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Title: Electrical and optical properties of new Pr3+-doped PbWO4 ceramics
Authors: Groń, Tadeusz
Piątkowska, Magdalena
Tomaszewicz, Elżbieta
Sawicki, Bogdan
Urbanowicz, Piotr
Duda, Henryk
Keywords: scheelite-type structure; thermoelectric power; optical properties; electrical conductivity
Issue Date: 2018
Citation: Materials Science- Poland, Vol. 36, iss. 4 (2018), s. 530-536
Abstract: Polycrystalline samples of new scheelite-type tungstates, Pb1 􀀀 3x xPr2xWO4 with 0.0098 6 x 6 0.20, where denotes cationic vacancies have been successfully prepared by a high-temperature solid-state reaction method using Pr2(WO4)3 and PbWO4 as the starting reactants. The influence of the Pr3+ substitution in the scheelite framework on the structure and optical properties of prepared new ceramic materials has been examined using powder X-ray diffraction method (XRD) and UV-Vis-NIR spectroscopy. The results of dielectric studies of Pb1 􀀀 3x xPr2xWO4 samples showed both low values of dielectric constant (below 14) and loss tangent (below 0.2). The electrical conductivity and thermoelectric power measurements revealed a low conductivity ( 2 × 10􀀀9 S/m) and the sign change of thermoelectric power around the temperature of 366 K suggesting the p-n transition. These results are discussed in the context of vacancy, acceptor and donor levels as well as the Maxwell-Wagner model.
DOI: 10.2478/msp-2018-0080
ISSN: 2083-134X
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