Dielectric and electrical properties of Sr₅EuCr₃Nb₇O₃₀ nanoceramics prepared using a novel chemical route

Abstract

Polycrystalline samples of Sr 5 EuCr 3 Nb 7 O 30 , a member of the tungsten bronze (TB) family, have been prepared by a novel chemical precursor route with a chemical dispersion and mixing of the metal cations in an acidic solution. Preliminary structural studies have been carried out using X-ray diffraction of samples heated at different temperatures, in the 973 to 1173 K range, from the precursor. They confirm the formation of the single-phase compound in an orthorhombic structure at room temperature. The dielectric constant (ε) and tangent loss (tan δ) of the samples have been measured as a function of both frequency (10 2 -10 5 kHz) and temperature (300 -700 K). None of the samples shows any dielectric anomaly. Impedance spectroscopic data are explored to gain an insight into the electrical properties and the relaxation behaviors. The measurement of the conductivity as a function of temperature suggests that the samples have a negative temperature coefficient of resistivity in a typical semiconductor behavior.

Synthesis and Electrical Analysis of Ba<sub>5</sub>GdTi<sub>3</sub>V<sub>7</sub>O<sub>30</sub> Ceramics

“…The unit cell parameters are consistent, and are in good agreement, with those reported earlier [9,16,17] for TB structural family. Unfortunately, it is not possible to determine the space group of the compound with the limited powder data.…”

“…Nowadays, the research of lead-free electroceramics and their applications are extremely important as a result of implementing the strategy for the sustainable development of the world, and strengthening to the consciousness of environmental protection. Detailed literature survey shows that though a lot of work has been done on TB structured compounds [9][10][11][12][13][14]. In view of the importance of the eco-friendly (lead-free) materials of the above family, we have recently carried out the systematic structural and electrical studies of the Ba 5 GdTi 3 V 7 O 30 compound.…”

Magnetic transport behavior of nano-crystalline Pr0.67A0.33MnO3 (A = Ca, Sr, Pb and Ba) manganites

“…In recent studies, poly vinyl alcohol (PVA)-gel route was developed for manganites [5], porous silica films [6], photoluminescence materials [7], etc. The PVA-gel route is simple and convenient in preparing nano-size poly crystalline materials.…”

Doping effect of SrZrO3 on KNLN ceramics structure and their dielectric properties

“…Furthermore, with the temperature increase, molecules are expected to be expanded causing some increase in the electronic polarization and hence an increase in both " 0 and " 00 of the dielectric material. [26][27][28][29][30] The increase of the electrical conductivity at high temperature is attributed to the impurities, which is located at the grain boundaries. 26,29 These impurities lie below the bottom of the conduction band.…”