PMN-PT-PMS SERAMİKLERİNDE SİNTERLEME SICAKLIĞI ETKİSİYLE YAPISAL VE ELEKTRİKSEL ÖZELLİKLERİN OPTİMİZASYONU

PMS [Pb(Mn1/3Sb2/3)O3] ile katkılanmış PMN-PT [Pb(Mg1/3Nb2/3)O-PbTiO3] üçlü piezoelektrik seramikleri (PMN-PT-PMS) 1100-1250 °C aralığında farklı sinterleme sıcaklıklarının kullanıldığı katı-hal reaksiyon yöntemi ile üretilmiştir. Sinterleme sıcaklığının kristal fazlar, mikroyapı ve elektriksel özellikler üzerindeki etkisi sistematik olarak incelenmiştir. Mikroyapı ve kompozisyon analizleri taramalı elektron mikrosko u SEM ve X-ışınları kırınımı XRD ile, elektriksel karakterizasyon ise indüktans-kapasitans-direnç ölöer LCR metre , empedans analizöru ve Berlincourt d33-piezometre kullanılarak gerçekleştirilmiştir. XRD ve SEM sonuçları, saf perovskit yapının ve homojen ir mikroyapının elde edilmesinde sinterleme sıcaklığının etkili olduğunu ortaya koymuştur. 1150 °C ve altındaki sinterleme sıcaklıklarında yoğunlaşma yetersiz olmakta ve saf perovskit yapı elde edilememekte, 1200 °C'nin üstündeki sıcaklıklarda ise kurşun oksitin uçuculuğu nedeniyle heterojen ir mikroyapı oluşmaktadır. Uygun sinterleme sıcaklığında elde edilen yüksek yoğunluk ve homojen mikroyapı; PMN-PT-PMS seramiklerinin yüksek piezoelektrik ve dielektrik davranış sergilemesini sağlamaktadır. Deneysel sonuçlar, 1175 °C'de 2 saat süre ile sinterlenmiş numunelerin optimum elektriksel özellikler d33=265 pC/N, KT=4745, kp=0,417, tan?=%2,5 ve Qm=222) sergilediğini göstermiştir

Optimizing Structural and Electrical Properties of PMN-PT-PMS Ceramics via Sintering Temperature

Pseudo-ternary piezoelectric ceramics of PMN-PT [Pb(Mg1/3Nb2/3)O3-PbTiO3] composition modified with PMS [Pb(Mn1/3Sb2/3)O3] were produced by solid-state sintering method using different temperatures in a range of 1100-1250 °C. The effect of sintering temperature on the crystal phases, microstructure and electrical properties were systematically investigated. Microstructural and compositional analyses have been carried out using scanning electron microscope (SEM) and X-ray diffraction (XRD). Besides, electrical characterization was performed using an inductance-capacitanceresistance (LCR) meter, impedance analyzer and a Berlincourt d-piezometer. XRD and SEM results indicated that the sintering temperature was effective on the formation of a homogeneous microstructure and a pure perovskite structure. Densification during sintering could not be completed and pure perovskite structure was not o tained at 1150 °C and lower sintering temperatures. Furthermore, sintering at temperatures higher than 1200 °C resulted in heterogeneous microstructure. The high dielectric and piezoelectric response of PMN-PT-PMS ceramics is considered to be a result of their high densities and homogeneous microstructure obtained via proper sintering condition. The results showed that the ceramic samples sintered at 1175 °C for 2 h possessed the optimum properties (d33=265 pC/N, KT=4745, kp=0.417, tan?=2.5%, Qm=222)

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