Morphology, microstructure, and surface area of La-added MgFe 2 O 4 powder

Kenji Obata, Akane Doi, Maiko Nishibori, Kengo Shimanoe, Takuya Suzuki, Shigenori Matsushima

Research output: Contribution to journalArticle

Abstract

La-added and pure MgFe 2 O 4 powders were prepared from a malic acid complex, and the effect of La-adding on the microstructure and specific surface area of MgFe 2 O 4 powder were examined. There were no traces of impurity phases for pure MgFe 2 O 4 powder in the X-ray diffraction measurement after calcination in the range of 600 to 800°C. When La atoms were added to MgFe 2 O 4 , the crystallite growth of MgFe 2 O 4 was suppressed remarkably, resulting in a higher specific surface area in comparison with the pure material, and the lattice volume increased. X-ray photoelectron spectroscopy measurements showed that the binding energies of Mg 2s, Fe 2p, O 1s, and La 3d signals were in good agreement with the Mg 2+ , Fe 3+ , O 21 , and La 3+ valence states, respectively. Scanning electron microscopy observations revealed that MgFe 2 O 4 powder shows an aggregation of granular particles and that the individual particles are tightly interconnected with each other, whereas smaller particles compared with pure MgFe 2 O 4 were observed for the La-added powder. It was found from the N 2 adsorption measurement, moreover, that the amount of mesopore increases with La addition.

Original languageEnglish
Pages (from-to)402-407
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume126
Issue number5
DOIs
Publication statusPublished - May 1 2018

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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