Materials Literature
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Recently, rare earth doped vanadates have been identified as potential successor to YAG crystals. Not much is known about the ionising radiation effect on the lasing and other properties of vanadates. Colour centres, defects, etc. formation by γ-ray irradiation in pure and Yb3+ doped YVO4, studied by thermoluminescenc…
Morphology and other characteristics of six typical pedons formed on sandstone, shale, granite and colluvium representing different landforms of Banda district of Uttar Pradesh were studied. The soils are deep to very deep, excessively to well drained, reddish brown to red, mildly acidic, low to medium in CEC, medium…
Two kinds of nano-TiO2 samples, including nano-anatase and nano-rutile, were prepared by the hydrothermal method and the gas condensation method, respectively. Results of dielectric measurements are as follows: 1. Nano-TiO2 bulk samples (anatase and rutile) exhibit much higher dielectric constant than coarse-grain sam…
Core-level shifts and core-hole screening effects in alloy formation are studied ``ab initio'' by constrained-density-functional total-energy calculations. For our case study, the ordered intermetallic alloy MgAu, final-state effects are essential to account for the experimental Mg 1s shift, while they are negligible…
The study of the Na0.5Bi0.5TiO3–K0.5Bio0.5TiO3 (NBT-KBT) system was carried out using X-ray diffraction and dielectric measurements. The limits of rhombohedral and orthorhombic solid solutions were determined, as well as the evolution of their lattice parameters as a function of composition and temperature. Dielectric…
Spectral sensitivity is an important consideration in photoconductor formulation, depending on the particular type of electrophotographic device in which the photoconductor is to be used. High sensitivity in both the near-IR and visible spectral regions would be desirable for a photoconductor used with a wide variety…
A precise method is presented for measuring the refractive index of an anisotropic prism with light polarized orthogonal to the prism axis which is also a dielectric axis. Prisms have been cut from crystals of the optically nonlinear 4-amino benzophenone with exceptionally low defect concentration as identified by syn…
This paper emphasizes the complementarity between optical and magneto-optical measurements on f elements. The magnetic circular dichroism, circular dichroism, and polarized absorption spectra of Na3Nd(ODA)3⋅2NaClO4⋅6H2O (NdODA), have been recorded at 4.2 K between 5000 and 30 000 cm−1. The electric dipole contribution…
In the previous article we introduced a method to obtain an ensemble density describing a molecule in a crystal from diffraction experiment structure factors. Here the method is applied to the CoCl42− molecular ion in a Cs3CoCl5 crystal for which accurate magnetic structure factors are known. First, the approximations…
Latex drying behaviour and (film) properties as minimum film forming temperature (MFT), dynamic mechanical behaviour, hardness and tensile strength have been compared, for latices prepared according to two stage emulsion polymerisation and by blending low and high Tg single stage latices. Compared to single stage coun…
We have carried out ac-conductivity \ensuremath{\sigma}(\ensuremath{\omega}) measurements on ${\mathrm{La}}_{2}$${\mathrm{NiO}}_{4+\mathrm{\ensuremath{\delta}}}$,0\ensuremath{\leqslant}0.08, in the frequency (\ensuremath{\omega}) and temperature ranges 5 Hz--13 MHz and 75--300 K. The ac conductivity follows a set of b…
A chiral smectic liquid crystal is considered, made of elongated molecules whose directions describe a helix along a given direction. It is shown that for small values of the helix pitch it behaves as a homogeneous medium which is optically active and uniaxial, with maximum rotatory power for light propagating orthogo…
The low-temperature dc conductivity and magnetoconductivity of ion-implanted (${\mathrm{Ar}}^{+}$) and chemically doped (${\mathrm{H}}_{2}$${\mathrm{SO}}_{4}$) polyaniline films have been studied. The metal-insulator transition has been observed for ion-implanted polyaniline films on increasing the irradiation dose to…
We have analyzed the ab initio local-density-approximation band-structure calculations for the family of perovskite oxides, LaM${\mathrm{O}}_{3}$ with M=Ti--Ni within a parametrized nearest-neighbor tight-binding model, and extracted various interaction strengths. We study the systematics in these interaction paramete…
The interionic solution structures of trans -[Ru(PMe 3 ) 2 (CO)(COMe)(pz 2 -CH 2 )]BPh 4 and trans -[Ru(PMe 3 ) 2 (CO)(COMe)(η 2 -pz 3 -CH)]BPh 4 have been “directly” investigated by the detection of interionic contacts in 1 H-NOESY NMR spectra between the protons of the organometallic fragments and those of the count…
Photoabsorption spectra of isolated ${\mathrm{Ga}}_{\mathit{N}}$${\mathrm{As}}_{\mathit{M}}$ clusters (N+M=4--80) have been investigated in the range \ensuremath{\Elzxh}\ensuremath{\omega}=1.7--6.4 eV by measuring their absolute photodissociation and photoionization cross sections. The results are analyzed in terms of…
The absorption coefficient of CuGe${\mathrm{O}}_{3}$ was measured in the energy range of 1-4 eV, in a temperature interval between 300 and 20 K, for light polarized along the $b$ and $c$ crystal axes. A weak absorption band at 1.7 eV is attributed to copper $d\ensuremath{-}d$ transitions partially allowed by electron-…
The mean escape depth (MED) of the signal photoelectrons in x-ray photoelectron spectroscopy (XPS) is a useful measure of the surface sensitivity in XPS measurements. The MED has previously been given by the product of the inelastic mean free path for the signal electrons and the cosine of the photoelectron emission a…
An ac calorimetric method is applied to the direct measurement of thermal diffusivity of single fibers. Theoretical analysis is presented, taking into account the two-dimensional ac thermal wave for cylindrical systems and the effect of time delay at the temperature detecting system. Experimental tests are performed u…
The influence of magnetic ordering on the NiO valence band has been studied by angle resolved photoelectron spectroscopy. Measurements have been performed at temperatures above and below the N\'eel temperature (${\mathit{T}}_{\mathit{N}}$), as well as at room temperature. The results show temperature dependence but no…