Structural, Electrical, and Magnetic Properties of High-Temperature-Sintered La1-xNaxMnO3 (0.05 <= x <= 0.35) Compounds
JOURNAL OF ELECTRONIC MATERIALS, cilt.44, sa.1, ss.326-331, 2015 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 44 Sayı: 1
- Basım Tarihi: 2015
- Doi Numarası: 10.1007/s11664-014-3514-6
- Dergi Adı: JOURNAL OF ELECTRONIC MATERIALS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.326-331
- Anahtar Kelimeler: Sintering temperature, impurity, concentration, magnetic properties, magnetic entropy, TRANSPORT-PROPERTIES, MICROSTRUCTURE
- Anadolu Üniversitesi Adresli: Evet
Özet
The structural, electric, and magnetic properties of La1-xNaxMnO3 (0.05 <= x <= 0.35) compounds have been investigated. The compounds were prepared by a standard sol-gel method then sintered at 1400 degrees C for 24 h. The crystal structures were orthorhombic (Pbnm) for all Na concentrations, and the unit cell volumes, determined from the x-ray diffraction data, tended to decrease with increasing Na content. The high-temperature-sintering process resulted in a grainy structure with grain sizes of 5-30 mu m. The Curie temperature (T-C) increased with increasing Na concentration up to x = 0.20, then decreased with further increase in Na concentration. The maximum magnetic entropy change (-Delta S-M) under a field change of 1.6 T was calculated to be similar to 3 J/kg K for the sample containing 15% Na.