Mn-bölgesi Katkılamanın La0.62Bi0.05Ca0.33Mn1-xRuxO3 Manganit Sisteminin Manyetokalorik Özellikleri Üzerine Etkileri

Abstract

Bu çalışma katıhal reaksiyon yöntemiyle elde edilen La0.62Bi0.05Ca0.33Mn1-xRuxO3 (x=0.0, 0.1 ve 0.2) manganit bileşiklerinde Ru elementi katkısının malzemelerin manyetokalorik özellikleri (MC) üzerindeki etkilerini bildirmektedir. XRD analizi, numunelerin ortorombik (Pnma uzay grubu) yapıda kristalleştiğini göstermiştir. Örneklerin manyetik faz geçiş sıcaklıkları 100 Oe uygulanan alan altında katkısız x = 0.0 örneği için 221K, x = 0.1 ve x = 0.2 örnekleri için sırasıyla 215 ve 207K olarak belirlenmiştir. Arrott eğrileri tüm örneklerin ikinci dereceden faz geçişi sergilediğini doğrulamaktadır. 5 T alan altında -∆S_M^max değerleri x = 0.0, 0.1 ve 0.2 örnekleri için sırasıyla 7.55, 3.51 ve 2.69 J/kgK olarak hesaplanmıştır. Örneklerin göreli soğutma güç (RCP) değerlerinde bir azalma gözlemlenmiştir. Ru katkısının örneklerin geçiş sıcaklık ve manyetik entropi değişim değerlerinde bir düşüş gösterdiği sonucuna ulaşılmıştır.

Keywords

• Manyetik entropi değişimi
• manyetokalorik etki
• manyetik soğutma
• perovskitler.

Effects of Mn-site doping on the magnetocaloric properties of La0.62Bi0.05Ca0.33Mn1-xRuxO3 manganite system

Abstract

This study reports the effects of Ru element doping in La0.62Bi0.05Ca0.33Mn1-xRuxO3 (x=0.0, 0.1 and 0.2) manganite compounds on the magnetocaloric (MC) properties of materials obtained by solid-state method. XRD analysis showed that the samples crystallized in orthorhombic structure (with Pnma space group). The magnetic phase transition temperatures of the samples were determined from the thermomagnetic curves as 221 K for x = 0.0 sample and 215 and 206 K for x = 0.1 and x = 0.2 samples, respectively, under 100 Oe applied field. Arrott plots confirm that the type of magnetic phase transition is second-order phase transition. The -∆S_M^max values were calculated as 7.55, 3.51 and 2.69 J/kgK for x = 0.0, 0.1 and 0.2 samples, respectively. Relative cooling power (RCP) values decrease with Ru doping. It was concluded that the Ru additive had an effect on reducing the transition temperatures and magnetic entropy change values of the samples.

Keywords

• Magnetic entropy change
• magnetocaloric effect
• magnetic refrigeration
• perovskites.

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