Synthesis and magnetic susceptibility of the rutile phase MnTaO4
2000 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 10, no 9, 2197-2200 p.Article in journal (Refereed) Published
The Mn3+-containing oxide MnTaO4 was synthesized at 1050 degrees C and 2 kbar partial oxygen gas pressure. It has a rutile-type structure, space group P4(2)/mnm, with a = 4.7189(3), c = 2.9843(3) Angstrom, and a statistical distribution of Mn/Ta. The structure was refined by the Rietveld method using both X-ray and neutron powder diffraction. The refinements, and energy-dispersive X-ray microanalysis, indicate that the phase may contain a small amount of Mn4+ and have the actual composition Mn1.08(2)Ta0.92(2)O4. The magnetic susceptibility shows a maximum at 16 K and Curie-Weiss behavior at higher temperatures, with mu(eff) = 5.11(4) mu(B) per Mn atom. The susceptibility is consistent with spin-glass behavior: (i) the temperature at the susceptibility maximum is frequency-dependent and (ii) field cooled and zero-field cooled susceptibility curves differ below the maximum. Neutron powder diffraction data collected at 10 K does not show any sharp magnetic reflections, but a very broad reflection, with a full width at half maximum height of 7 degrees, at a position corresponding to the 100 reflection is seen.
Place, publisher, year, edition, pages
2000. Vol. 10, no 9, 2197-2200 p.
x-ray-powder, diffraction data, refinement, electron, mn3ta2o8
IdentifiersURN: urn:nbn:se:kth:diva-19988ISI: 000088933200037OAI: oai:DiVA.org:kth-19988DiVA: diva2:338681
QC 201005252010-08-102010-08-10Bibliographically approved