INFLUENCE OF LANTHANUM DOPING ON THE STRUCTURAL, MORPHOLOGICAL AND THERMAL CHARACTERISTICS OF NICKEL FERRITE
Journal Title: ROMANIAN JOURNAL OF TECHNICAL SCIENCES - APPLIED MECHANICS - Year 2017, Vol 62, Issue 3
Abstract
Lanthanum doped nickel ferrite – NiFe1-δLaδO4 has been synthesised by solid state reaction using nickel and iron oxides (NiO and Fe2O3) and lanthanum hydroxide (La(OH)3). The samples have been investigated by X-ray diffraction, in situ-high temperature X-ray diffraction, scanning electron microscopy, energy dispersive X-ray microanalysis, and differential scanning calorimetry. The amount of the lanthanum cations which enter in the cubic spinel structure is less than 1 % – related to 100 % of the one atom of Ni from the chemical formula of nickel ferrite – NiFe2O4. In the case of all doped samples that have been prepared a secondary phase with orthorhombic structure is resulting after the heat treatment: LaFeO3 – orthoferrite. Upon increasing the lanthanum amount in the starting samples, the amount of the orthoferrite increases also. The secondary phase follows the contour of the lanthanum doped ferrite grains.
Authors and Affiliations
TRAIAN FLORIN MARINCA, MARIUS CRISTIAN OLARU, BOGDAN VIOREL NEAMȚU, FLORIN POPA, IONEL CHICINAȘ
Keywords
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