(1-x).Pr0.67Ca0.33MnO3/x.Pr0.67Sr0.33MnO3 (x=0, 0.25, 0.50, 0.75 ve 1.0) Kompozit Malzemelerinin Yapısal, Morfolojik ve Elektriksel Özelliklerinin İncelenmesi

Yıl 2022, Cilt: 10 Sayı: 4, 1736 - 1747, 25.10.2022

Atilla Coşkun , Benay Perk Okan Avcı Barış Altan

Öz

Bu çalışmada sol-jel yöntemi kullanılarak hazırlanan (1-x).Pr0.67Ca0.33MnO3/x.Pr0.67Sr0.33MnO3 (x=0, 0.25, 0.50, 0.75 ve 1.0) kompozit malzemelerinin yapısal, morfolojik ve elektriksel özellikleri incelenmiştir. Ana ve kompozit malzemelerin x-ışınları kırınım (XRD) desenlerinden, kristal yapı simetrilerinde herhangi bir değişiklik meydana gelmediği gözlenmiştir. Kompozit malzemelerin ana pikinin, Pr0.67Ca0.33MnO3 ve Pr0.67Sr0.33MnO3 bileşiklerinin ana pikleri arasında optimize olduğu bulunmuştur. Atomik kuvvet mikroskobu çalışmalarından, bileşiklerin yüzeyindeki tane oluşumlarının aynı doğrultuda olduğu ve çok fazla farklılıkların olmadığı bulunmuştur. Taramalı elektron mikroskobu (SEM) çalışmaları Pr0.67Ca0.33MnO3 ve Pr0.67Sr0.33MnO3 bileşiklerinin yüzey morfolojilerinin birbirlerinden farklı olduğunu göstermiştir Elektriksek özdirenç ölçümlerinden, Pr0.67Ca0.33MnO3 bileşiğinin yarıiletken ve Pr0.67Sr0.33MnO3 bileşiğinin 199,1 K’in altında iletkenlik özellik gösterdiği ortaya çıkarılmıştır. Yarıiletken özellik gösteren Pr0.67Ca0.33MnO3 bileşiğine %25 oranında Pr0.67Sr0.33MnO3 bileşiği katıldığında elde edilen kompozit malzemenin, 88,4 K’in altında iletkenlik özellik kazandığı ve Pr0.67Sr0.33MnO3 fazının hacimsel oranının artması sonucunda TIM geçiş sıcaklığının yüksek sıcaklıklara doğru (184,8 K) kaydığı bulunmuştur.

Anahtar Kelimeler

Manyetokalorik etki, X-ışınları kırınım, Sol-jel yöntemi

Investigation of Structural, Morphological and Electrical Properties of (1-x).Pr0.67Ca0.33MnO3/x.Pr0.67Sr0.33MnO3 (x=0, 0.25, 0.50, 0.75 and 1.0) Composite Materials

Öz

In this study, (1-x).Pr0.67Ca0.33MnO3/x.Pr0.67Sr0.33MnO3 (x=0, 0.25, 0.50, 0.75 and 1.0) composite materials were prepared using the sol-gel method and the structural, morphological, and electrical properties were investigated. From the x-ray diffraction (XRD) analysis, was observed that there was no change in the crystal structure symmetries of the pure and composite materials. It was found that the main peak of the composite materials changing between the main peaks of Pr0.67Ca0.33MnO3 and Pr0.67Sr0.33MnO3 compounds. From atomic force microscopy studies, it has been found that the grain formations on the surface of the compounds are in the same direction and there is not much difference between them. Scanning electron microscopy (SEM) studies have shown that the surface morphologies of Pr0.67Ca0.33MnO3 and Pr0.67Sr0.33MnO3 compounds differ from each other. From the electrical resistivity measurements, it was revealed that the Pr0.67Ca0.33MnO3 compound was a semiconductor and the Pr0.67Sr0.33MnO3 compound showed a conductivity behavior below 199.1 K. When 25% of the Pr0.67Sr0.33MnO3 compound is added to the Pr0.67Ca0.33MnO3 compound, which has semiconductor properties, the obtained composite material was gained conductivity below 88.4 K. As a result of the increase in the volumetric ratio of the Pr0.67Sr0.33MnO3 phase, the TIM transition temperature has shifted towards higher temperatures (184.8 K).

Anahtar Kelimeler

Magnetocaloric effect, X-ray diffraction, Sol-gel method

Kaynakça

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