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  • 學位論文

以反應燒結法研製PNN與PNN-PT弛緩性鐵電陶瓷

Preparation of PNN and PNN-PT Relaxor Ferroelectric Ceramics by a Reaction-sintering Process

指導教授 : 劉依政

摘要


本論文主要內容為以反應燒結法研製Pb(Ni1 / 3Nb2 / 3)O3 (PNN) 與 0.72Pb(Ni 1 / 3Nb2 / 3)O3-0.28PbTiO3 (PNNT)弛緩性鐵電陶瓷, 在本研究中, 我們 所使用製程為一種無需煆燒而直接燒結混合粉末之反應燒結法。用反應燒結法 製造當量PNN、PNNT 鈣鈦礦陶瓷體時, 在沒有煆燒的情況下, 混合PbO、 Nb2O5、Ni(NO3 ) 2 6H2O 及TiO2 直接壓模成型而後燒結。PNN 在1150~1230oC 燒結2 和4 小時有pyrochlore 相生成, 1250oC 時為100% perovsk i te。當加入 5wt% PbO 產生含鉛燒結氣氛時於1150∼ 1250oC 燒結2 與4 小時均可得到 100% perovsk i te PNN,1200oC 燒結2 小時有最佳密度8.51g/cm3 (理論密度值之 99.3%)。PNNT 在1230~1270oC 燒結2 和4 小時, 也是有少量pyrochlore 相存 在, 當加入3wt% PbO 補償後可得100% perovskite 相, 1230oC 燒結4 小時有 最大密度8.49g/cm3 (理論密度值之99.8%)。

關鍵字

弛緩性鐵電 陶瓷 PNN PNN-PT

並列摘要


Pb(Ni1 / 3Nb2 / 3)O3 (PNN) and 0.72Pb(Ni1 / 3Nb2 / 3)O3-0.28PbTiO3 (PNNT) reaction-sintering process were investigated. Wi t h o u t a n y c a l c i n a t i o n , t h e mixyure of PbO, Ni(NO3 ) 2, Nb2O5 and TiO2 was pressed and sintered directly. Pyrochlore phase was observed in PNN cerami c s s i n t e r e d a t 1150-1230o C f o r 2 and 4 hours. 100% perovskite PNN could be obtained at 1250o C sintering. As 5wt% PbO was added to compensate the PbO loss, 100% perovskite PNN ceramic s were obtained at 1150-1250oC sintering for 2 and 4 hours. Density of 8.51g/cm3 (99.3% of theoretical value) was obtained after sintered at 1230o C f o r 2 h . Pyrochlore phase was also observed in PNNT ceramics sintered at 1230-1270oC for 2 and 4 hours. As 3wt% PbO was added, 100% perovskite PNNT cerami c s were obtained at 1230-1270oC sintering for 2 and 4 hours. Density of 8.49g/cm3 (99.8% of theoretical value) was obtained after sintered at 1230o C f o r 4 h .

並列關鍵字

Ferroelectric Ceramic Relaxor PNN PNN-PT

參考文獻


[ 1 ]. S. Nomura and K. Uchi n o , “Recent Applications of PMN-Based
197-202 (1983).
Pro p e r t i e s o f Lead Magnesium Niobate Ceramics,” Am. Ceram.
Actuators, ” Am. Ceram. Soc. Bull., 7 0 [ 1 ] 117-19 (1991).
Ceramic Process of the Ferroelectric Perovskites:

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