Structure of barium copper pyrosilicate at 300 K

Abstract

Abstract. [NH3(CH3)]

An orthorhombic polymorph of naphthalene-2,3-dicarbonitrile

“…This situation is similar to that observed in (II) (Janczak & Kubiak, 2000). The remainder of the bonds, C1ÐC9, C4ÐC10, C5ÐC10, C6ÐC7 and C8ÐC9, have an intermediate length, ranging from 1.406 (3) to 1.418 (3) A Ê .…”

Structure of the cyclic barium copper silicate Ba2Cu2[Si4O12] at 300 K

“…The title compound is the second barium copper silicate obtained during our studies of the chemcial reactivity of the '1-2-3' type superconductors. Results on the synthesis and crystal structure of BaCu2Si207 which was obtained in the reaction of YBa2fu307-x with SiO2 in the presence of Bi203 have been published previously (Janczak, Kubiak & Gtowiak, 1989, 1990. The present work describes a structural investigation of the cyclic dibarium dicopper tetrasilicate, Ba2Cu2Si40~>…”

High-Pressure Raman Spectroscopy and X-ray Diffraction Study on Scottyite, BaCu2Si2O7

“…The chains are interlinked by the Si 2 O 7 dimers oriented parallel to the b-axis. [2,6,7] The largest bond distance of M-O was Ba-O (2.825 Å) where Ba 2+ cations are in the framework channels. The SiO 4 is a rigid body and is linked to the Si 2 O 7 dimer, so it is hard to compress.…”

“…As a newly found mineral, scottyite is a very rare mineral, first reported as an unnamed Ba-Cu silicate from Eifel, Germany [3][4][5]. It was then identified as an orthorhombic system with space group Pbnm and unit-cell parameters a = 6.866 Å, b = 13.901 Å, c = 6.902 Å, and V = 625.70 Å 3 [6]. It was later found in many other localities, including the Wessels mine, Kalahari Manganese Fields, Northern Cape Province, Republic of South Africa, from which the unit-cell parameters are determined as a = 6.8556 Å, b = 13.1725 Å, c = 6.8901 Å, and V = 622.21 Å 3 on the basis of a single-crystal XRD study [2].…”