CuIn2n+1S3n+2 crystals were synthesized by horizontal Bridgman method using high purity copper, indium, sulfur elements. The phases and crystallographic structure of the CuIn2n+1S3n+2 crystals were analyzed by X-ray diffraction (XRD) and the composition of the material powders was determined using the energy dispersive X-ray analysis (EDX). Measurement data revealed that CuIn2n+1S3n+2 materials...

Keywords: Cobalt ferrite Gd-substitution Raman spectroscopy Magnetic properties Neel temperature a b s t r a c t Polycrystalline gadolinium (Gd) substituted cobalt ferrites (CoFe 2Àx Gd x O 4 ; x = 0–0.3, referred to CFGO) ceramics have been synthesized by solid state reaction method. Chemical bonding, crystal structure and magnetic properties of CFGO compounds have been evaluated as a function...

A new form of LiMn2O4 is reported. The structure is the CaFe2O4-type and 6% denser than the spinel. The structure transformation was achieved by heating at 6 GPa. Analysis of the neutron diffraction pattern confirmed an average of the structure; the unit cell was orthorhombic at a = 8.8336(5) angstroms, b = 2.83387(18) angstroms, and c = 10.6535(7) angstroms (Pnma). Electron diffraction pattern...

With a new type of ion microprobe, the NanoSIMS, we determined the oxygen isotopic compositions of small ( 1 m) oxide grains in chemical separates from two CM2 carbonaceous meteorites, Murray and Murchison. Among 628 grains from Murray separate CF (mean diameter 0.15 m) we discovered 15 presolar spinel and 3 presolar corundum grains, among 753 grains from Murray separate CG (mean diameter 0.45 ...

0921-8831/$ see front matter 2011 The Society of doi:10.1016/j.apt.2011.11.004 ⇑ Corresponding author. Address: School of Metallu ing, University of Tehran, P.O. Box 14395-1491, Tehran fax: +98 21 88006076. E-mail address: [email protected] (S. Sheibani). In this paper, the possibility of mechano-chemical synthesis, as a single step process for preparation of nanostructured nickel aluminate sp...

~5 nm! Cr/(x nm) MgO/Mn0.52Zn0.48Fe2O4 ~MnZn spinel! substrate (1,x,7 nm), as well as ~5 nm! Cr/~7 nm! MgO/glass substrate structures have been grown using molecular beam epitaxy. The influence of the MnZn spinel on the in-plane transport and magnetotransport properties of the Cr layer were studied. The existence of pinholes in the MgO layer was explored by evaluating resistance versus temperat...

This article summarizes core aspects of beam-sample interactions in research that aims at exploiting the ability to detect single atoms at atomic resolution by mid-voltage transmission electron microscopy. Investigating the atomic structure of catalytic Co3O4 nanocrystals underscores how indispensable it is to rigorously control electron dose rates and total doses to understand native material ...