LaCrO3 Perovskit Bileşiğinin Sentezi, Karakterizasyonu ve Elektriksel Admittans Çalışması

Ferroelektrik perovskit oksit LaCrO3’ü (LCO) katı hal reaksiyonu yöntemiyle sentezledik. Sentezlenen tozun yapısal ve kimyasal analizini yapmak için sırasıyla, taramalı elektron mikroskobu (SEM), enerji x-ışını dağılımı (EDX) ve X ışını kırınımı (XRD) yöntemleri kullanılmıştır. Perovskit oksit örneğinin elektriksel admittans özellikleri, dielektrik/empedans spektrometresi kullanılarak geniş bir frekans (1Hz- 10MHz) ve sıcaklık (-100 °C ile +100 °C) aralığında gerçekleştirilmiştir. Sonuçlar, LCO’ nun farklı aktivasyon enerjilerine sahip olduğunu ve hesaplanan aktivasyon enerjilerinin sırasıyla, Gdc& 1000/T grafiğinden 0.175 eV ve 0.220 eV, fmin&1000/T grafiğinden de 0.152 eV ve 0.197 eV olduğu görülmüştür. Sıcaklığa bağlı s parametresi, örtüşen büyük polaron tünelleme (OLPT), kuantum mekaniksel tünelleme (QMT) ve ilişkili bariyer hoplama (CBH) iletim mekanizması modellerinin LCO bileşiği için önerilebileceğini göstermiştir.

Synthesis, Characterization and Electrical Admittance Study of LaCrO3Perovskite Compound

We synthesized the ferroelectric perovskite oxide LaCrO3 (LCO) using solid-state reaction method. Scanning electron microscope (SEM),energy x-ray dispersive (EDX) and X-ray diffraction (XRD) have been employed to study structural and chemical analysis of synthesizedpowder, respectively. Electrical admittance properties of the perovskite oxide sample was performed in wide range frequency (1Hz-10MHz) and temperature (-100 °C to +100 °C) using dielectric/impedance spectrometer. The results showed that the LCO has differentactivation energies and the calculated activation energies are of 0.175 eV and 0.220 eV from the Gdc vs. 1000/T and 0.152 eV and 0.197eV from the fmin vs. 1000/T plots, respectively. The temperature-dependent exponent s showed that the overlapping large polaron tunneling(OLPT), quantum mechanical tunneling (QMT) and the correlated barrier hopping (CBH) conduction mechanism models can be suggestedfor the LCO compound.

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