Free-standing powder of zinc sulphide quantum particles has been synthesized using a chemical route. X-ray diffraction analysis shows that the diameter is ∼21±2 Å which smaller than Bohr exciton for sulphide. UV absorption an excitonic peak centered at ∼300 nm corresponding to energy gap 4.1±0.1 eV. These show luminescence band ∼424 nm. The could be doped with copper during synthesis without altering or x-ray pattern. However, doping shifted 480 nm, green wavelength in visible region.

In this communication, we report the preparation and properties of nano-CoFe2O4 by gel combustion in presence KCl subsequent heat treatments. The products were characterized X-ray diffraction, Infrared spectroscopy, Mössbauer Spectroscopy. Spinel type structure with all Fe 3+ oxidation states was confirmed from XRD Mossbauer spectroscopy. average crystallite sizes studied samples about 6 50 nm. Low temperature magnetic dielectric superconducting quantum interference device magnetometry...

In this work a Mn doped magnetoelectric BiFeO3 system is studied. X-ray diffraction (XRD), scanning electron microscopy, energy dispersive x-ray analysis (EDX), Mössbauer spectroscopy at room and high temperatures, differential calorimetry (DSC), temperature magnetization, dielectric constant measurements photoelectron (XPS) are used to characterize the samples. The XRD result shows as major phase along with about 1–2% impurity phase. EDX equi-atomic ratio of Bi Fe site cations. Using DSC it...

In this communication we report the details of structural and thermal properties monoclinic layered perovskite type Pr₂Ti₂O₇ (PTO) using ambient to higher temperature XRD Raman spectroscopic studies.

Abstract A series of hexagonal perovskite derivative compounds Ba 3 W 1+ x V 1− O 8.5+ /2 ( = − 0.2, 0.1, 0, 0.2) with varying oxygen content was synthesized by high-temperature solid-state reaction route and characterized using X-ray diffraction, SEM–EDX, Raman spectroscopy, XPS, dielectric spectroscopy. All samples were isostructural, having features both palmierite 9R perovskite. The unit cell volume showed a continuously decreasing trend increasing content. XPS studies no deviation...

Nanocrystalline phase pure CeCrO3 was synthesized by a two-step synthesis. The compound investigated host of characterization techniques such as X-ray diffraction, high-temperature high-resolution transmission electron microscopy, photoelectron spectroscopy, thermogravimetric−differential thermal analysis, magnetic and specific heat capacity data, ac impedance diffuse reflectance DR UV−visible spectrophotometer, dynamic light scattering. structure established using variable-temperature...

Sensing characteristics of the drop-cast thin films poly(3-hexylthiophene) (P3HT), ZnO nanowires, and P3HT:ZnO-nanowire hybrids with different compositions have been studied for various gases, namely, NO2, H2S, NH3, CH4, CO. At room temperature, pure P3HT ZnO-nanowire were highly sensitive to NO2 moderately CO, nearly insensitive NH3 CH4. hybrid films, increasing content, exhibited gradual enhancement in sensitivity, while reducing sensitivity H2S. (1:1 ratio by weight) found be selective...

Detailed structural and electrical investigations were carried out on a GdSc1–xInxO3 (0.0 ≤ x 1.0) series. The solubility of In3+ in GdScO3 could be increased by 20 mol % changing the synthesis route. GdScO3, technologically important dielectric material, synthesized at temperature as low 850 °C. An orthorhombic modification GdInO3 stabilized Sc3+ substitution, which is otherwise known to prefer hexagonal polymorphs. Nonpreference trigonal bipyramidal coordination led existence very narrow...

Low-temperature dielectric measurements on FeTi$M$O${}_{6}$ (M = Ta,Nb,Sb) rutile-type oxides at frequencies from 0.1 Hz to 10 MHz revealed anomalous relaxations with frequency dispersion. Unlike the high-temperature relaxor response of these materials, low-temperature are polaronic in nature. The relationship between and temperature loss peak follows T${}^{\ensuremath{-}1/4}$ behavior. dependence ac conductivity shows well-known universal response, while dc Mott variable range hopping (VRH)...

The influence of Ar+ implantation induced disordering in the surface layers CR-39 polymer on its optical properties and hardness has been studied. specimens were implanted at 130 keV to doses 5 × 1014, 1 1015, 1016 cm−2. structural behavior pre- postimplanted was investigated using UV-Visible, Raman, x-ray diffraction techniques. Formation disordered graphitelike structures polycarbonate observed Raman UV-Visible spectroscopy. A significant increase value disorder content (Urbach energy)...

Poly(ethylene oxide), PEO, based solid polymer electrolyte with different loadings of a lithium salt, bis(trifluoromethanesulfonyl)imide (LiTFSI), has been investigated to study the role PEO–Li cross-linking on segmental dynamics and free volume structure PEO which consequently determine thermal, mechanical, ion conduction properties electrolyte. In order investigate interrelation between dynamics, structure, mechanism, broadband dielectric spectroscopy positron annihilation have employed....

The effect of nitrogen ion implantation has been examined in transparent surfaces CR-39 polymer. Samples were implanted with 100keV N+ ions to various doses ranging from 1014to1017cm−2. chemical and structural changes the specimens performed using Raman spectroscopy glancing angle x-ray diffraction. Ultraviolet-visible absorption analysis indicates a drastic decline optical band gap 3.50eV virgin sample 0.80eV at an dose 1017ionscm−2.

High-temperature relaxor ferroelectric behavior (Tm ∼ 550 K) is reported for the rutile-based oxide, FeTiTaO6. Our investigations of structure and dielectric properties MTiTaO6 (M = Al, Cr, Fe) have revealed that all oxides possess disordered rutile but only iron member shows a strong effect. The new material lead-free it based on structure, unlike conventional relaxors which are mostly derived from perovskite structure.

In this communication, we report details of structural, magnetic, and dielectric properties multiferroic Bi7Fe3Ti3O21 at cryogenic temperatures. The low temperature impedance spectroscopic studies showed a relaxor-like anomaly which follows Vogel-Fulcher relation with freezing (TVF) 33 K. Temperature field dependent magnetization indicate the onset possible antiferromagnetic ordering below 150 Variable powder neutron diffraction no structural change down to 22 appearance along evidence...