多元元素鈣鈦礦之微波介電特性探討

Microwave Dielectric Properties of Perovskites with Multi-Elements

劉重佑(Chung-Yu Liu)

指導教授 ： 王錫福

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2010年)

摘要

ABO3複合型鈣鈦礦材料上，Ba(Zn1/3Ta2/3)O3屬於B-site陽離子1: 2有序排列之複雜鈣鈦礦結構，擁有良好的介電常數、高品質因子與低共振頻率溫度係數，因此常被應用於微波材料上。過去的研究中，主要研究在於探討B-site有序結構的變化對其微波介電性質的影響。本研究提出依序增加Nb5+、Sb5+、Co2+、Sr2+，以等莫耳添加的方式，嘗試置換部分A-site、B-site陽離子以達多元化之目的，並分別探討多元化成分的添加對於緻密化行為、晶體結構與微波特性所造成的影響。
Ba(Zn1/6Co1/6Ta2/9Nb2/9Sb2/9)O3於1575℃/6 h可燒結緻密，密度6.57g/cm3，微波性質εr =25、Q×f =68,000GHz、τf = -13 ppm/℃；相較於B-site二元鈣鈦礦Ba(Zn1/3Ta2/3)O3，不僅降低燒結溫度，微波應用上更能有效減少電磁能的散失。另一方面，在進行退火的處理過程後，更可進一步有效提升其微波介電性質，尤以Q×f值最為顯著。

關鍵字

多元元素 ； 鈣鈦礦 ； 微波介電陶瓷 ； 退火處理

並列摘要

ABO3 Complex perovskite ceramics,Ba(Zn1/3Ta2/3)O3 belong to B-site cation
1: 2 ordered arrangement of the complex perovskite,with high relative permittivity (εr),high quality factor (Q),and low temperature coefficient of resonator frequency (τf),are investigated on microwave dielectric materials extensively.In previous studies,the main research is to explore the B-site ordered structure changes in their microwave dielectric properties.This study proposes increases Nb5 +, Sb5 +, Co2 +, Sr2 +, to add equal-mole approach,attempts to change part of the A-site,B-site cation to achieve the purpose of diversification, and investigate the multi components for the density behavior,crystal structure,and the impact of microwave dielectric properties.
Ba(Zn1/6Co1/6Ta2/9Nb2/9Sb2/9)O3 at 1575℃/6 h can be sintered,density~6.57g/cm3, microwave properties of εr = 25,Q × f = 68,000 GHz,τf = -13 ppm / ℃;Compared with the Ba(Zn1/3Ta2/3)O3,not only reduces the sintering temperature, microwave applications, and more effectively reduce the electromagnetic energy loss.On the other hand,we can be further effectively improve the microwave dielectric properties during annealing process,especially in Q × f value.

並列關鍵字

BZT ； Multi-Elements ； Perovskites ； Microwave ceramic ； Annealing

參考文獻

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