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Effects of Ion Substitution on Microwave Dielectric Characteristics Including the Pressure Dependence of Capacitance

离子取代对微波介电特性（包括电容的压力依赖性）的影响

基本信息

批准号：
09650739
负责人：
IKAWA Hiroyuki
金额：
$ 1.86万
依托单位：
Kanagawa Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

1. Effects of A-site Alkaline-Earth Substitution of Perovskite Oxide on Microwave Dielectric CharacteristicsThe main systems studied were as follows : (AィイD21-xィエD2A'ィイD2xィエD2)ZrOィイD23ィエD2. (AィイD21-xィエD2A'ィイD2xィエD2)(MgィイD21/3ィエD2TaィイD22/3ィエD2)OィイD23ィエD2, (AィイD21-xィエD2A'ィイD2xィエD2)(ZnィイD21/3ィエD2TaィイD22/3ィエD2)OィイD23ィエD2 (AA' = Ba, Sr, Ca) and further (BaィイD21-xィエD2A'ィイD2xィエD2)(BィイD21/2ィエD2B'ィイD21/2ィエD2OィイD23ィエD2 (A'=Ca, Sr B=Y,Nd : B'=Nb, Ta). Followings are summaries of this subtitle. That is, systematic differences are noted in the order of differences of ionic radii of the two alkaline-earth ions for the (BaィイD21-xィエD2CaィイD2xィエD2), (BaィイD21-xィエD2SrィイD2xィエD2), and (SrィイD21-xィエD2CaィイD2xィエD2) substitution systems. Dielectric constants increase sharp with x to have respective peak values at around the limit compositions of isomorphism substitutions of Ba by Ca for all systems studied. Further, and dielectric losses also increase sharp to have plateaus.2. Pressure Dependence of CapacitancePressure Dependences of Capacitance were measured for pellets of the (BaィイD21-xィエD2CaィイD2xィエD2)(MgィイD21/3ィエD2TaィイD22/3ィエD2)OィイD23ィエD2 system up to 1.5 Gpa from room temperature to 200℃. Capacitance decrease inclinations with pressure are sharper in an order of dielectric constant of the pellet.3. Elastic Properties and Dielectric PropertiesElastic parameters were evaluated by an acoustic method for ceramics of the (BaィイD21-xィエD2CaィイD2xィエD2)(MgィイD21/3ィエD2TaィイD22/3ィエD2)OィイD23ィエD2 system to find following relations. (1) The decrease in Young's modulus - mechanical softening - is correlated well with the increase in dielectric constant - dielectric softening. (2) A marked similarity is found between shear modulus and fQ for their composition dependences.

1. A位碱土金属取代对过氧化氢微波介电性能的影响研究的主要体系为：（A）ZrO_2D_21-x ZrO_2D_2A ′-xZrO_2D_2x ZrO_2）ZrO_（23）ZrO_2D_2。（A D21-x D2A ′ D2x D2）（Mg D21/3 D2Ta D22/3 D2）O D23 D2，（A D21-x D2A ′ D2x D2）（Zn D21/3 D2Ta D22/3 D2）O D23 D2（AA ′ = Ba，Sr，Ca）和进一步的（Ba：Sr D21-x Sr D2A 'Nd：D2x Sr D2）（B Sr D21/2 Sr D2B' Nd：D21/2 Sr D2O）（A '= Ca，Sr B=Y，Nd：B'= Nb，Ta）。以下是这个副标题的摘要。也就是说，对于（Ba D21-x D2Ca D2 x D2）、（Ba D21-x D2 Sr D2 x D2）和（Sr D21-x D2Ca D2 x D2）取代系统，系统差异以两种碱土离子的离子半径的差异的顺序被注意到。介电常数随x的增加而急剧增加，在所有研究的系统中，在Ba被Ca类质同晶取代的极限组合物附近具有各自的峰值。此外，介电损耗也急剧增加，有平台.在室温至200℃范围内，测量了（Ba ↓ [2] O ↓ [23] O ↓ [21-x] Ca ↓ [2] O ↓ [23] O ↓ [24] O ↓ [25] O ↓ [23] O ↓ [25] O ↓ [24] O ↓ [25] O ↓ [26] O ↓ [25] O ↓ [电容随压力的减小趋势按颗粒介电常数的顺序逐渐减小.弹性性能和介电性能通过声学方法评估（Ba_（21-x）Ca_（22）D_2Ca_（22）D_2Ca_（22）D_2Ca_（22）D_2Ta_（22））O_（23）D_2Ta_（23）D_2系统陶瓷的弹性参数，以发现以下关系。(1)杨氏模量的降低-机械软化-与介电常数的增加-介电软化很好地相关。(2)一个显着的相似性之间的剪切模量和fQ的组成依赖性。