(x-a)/4O3 wherein denotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.;These low loss tunable ferroelectric compositions are especially useful in tunable microwave thin film devices which fall into three types: interdigital and trilayer capacitors, coplanar waveguides and microstrips."/>
Substituted barium titanate and barium strontium titanate ferroelectric compositions
This invention provides the three novel La,Fe, La,Cr and Sm,Fe substituted barium titanate solid solution ferroelectric compositions with the formula Ba1-xLnxTi1-xMxO3 wherein when Ln is La, M is Fe or Cr, when Ln is Sm, M is Fe and x is from about 0.02 to about 0.06 and mixtures thereof, the novel La,Fe substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-xFexO3 wherein y is greater than zero and less than about 0.6 and x is from about 0.01 to about 0.06 and the novel La,Al substituted barium strontium titanate solid solution ferroelectric compositions with the formula (Ba1-ySry)1-xLaxTi1-x/4-3a/4Ala(x-a)/4O3 wherein denotes a vacancy, y is greater than zero and less than about 0.6, a is from about 0.01 to about 0.06 and x is from 0.02 to about 0.10 with the proviso that x is greater than or equal to a.;These low loss tunable ferroelectric compositions are especially useful in tunable microwave thin film devices which fall into three types: interdigital and trilayer capacitors, coplanar waveguides and microstrips.
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机译:本发明提供了三种新型的La,Fe,La,Cr和Sm,Fe取代的钛酸钡固溶铁电组合物,其分子式为Ba 1-x Sub> Ln x Sub> Ti 1-x Sub> M x Sub> O 3 Sub>其中,当Ln为La,M为Fe或Cr时,当Ln为Sm,M为Fe且x来自约0.02至约0.06及其混合物,具有式(Ba 1-y Sub> Sr y Sub>)的新型La,Fe取代钛酸锶锶钡固溶体铁电组合物1-x Sub> La x Sub> Ti 1-x Sub> Fe x Sub> O 3 Sub>其中y大于零且小于约0.6,x为约0.01至约0.06,且新型La,Al取代钛酸锶锶钡固溶体铁电组合物的化学式为(Ba 1-y Sub> Sr y < / Sub>) 1-x Sub> La x Sub> Ti 1-x / 4-3a / 4 Sub> Al a Sub> <图片alt =“自定义字符” file =“ US07314842-20080101-P00001.GIF” he =“ 3.13mm” id =“ CUSTOM-CHARACTER-00001” imgContent =“字符” imgFormat =“ GIF” wi =“ 1.78mm” /> (xa)/ 4 Sub> O 3 Sub>其中,表示空位,y大于零且小于约0.6,a为约0.01至约0.06,x为0.02至约0.10,条件是x大于或等于a。这些低损耗可调谐铁电组合物特别适用于可调谐微波薄膜器件三种类型:叉指电容器和三层电容器,共面波导和微带。
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