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Title: Dielectric and magnetic characteristics of Ca1−xMnxMoO4 (0 ≤ x ≤ 0.15) nanomaterials
Authors: Groń, Tadeusz
Karolewicz, M.
Tomaszewicz, E.
Guzik, M.
Oboz, Monika
Sawicki, Bogdan
Duda, Henryk
Kukuła, Zenon
Keywords: Scheelite-type structure; Mn2+-doped nanomaterials; Combustion synthesis; Electrical properties; Magnetic properties
Issue Date: 2019
Citation: Journal of Nanoparticle Research, Vol. 21, Iss. 1 (2019), Art. No. 8
Abstract: Scheelite-type Ca1−xMnxMoO4 (x = 0.0,0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n-type electrical conductivity characteristic for insulators and low relative permittivity (εr < 15) decreasing with increasing Mn2+ content. CaMoO4 and Mn2+-doped nanomaterials are chemically compatible with Al and Ag electrodes and promising for lowtemperature co-fired ceramic applications. Magnetic studies showed, at room-temperature diamagnetism for pure CaMoO4, the balance between diamagnetism and paramagnetism for Ca1−xMnxMoO4 (x = 0.01) and paramagnetic behaviour when 0.05 ≤ x ≤ 0.15 as well as the short-range antiferromagnetic interactions growing in strength as Mn2+ content increases. The Landé factor fitting procedure showed a spin-only contribution to the magnetic moment. CaMoO4 matrix unexpectedly revealed the residual paramagnetism at low temperatures derived probably from the molybdenum ions having unpaired 4d electrons as well as a paramagneticdiamagnetic transition at 70 K.
DOI: 10.1007/s11051-018-4450-9
ISSN: 1572-896X
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