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Title: Exploring the novel pyrovanadate series K2Mn1-xCoV2O7
Authors: Smith, M
Avdeev, M
Sauceda Flores, J
Keywords: Alkali metals
Coherent scattering
Crystal structure
Oxygen compounds
Photon emission
Three-dimensional lattices
Transition element compounds
Issue Date: 4-Feb-2020
Publisher: Australian Institute of Physics
Citation: Smith, M., Avdeev, M., Flores, J. S., Ulrich, C., & Söhnel, T. (2020). Exploring the novel pyrovanadate series K2Mn1-xCoV2O7. Poster presented to the 44th Condensed Matter and Materials Meeting, Holiday Inn, Rotorua, New Zealand, 4-7 February 2020, (p.80). Retrieved from:
Abstract: Materials with the Melilite-type structure have been intensively studied throughout the years due to their interesting piezoelectric, electrochemical, luminescent, magnetic, and structural properties [1,2]. Many oxides with the general formula A2BC2O7 crystallise into the melilite family of minerals, where A is a large cation from group one or two; B is typically a first-row transition metal with four-fold coordination; and C is a smaller cation like Si, V, P, or Ge [1-4]. The Pyrovanadate (A2BV2O7) compounds K2MnV2O7 and K2CoV2O7 exist in the melilite group, with the tetragonal space group P4̅21m, consisting of alternating layers of K+ ions in between MV2O72- sheets comprised of connected MO4 and VO4 tetrahedra (Figure 1) [1,2]. The crystal structure K2Mn1-xCoV2O7 was determined from the rietveld refinement of powder X-ray diffraction (PXRD) patterns. Refinement of PXRD patterns showed a systematic shift in reflections with increasing cobalt content, consistent with an increase of lattice constant parameters. UV-Vis measurements show how the addition of cobalt leads to an additional electronic transition whose intensity increases with increasing cobalt concentration. Tauc plots revealed that the material has a direct band gap of approximately 2 eV. Photoluminescent measurements of the cobalt doped species revealed promising results for white light emitters due to electronic transitions across the cobalt tetrahedra and pyrovanadate units. First magnetic measurements indicate a long-range antiferromagnetic ordering at just over 2 K for K2CoV2O7.
Description: Within the text J. S. Flores is listed as an author. The profile on Sydney University and ORCID identifies the authors as Jorge Arturo Sauceda Flores. Earlier in this publication the author is listed as J. Sauceda Flores. The author is listed in the author list as Sauceda Flores, JS, and the citation is as it appears.
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