Magnetic and Electrical Properties of CuCrSe Nanoparticles.

CuCrSe nanoparticles were obtained by the high-energy ball milling of CuCrSe single crystals, which had a size of approximately 32 nm after 5 h of milling. Structural, magnetic, and electrical studies have shown that a reduction in CuCrSe single crystals to the nanosize leads to (1) a weakening of ferromagnetic interactions, both long and short range, (2) a lack of saturation of magnetization at 5 K and 70 kOe, (3) a change in the nature of electrical conductivity from metallic to semiconductor, and (4) a reduction in the thermoelectric power factor Sσ by an order of magnitude of 400 K. The above results were considered in terms of the parameters of the band model, derived from the high-temperature expansion of magnetic susceptibility and from the diffusive component of thermoelectric power.

Magnetic and Electrical Characteristics of Nd and Mn-Co-doped Calcium Molybdato-Tungstates Single Crystals.

Single crystals of CaMn□Nd(MoO)(WO) molybdato-tungstates (□ denotes vacant sites) with a scheelite-type structure have been successfully grown by the Czochralski technique in an inert atmosphere. This paper presents the results of structural, optical, magnetic, and electrical properties, as well as the broadband dielectric spectroscopy measurements of single crystals with different Nd ion concentrations, , when = 0.0050 or = 0.

Magnetic and Electrical Properties of CoREWO Ceramic Materials.

Microcrystalline samples of CoREWO tungstates (RE = Y, Dy, Ho, Er) were prepared by a high-temperature solid-state reaction and then sintered into a ceramic form for unique properties and potential applications. For this purpose, structural, microscopic, ultraviolet-visible (UV-vis), magnetic, electrical, and thermoelectric measurements were performed. These studies showed a monoclinic structure, paramagnetism, short-range antiferromagnetic interactions in all samples, long-range ferrimagnetic interactions only in CoYWO, poor -type conductivity of 6.

Magnetic and Electrical Characteristics of Nd-Doped Lead Molybdato-Tungstate Single Crystals.

Single crystals of Pb▯Nd(MoO)(WO) (PNMWO) with scheelite-type structure, where ▯ denotes cationic vacancies, have been successfully grown by the Czochralski method in air and under 1 MPa. This paper presents the results of structural, optical, magnetic and electrical, as well as the broadband dielectric spectroscopy measurements of PNMWO single crystals. Research has shown that replacing diamagnetic Pb ions with paramagnetic Nd ones, with a content not exceeding 0.

Effect of Gd Substitution on Thermoelectric Power Factor of Paramagnetic Co-Doped Calcium Molybdato-Tungstates.

A series of Co-doped and Gd-co-doped calcium molybdato-tungstates, i.e., CaCoGd(MoO)(WO) (CCGMWO), where 0 < ≤ 0.