一種用(Pb1/2Ni1/2)MnO3改性的PbTiO3壓電陶瓷
A NEW PbTiO3 PIEZOELEGTRIC CERAMICS MODIFIED WITH (Pb1/2Ni1/2) MnO3
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摘要: 正 1.引言 由于PbTiO3壓電陶瓷較難合成,因而使它的推廣應(yīng)用比PZT陶瓷晚。但是由于它的介電常數(shù)小(200左右),居里溫度高(490℃),故在高頻器件、紅外器件等方面有應(yīng)用前途。目前應(yīng)用較廣的(Ba,Pb)TiO3-PTC陶瓷的轉(zhuǎn)變溫度就是利用PbTiO3的高溫特性來提高的。 本文介紹的是利用PbTiO3的介電常數(shù)小、Kt大和頻率穩(wěn)定度高的特點,把它用作濾
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關(guān)鍵詞:
Abstract: A kind of PbTiO3 piezoelectrie ceramies modified with (Pb1/2 Ni1/2)MnO3 is recommended. It possesses fine VHF performances. Its coupling factor Kt is 0.48; mechanical quality factor QM is high; and frequeney stability is good.With the above mentioned material, We have assembled a 62 MHz band-pass filter which consists of seven vibrators. Its stop-band attenuation reaches 30 dB; insertion loss is 6 dB; the ripple ratio of pass band is 0.5 dB; while the rectangular ratio is 3.4.The depolarization phenomenon appearing in this kind of PbTiO3 ceramics is discussed. It is proposed howto overcome the depolarization phenomenon. And it is thought that this kind of ceramics may be an ideal material for developing PbTiO3 surface wave devices. -
池上清治,上田一朗,永田隆,電子通信學(xué)會論文志,55-C(1972), 166.[2]孫宣仁，Pb(Mn,Ti)O3和(Pb, Ba)(Mn,Ti)O3系統(tǒng)的PTC和NTC效應(yīng),廣州通訊研究所內(nèi)部資料.[3]上田一朗,小林茂,池上清治,National Tech. Rep., 18(1972),432. -
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