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Title: Effect of Gd3+ substitution on thermoelectric power factor of paramagnetic Co2+-doped calcium molybdato-tungstates
Authors: Sawicki, Bogdan
Oboz, Monika
Groń, Tadeusz
Kukuła, Zenon
Pawlus, Sebastian
Nowok, Andrzej
Duda, Henryk
Karolewicz, Marta
Tomaszewicz, Elżbieta
Keywords: sintering; scheelites; magnetic properties; electrical properties; dielectric spectroscopy
Issue Date: 2021
Citation: "Materials" (2021), iss. 13, art. no. 3692, s. 1-15
Abstract: A series of Co2+-doped and Gd3+-co-doped calcium molybdato-tungstates, i.e., Ca1􀀀3x􀀀yCoy xGd2x(MoO4)1􀀀3x(WO4)3x (CCGMWO), where 0 < x 0.2, y = 0.02 and represents vacancy, were successfully synthesized by high-temperature solid-state reaction method. XRD studies and diffuse reflectance UV–vis spectral analysis confirmed the formation of single, tetragonal scheelite-type phases with space group I41/a and a direct optical band gap above 3.5 eV. Magnetic and electrical measurements showed insulating behavior with n-type residual electrical conductivity, an almost perfect paramagnetic state with weak short-range ferromagnetic interactions, as well as an increase of spin contribution to the magnetic moment and an increase in the power factor with increasing gadolinium ions in the sample. Broadband dielectric spectroscopy measurements and dielectric analysis in the frequency representation showed a relatively high value of dielectric permittivity at low frequencies, characteristic of a space charge polarization and small values of both permittivity and loss tangent at higher frequencies.
DOI: 10.3390/ma14133692
ISSN: 1996-1944
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