Synthesis, Characterization and Electrical Admittance Study of LaCrO3 Perovskite Compound

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 (1Hz10MHz) 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, f min&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.

Anahtar Kelimeler:

LaCrO3, Perovskit Oksit, Admittans, Aktivasyon Enerjisi

Synthesis, Characterization and Electrical Admittance Study of LaCrO3 Perovskite 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 synthesized powder, respectively. Electrical admittance properties of the perovskite oxide sample was performed in wide range frequency (1Hz10MHz) and temperature (-100 °C to +100 °C) using dielectric/impedance spectrometer. The results showed that the LCO has different activation 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 0.197 eV from the f min 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 suggested for the LCO compound.

Keywords:

LaCrO3, Perovskite Oxide, Admittance, Activation Energy,

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