Zinc gallate and its starting materials in solid state reaction route- A comparative study

ZnGa2O4 belonging to the class of inorganic compounds with spinel structure is a self activated phosphor having wide applications in display devices. We report the synthesis and characterization of ZnGa2O4 using conventional solid state reaction method and a comparative study of its properties with commercial ZnO and Ga2O3 fired under similar conditions. XRD results proved that the zinc gallate phosphor is cubic in structure with an average grain size of 25 nm. Rectangular porous nature of zinc gallate phosphor is obtained from the SEM analysis. From the diffuse reflectance spectrum, the band gap of zinc gallate (4.74 eV) was evaluated to be between that of ZnO and Ga2O3. This ternary phosphor showed a bluish green emission with Commission International d'Eclairage (CIE) coordinates x = 0.26 and y = 036 under the excitation by UV light. (C) 2016 Elsevier B.V. All rights reserved

Highly conductive n- and p-type CuInO thin films by reactive evaporation

Undoped copper indium oxide films with conductivity three to four orders of magnitude higher than so far reported in this system, exhibiting both n- and p-type polarity are successfully prepared by reactive evaporation method. Hall coefficient and hot probe technique in conjunction with thermopower measurements ascertain the conductivity type of the films to be changing from n- to p-type, as the film composition assessed by energy dispersive analysis of X-rays changed from In rich to Cu rich. The conductivity is found to be similar to 2.1 x 10(1) S/cm in In-rich n-type films where as it is similar to 1.13 x 10(2) S/cm in Cu-rich p-type films with a corresponding increase in carrier concentration and carrier mobility in the latter. Scanning electron micrographs show close assembling of nanograins and X-ray diffraction reveals a change in orientation of crystallites from (006) to (600) as the composition goes from In rich to Cu rich. (C) 2014 Elsevier B.V. All rights reserved

Multi-scale hybrid eco-nanocomposites: synthesis and characterization of nano-SiC-reinforced vinyl-ester eco-composites

Polymer eco-nanocomposites based on vinyl-ester, recycled cellulose fibre and nano-silicon carbide (n-SiC) have been synthesized and characterized in terms of porosity, water-absorption behaviour, thermal and mechanical properties. The addition of n-SiC led to reduced porosity and water uptake because of enhanced fibre–matrix adhesion which permitted efficient load transfer and thus strength improvement. However, n-SiC addition reduced the prevalence of fibre debonding and pull-outs, thus causing sample brittleness and inferior fracture toughness. In terms of thermal properties, n-SiC addition facilitated improved mass transport and heat barriers, thus improving thermal stability and fire resistance

and influence of egg density on early veliger larvae and effects of dietary microalgae on growth of brown mussel Perna perna (L. 1758) larvae under laboratory conditions

Publicado