Search results for "Potassium chromate"
showing 3 items of 3 documents
Phase behaviour of Ag2CrO4 under compression: Structural, vibrational, and optical properties
2013
We have performed an experimental study of the crystal structure, lattice dynamics, and optical properties of silver chromate (Ag2CrO4) at ambient temperature and high pressures. In particular, the crystal structure, Raman-active phonons, and electronic band gap have been accurately determined. When the initial orthorhombic Pnma Ag2CrO4 structure (phase I) is compressed up to 4.5 GPa, a previously undetected phase (phase II) has been observed with a 0.95% volume collapse. The structure of phase II can be indexed to a similar orthorhombic cell as phase I, and the transition can be considered to be an isostructural transition. This collapse is mainly due to the drastic contraction of the a ax…
Tris(1,10-phenanthroline)zinc(II) dichromate tetrahydrate
2002
The title compound, [Zn(C12H8N2)3][Cr2O7]·4H2O, was obtained by mixing 1,10-phenanthroline (phen), potassium chromate and zinc sulfate solutions. The asymmetric unit is composed of a [Zn(phen)3]2+ cation, a Cr2O72− anion and four water molecules. The ZnII ion is in a distorted octahedral environment, coordinated by six N atoms from three phen molecules. The cations are connected to anions by weak C—H⋯O hydrogen bonds, with shortest H⋯O distances of ca 2.27–2.33 A. The Cr2O72− anion is in a staggered conformation. Two of the four crystallographically independent water molecules are ordered, and two others are disordered, each over two sites.
PLASMOGENY, A NEW SCIENCE OF THE ORIGIN OF LIFE
2014
The Church has always hampered the progress of Mankind so as to retain its hold over awareness, which is the basis of secular exploitation of the people.