The Sintering Temperature Effect on Magnetocaloric Effect in La2MnNiO6 Double Perovskite Manganite Material

Öz

La2NiMnO6 double-perovskite manganite samples were produced with sol-gel method to investigate structural, morphological, magnetic and magnetocaloric properties. They were sintered at 1000 and 1100 ̊C for LNM-1000 and LNM-1100 sample, respectively. The crystal structure of the samples was determined as Rhombohedral with R3𝑐 space group. Morphological analyses revealed that LNM-1000 sample included different polygonal shaped grains with small magnitudes, while grain boundaries became unclear for the LNM-1100 sample. The Curie temperatures were determined as 200 and 220 K while effective magnetic moment values were calculated as 1.75 and 2.13 for LNM-1000 and LNM-1100 samples, respectively. Arrot plots showed that samples exhibited second order magnetic phase transition. Maximum magnetic entropy change and relative cooling power values were calculated as 0.21, 0.25 J kg-1 K-1 and 46.2, 50.5 J kg-1 for LNM-1000 and LNM-1100 samples, respectively. Although the samples have the Curie temperature around sub-room temperature range that is much higher than Gd2NiMnO6 (5 K) and they have second order magnetic phase transition, relatively low value of magnetic entropy change values of these samples limits their usage as a magnetic coolant material.

Anahtar Kelimeler

• Magnetic refrigeration
• Magnetocaloric effect
• Curie temperature
• Double perovskite manganites

Destekleyen Kurum

Adıyaman Üniversitesi Bilimsel Araştırmalar Koordinasyon Birimi

Proje Numarası

FEFYL/2021-0004.

Teşekkür

This work is supported by the Research Project Unit of the Adıyaman University Under Grant Contract no FEFYL/2021-0004.

Öz

La2NiMnO6 çift peroksit manganit örnekleri yapısal, morfolojik, manyetik ve manyetokalorik özelliklerini araştırmak için sol-jel yöntemi ile üretildi. LNM-1000 ve LNM- 1100 numuneleri sırasıyla 1000 ve 1100 ̊C'de sinterlenmişlerdir. Numunelerin kristal yapısı R3c uzay grubuna sahip Rhombohedral olarak belirlenmiştir. Morfolojik analizler, LNM-1000 numunesinin küçük boyutlara sahip farklı poligonal şekilli taneler içerdiğini, LNM-1100 numunesinde ise tane sınırlarının belirsizleştiğini ortaya koymuştur. Curie sıcaklıkları 200 ve 220 K olarak belirlenirken, etkin manyetik moment değerleri LNM-1000 ve LNM-1100 numuneleri için sırasıyla 1.75 ve 2.13 olarak hesaplanmıştır. Arrot grafikleri örneklerin ikinci dereceden manyetik faz geçişi sergilediğini göstermiştir. Maksimum manyetik entropi değişimi ve bağıl soğutma gücü değerleri LNM-1000 ve LNM-1100 numuneleri için sırasıyla 0.21, 0.25 J kg-1 K-1 ve 46.2, 50.5 J kg-1 olarak hesaplanmıştır. Örneklerin Curie sıcaklığının oda sıcaklığının altında Gd2NiMnO6'dan (5 K) çok daha yüksek olması ve ikinci dereceden manyetik faz geçişine sahip olması gibi avantajlarına rağmen, bu örneklerin manyetik entropi değişim değerlerinin nispeten düşük olması manyetik soğutucu malzeme olarak kullanımlarını sınırlamaktadır.

Anahtar Kelimeler

• Manyetik soğutma
• Manyetokalorik etki
• Curie sıcaklığı
• Çift- katmanlı perovskitler

Proje Numarası

FEFYL/2021-0004.

Kaynakça

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