 2 O 6（x= 0.02）陶瓷具有优异的微波介电性能，ε r= 8.16，Q× f= 70187，τ f=− 38.48ppm/° C。
Abstract Low permittivity CaMg 1-x (Mn 1/2 Zn 1/2) x Si 2 O 6 (x= 0-0.1) ceramics were synthesized via the solid-state reaction process for the first time. The Rietveld refinement, complex chemical bond theory and Raman spectra were introduced to analyze the effects of Mn 2+/Zn 2+ co-substitution to microwave dielectric properties. XRD spectra indicate the CaMg 1-x (Mn 1/2 Zn 1/2) x Si 2 O 6 ceramics processed the pure phase of CaMgSi 2 O 6 when x≤ 0.02 and a small volume of secondary phase Ca 2 MgSi 2 O 7 for 0.04≤ x≤ 0.1. The variation of ε r can be put down to average bond iconicity and Raman shift. Total lattice energy and packing fraction are main influence factor of the Q× f value. The monotonous decrease of τ f is associated with total bond valence and full width at half maximum of Raman peak. Additionally, CaMg 1-x (Mn 1/2 Zn 1/2) x Si 2 O 6 (x= 0.02) ceramics sintered at 1280° C for 3 h exhibited excellent microwave dielectric properties of ε r= 8.16, Q× f= 70187, τ f=− 38.48 ppm/° C.