Effect of Composition on the Structural and Electrical Properties of PMN-PT [Pb(Mg1/3Nb2/3)O3-PbTiO3] Based Ceramics

Öz

Polycrystalline samples of (1-x)PMN-xPT [Pb(Mg1/3Nb2/3)O3-PbTiO3] (x=0.30 to 0.39) piezoelectric ceramics were synthesized via a solid-state reaction route. Based on the previous literature, 5% mol excess MgO was used in order to eliminate the formation of unwanted pyrochlore phase. Microstructural and compositional analyses have been carried out using scanning electron microscope (SEM) and X-ray diffraction (XRD). Besides, electrical characterization was performed by using impedance analyzer and Berlincourt d33-piezometer. Formation of the pyrochlore phase was eliminated significantly by using excess MgO and one-step calcination method. XRD patterns indicated a transition from rhombohedral to tetragonal phase with increasing PT content. Effect of altering PMN-PT composition on the piezoelectric and dielectric properties was also investigated. The results showed that the rhombohedral and tetragonal phases coexisted at 0.30

Anahtar Kelimeler

• Piezoelectric Properties
• Dielectric Properties
• Perovskite
• Pyrochlore
• PMN-PT

PMN-PT [Pb(Mg1/3Nb2/3)O3-PbTiO3] ESASLI SERAMİKLERDE KOMPOZİSYONUN YAPISAL VE ELEKTRİKSEL ÖZELLİKLERE ETKİSİ

Öz

Bu çalışmada, çok kristalli (1-x)PMN-xPT [Pb(Mg1/3Nb2/3)O3-PbTiO3] (x=0,30-0,39) piezoelektrik seramikleri katı-hal reaksiyon yöntemi kullanılarak üretilmiştir. Üretim aşamasında istenilmeyen piroklor fazının oluşumunu engellemek için literatür çalışmalarından faydalanılarak %5 mol ekstra MgO tozu kullanılmıştır. Mikroyapı ve kompozisyon analizleri; taramalı elektron mikroskobu (SEM) ve X-ışınları kırınımı (XRD) ile, elektriksel karakterizasyon ise empendans analizörü ve Berlincourt d33-piezometre kullanılarak gerçekleştirilmiştir. Ekstra MgO ve tek kalsinasyon adımı kullanılarak piroklor faz oluşumunun büyük oranda engellendiği görülmüştür. XRD sonuçları PT miktarının artışı ile birlikte rombohedral fazdan tetragonal faza bir dönüşüm olduğunu ortaya koymuştur. Ayrıca, değişen PMN-PT kompozisyonunun dielektrik ve piezoelektrik özellikler üzerindeki etkisi de incelenmiştir. Deneysel sonuçlar, 0,30

Anahtar Kelimeler

• Piezoelektrik Özellikler
• Dielektrik Özellikler
• Perovskit
• Piroklor
• PMN-PT

Kaynakça

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