Pressure dependence of the structure and electronic properties of Sr3Ir2O7 General rights Copyright for the publications made accessible via the Edinburgh Research Explorer is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The U...

Ca2-xPrxMnO4 (x = 0.000 to 0.200) manganites were synthesized by a sol-gel method and then characterized by X-ray diffraction (XRD) at room temperature. Rietveld refinement technique shows that all samples can be indexed in orthorhombic system except for Ca2MnO4 (x = 0.000) which can be indexed in the tetragonal system. Magnetic and electrical measurements show that magnetization and resistivit...

There is ongoing effort to identify novel materials that have performance better than LiCoO2. The objective of this work is to explore materials in the system (1 – x – y) LiNi0.8Co0.2O2 • xLi2MnO3 • yLiCoO2. A ternary composition diagram was used to identify sample points, and compositions for testing were initially chosen. Detailed characterization of the synthesized materials was done, includ...

Herein we report on the synthesis of a new layered ternary carbide, viz. Mo2TiAlC2, that was synthesized by heating an elemental mixture at 1600 oC for 4 h under Ar flow. Its lattice parameters were calculated via Rietveld analysis of powder Xray diffraction patterns to be 2.997 Å and 18.661 Å. High-resolution scanning transmission electron microscopy further showed that this phase is ordered, ...

A nearly single-phase of a low-temperature (LT) phase of Li(2)FeSiO(4) is prepared by a hydrothermal method at 150 °C. We report the detailed crystal structure of LT-Li(2)FeSiO(4) (S.G. Pmn2(1)) by applying Rietveld/MEM analysis to the synchrotron XRD pattern. LT-Li(2)FeSiO(4) shows 150 mA h g(-1) as the positive electrode materials of rechargeable batteries.

Ranjan et al. @Phys. Rev. B 65, 060102~R! ~2002!# have recently presented results of a powder neutrondiffraction study of the high-temperature monoclinic (FM ) to low-temperature monoclinic (FM ) phase transition in Pb(Ti12xZrx)O3 discovered by Ragini et al. @Phys. Rev. B 64, 054101 ~2001!#. They attribute the presence of superlattice reflections in the diffraction data to tilting of oxygen oct...

A new structure motif in nitridometalate chemistry is the tetracatena-nitridotantalate anion [Ta4N13]19-. It occurs in the crystal structure of the triple salt Sr14[Ta4N13][TaN4]O (monoclinic, space group P21/c with a = 15.062(2) Å, b = 7.2484(6) Å, c = 24.266(3) Å, and β = 97.280(10)o) together with ortho-tantalate and isolated oxide anions. Synthesis followed a new approach with employment of...

Kinetic in situ neutron diffraction has been used to study the crystallization of amorphous Y67Fe33. The results show that partial crystallization first occurs close to 300 ◦C where the Y phase is formed. The entire sample crystallizes at 390 ◦C and new Bragg peaks appear, signifying the formation of a novel Y–Fe phase. This new phase coexists with Y to 450 ◦C when the Bragg peaks associated wi...

Calcium barium sulphoaluminate (CBSA), derived from calcium sulphoaluminate (CSA), has excellent cementitious properties. In this study, the sintering system of CBSA with a theoretical stoichiometric Ca3BaAl6SO16 was investigated. Rietveld refinement was performed using TOPAS 4.2 software to quantitatively calculate the content of CBSA and the actual ionic site occupancy of Ba2+. The results in...

The structure of marialite (Me6) from Badakhshan, Afghanistan and meionite (Me93) from Mt. Vesuvius, Italy was obtained using synchrotron high-resolution powder X-ray diffraction (HRPXRD) data and Rietveld structure refinements. Their structure was refined in space groups I4/m and P42/n, and similar results were obtained. The Me6 sample has a formula Ca0.24Na3.37K0.24[Al3.16Si8.84O24]Cl0.84(CO3...