EXPERIMENTAL INVESTIGATION OF STRUCTURAL PROPERTIES AND MAGNETIC REFRIGERATION PERFORMANCE OF Gd AND La0.75Ba0.25MnO3 COMPOUNDS

Arda Zaim; Haydar Aras; Cumhur Gökhan Ünlü

Makale detayları

EXPERIMENTAL INVESTIGATION OF STRUCTURAL PROPERTIES AND MAGNETIC REFRIGERATION PERFORMANCE OF Gd AND La0.75Ba0.25MnO3 COMPOUNDS

Yazarlar:

Arda Zaim | Haydar Aras | Cumhur Gökhan Ünlü

Yayıncı:

Eskişehir Osmangazi University

Ana Başlıklar:

Enerji Üretimi | Dönüşüm ve Depolama (Kimyasal ve Elektiksel hariç) | Makine Mühendisliği (Diğer)

Dergi:

Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi Vol.33 Issue 1, pp.1648-1655

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001344870

pISSN:

2630-5712

Anahtar kelimeler:

Özet:

 In this study, the structural properties and magnetic cooling performance of Gd element and La0.75Ba0.25MnO3 perovskite manganite compound used as magnetocaloric material in magnetic cooling systems operating at temperatures close to room temperature were experimentally investigated. La0.75Ba0.25MnO3 perovskite manganite compound was synthesized by sol-gel method, and the structural properties of both magnetocaloric materials were examined in detail by performing SEM and EDX analysis. n SEM analysis, it was determined that the grain sizes for Gd element did not have a homogeneous distribution, the grain sizes varied between 2-20 µm and had a cubic-like hard-cornered structure; In La0.75Ba0.25MnO3 perovskite manganite compound, a smaller grain size, spherical geometry, sponge-like structure, homogeneous distribution and low void structure were observed. In the EDX analysis, it was determined that the structure in the Gd element was largely composed of Gd, and the desired structure characterization was obtained in the perovskite manganite compound synthesized by the sol-gel method. In the time-dependent temperature change experiments carried out under a magnetic field density of 1.2 T, a temperature difference of 2.204 K was obtained in the Gd element and 1.472 K in the La0.75Ba0.25MnO3 perovskite manganite compound at φ15 defined as the critical utilization factor after 250 cycles.

 In this study, the structural properties and magnetic cooling performance of Gd element and La0.75Ba0.25MnO3 perovskite manganite compound used as magnetocaloric material in magnetic cooling systems operating at temperatures close to room temperature were experimentally investigated. La0.75Ba0.25MnO3 perovskite manganite compound was synthesized by sol-gel method, and the structural properties of both magnetocaloric materials were examined in detail by performing SEM and EDX analysis. n SEM analysis, it was determined that the grain sizes for Gd element did not have a homogeneous distribution, the grain sizes varied between 2-20 µm and had a cubic-like hard-cornered structure; In La0.75Ba0.25MnO3 perovskite manganite compound, a smaller grain size, spherical geometry, sponge-like structure, homogeneous distribution and low void structure were observed. In the EDX analysis, it was determined that the structure in the Gd element was largely composed of Gd, and the desired structure characterization was obtained in the perovskite manganite compound synthesized by the sol-gel method. In the time-dependent temperature change experiments carried out under a magnetic field density of 1.2 T, a temperature difference of 2.204 K was obtained in the Gd element and 1.472 K in the La0.75Ba0.25MnO3 perovskite manganite compound at φ15 defined as the critical utilization factor after 250 cycles.

 In this study, the structural properties and magnetic cooling performance of Gd element and La0.75Ba0.25MnO3 perovskite manganite compound used as magnetocaloric material in magnetic cooling systems operating at temperatures close to room temperature were experimentally investigated. La0.75Ba0.25MnO3 perovskite manganite compound was synthesized by sol-gel method, and the structural properties of both magnetocaloric materials were examined in detail by performing SEM and EDX analysis. n SEM analysis, it was determined that the grain sizes for Gd element did not have a homogeneous distribution, the grain sizes varied between 2-20 µm and had a cubic-like hard-cornered structure; In La0.75Ba0.25MnO3 perovskite manganite compound, a smaller grain size, spherical geometry, sponge-like structure, homogeneous distribution and low void structure were observed. In the EDX analysis, it was determined that the structure in the Gd element was largely composed of Gd, and the desired structure characterization was obtained in the perovskite manganite compound synthesized by the sol-gel method. In the time-dependent temperature change experiments carried out under a magnetic field density of 1.2 T, a temperature difference of 2.204 K was obtained in the Gd element and 1.472 K in the La0.75Ba0.25MnO3 perovskite manganite compound at φ15 defined as the critical utilization factor after 250 cycles.

 Çalışmada oda sıcaklığına yakın sıcaklıklarda çalışan manyetik soğutma sistemlerinde manyetokalorik malzeme olarak kullanılan Gd elementinin ve La0.75Ba0.25MnO3 perovskit manganit bileşiğinin yapısal özellikleri ve manyetik soğutma performansı deneysel olarak incelenmiştir. La0.75Ba0.25MnO3 perovskit manganit bileşiği sol-jel yöntemiyle sentezlenmiş, her iki manyetokalorik malzemenin yapısal özellikleri SEM ve EDX analizi gerçekleştirilerek detaylı bir şekilde ele alınmıştır. SEM analizinde Gd elementi için tane boyutlarının homojen bir dağılıma sahip olmadığı, tane boyutlarının 2-20 µm aralığında değiştiği ve kübik benzeri formda sert köşeli bir yapıda olduğu belirlenmiş olup; La0.75Ba0.25MnO3 perovskit manganit bileşiğinde ise daha küçük tane boyutlu, küresel geometride, süngerimsi yapıda, homojen dağılımlı ve düşük boşluklu bir yapı gözlenmiştir. EDX analizinde Gd elementinde yapının tamamen Gdden oluştuğu, sol-jel yöntemiyle sentezlenen perovskit manganit bileşiğinde istenilen yapı karakterizasyonunun elde edildiği tespit edilmiştir. 1.2 T manyetik akı yoğunluğunda gerçekleştirilen zamana bağlı sıcaklık değişimi deneylerinde 250 çevrim sonrasında kritik kullanım faktörü olarak tanımlanan φ15de; Gd elementinde 2.204 K, La0.75Ba0.25MnO3 perovskit manganit bileşiğinde ise 1.472 K sıcaklık farkı elde edilmiştir.

Makale detayları

EXPERIMENTAL INVESTIGATION OF STRUCTURAL PROPERTIES AND MAGNETIC REFRIGERATION PERFORMANCE OF Gd AND La0.75Ba0.25MnO3 COMPOUNDS

Yazarlar:

Arda Zaim | Haydar Aras | Cumhur Gökhan Ünlü

Yayıncı:

Eskişehir Osmangazi University

Ana Başlıklar:

Enerji Üretimi | Dönüşüm ve Depolama (Kimyasal ve Elektiksel hariç) | Makine Mühendisliği (Diğer)

Dergi:

Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi Vol.33 Issue 1, pp.1648-1655

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001344870

pISSN:

2630-5712

Magnetocalorik Materials

Magnetocaloric Effect

Magnetic RefrigerationManyetokalorik Malzeme

Manyetokalorik Etki

Manyetik Soğutma

Sayı

Makale detayları

EXPERIMENTAL INVESTIGATION OF STRUCTURAL PROPERTIES AND MAGNETIC REFRIGERATION PERFORMANCE OF Gd AND La0.75Ba0.25MnO3 COMPOUNDS

Yazarlar: Arda Zaim | Haydar Aras | Cumhur Gökhan Ünlü

Yayıncı: Eskişehir Osmangazi University

Ana Başlıklar: Enerji Üretimi | Dönüşüm ve Depolama (Kimyasal ve Elektiksel hariç) | Makine Mühendisliği (Diğer)

Dergi: Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi Vol.33 Issue 1, pp.1648-1655

Belge Tipi: Makale

Yayın Tarihi: 4/2025

Belge Dili: Türkçe

Document ID (Org No.): 2001344870

pISSN: 2630-5712

Magnetocalorik Materials

Magnetocaloric Effect

Magnetic RefrigerationManyetokalorik Malzeme

Manyetokalorik Etki

Manyetik Soğutma

Sayı

Yazarlar:

Arda Zaim | Haydar Aras | Cumhur Gökhan Ünlü

Yayıncı:

Eskişehir Osmangazi University

Ana Başlıklar:

Enerji Üretimi | Dönüşüm ve Depolama (Kimyasal ve Elektiksel hariç) | Makine Mühendisliği (Diğer)

Dergi:

Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi Vol.33 Issue 1, pp.1648-1655

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001344870

pISSN:

2630-5712