SINGLE STEP SOLID-STATE SYNTHESIS OF LANTHANUM MOLYBDATE

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AVCIOĞLU S., Mutuk T., Gürbüz M., Cevik S.

ADVANCES IN MATERIALS SCIENCE, vol.19, no.3, pp.46-54, 2019 (ESCI) identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 3
  • Publication Date: 2019
  • Doi Number: 10.2478/adms-2019-0016
  • Journal Name: ADVANCES IN MATERIALS SCIENCE
  • Journal Indexes: Emerging Sources Citation Index (ESCI)
  • Page Numbers: pp.46-54
  • Keywords: heat treatment, lanthanum molybdate, phase assembly, solid state synthesis, LA2MO2O9, MICROSTRUCTURE, PLATFORM, HARDNESS
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

In this study, LaxMoyOz powders were synthesized by a cost-effective solid-state synthesis method. Four different heating cycles were designed to investigate the effects of synthesis temperature and holding time on lanthanum molybdate (LMO) formation, phase assemblies, particle size and morphology. X-Ray Diffraction (XRD) and scanning electron microscopy (SEM) studies were performed to observe crystal structure and particle morphology of synthesized powders. The results showed that nearly ninety percent beta - La2Mo2O9 (43,3 nm crystal size) phase was obtained at 1000 degrees C for 6 h holding time. Longer holding times at 1000 degrees C favor more oxygen-rich compounds which cause recrystallization of various new crystalline phases. The grain size of the synthesized powder was increased from 0,2 mu m to 1,5 mu m with increasing holding time. In summary, it is possible to manufacture LMO powders rich in beta - La2Mo2O9 by one - step solid - state synthesis method. The phase assembles and particle size of LMO powders could also be tailored by optimization of heat treatment cycle.