Exploring The Effects Of Annealing Temperature on Structural and Magnetic Properties of Low-Level Neodymium-Substituted Strontium Hexaferrite Synthesized Via Combustion Method

Abstract

This study investigates the impact of annealing temperature on the structural and magnetic attributes of Nd-substituted strontium hexaferrite (Sr0.9Nd0.1Fe12O19). The research demonstrated that as the annealing temperature increased, diffusion accelerated, thereby inducing a transformation into the SrFe12O19 phase and enhancing hard magnetic properties. The annealing process also significantly impacted the bonding structure, specifically affecting the presence of N-O bonds. Peak intensities escalated until 1100°C, subsequently declining due to the emergence of a composite structure (SrFe12O19+α-Fe2O3) arising from the Nd substitution. Importantly, the coercive field of the compound substantially increased post-annealing, attaining a peak at 1100°C (5.21 kOe) from 0.52 kOe pre-annealing, indicating that annealing amplifies resistance to demagnetization. Furthermore, both remanent magnetization and saturation magnetization values improved, reaching maximum values at 1100°C, measuring 40.2 emu/g and 61.5 emu/g, respectively.

Keywords

• Combustion synthesis
• Hexaferrite
• Magnetic properties
• Rare-earth substitution

Tavlama Sıcaklığının Yanma Yöntemiyle Sentezlenen Düşük Düzeyli Neodyum-İkame Edilmiş Stronsiyum Heksaferritin Yapısal ve Manyetik Özellikleri Üzerindeki Etkilerinin Keşfedilmesi

Abstract

Bu çalışma, tavlama sıcaklıklarının Nd ikameli stronsiyum hekzaferritin (Sr0.9Nd0.1Fe12O19) yapısal ve manyetik özellikleri üzerindeki etkisini incelemektedir. Araştırma, tavlama sıcaklığı arttıkça difüzyonun hızlandığını, böylece SrFe12O19 fazına dönüşümü tetiklediğini ve sert manyetik özellikleri geliştirdiğini gösterdi. Tavlama işlemi, özellikle N-O bağlarının varlığını etkileyerek, bağ yapısını da önemli ölçüde etkiledi. Tepe yoğunlukları 1100°C'ye kadar arttı, ardından Nd ikamesinden kaynaklanan bir bileşik yapının (SrFe12O19+α-Fe2O3) ortaya çıkması nedeniyle azaldı. Daha da önemlisi, bileşiğin zorlayıcı kuvveti, tavlama sonrası önemli ölçüde arttı ve tavlama öncesi 0.52 kOe'den 1100°C'de (5.21 kOe) bir zirveye ulaştı; Ayrıca, hem kalıcı mıknatıslanma hem de doygunluk mıknatıslanma değerleri iyileşerek 1100°C'de sırasıyla 40,2 emu/g ve 61,5 emu/g olan maksimum değerlere ulaştı.

Keywords

• Yanma sentezi
• Hekzaferrit
• Manyetik özellikler
• Nadir toprak ikamesi

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