Showing papers in "European Journal of Solid State and Inorganic Chemistry in 1998"

TL;DR: In this article, the authors investigated the properties of various polymorphs of iron oxide hydroxide, viz. goethite (α), akaganeite (β), lepidocrocite (γ), and feroxyhite (δ), and discussed with respect to the crystal structures proposed in the literature.

TL;DR: In this article, it was shown that no hydroxylated hematite is formed during the early stages of the phase transformation of goethite, the presence of hydroxy ions in materials treated at high temperatures being explained by trapped water inside porous microstructure (TEM).

TL;DR: Mu-4 as discussed by the authors is a new layered aluminophosphate with a unusual A1/P ratio for this kind of materials, which was obtained from a quasi non-aqueous mixture involving mainly diethylformamide (DEF) as solvent, in addition to limited amounts of water.

TL;DR: In this paper, a pyroaurite compound, GR(C 2 O 4 2- ) Green Rust, was found to be paramagnetic at both temperatures and is unambiguously distinguished from the initial reactant, and magnetite, the main final product, which are magnetically ordered at 20 K.

TL;DR: The structure of monoaquabis(pyridine)bis(saccharinato)copper(II), [Cu(H 2 O)(py) 2 (sac) 2 ], has been investigated by X-ray diffraction and infrared spectroscopy as mentioned in this paper.

TL;DR: In this article, a chain-like zincophosphate was obtained at room temperature from a ZnO/P 2 O 5 /dimethylamine/H 2 O mixture.

TL;DR: In this article, it was shown that the FT-IR spectrum of copper acetylide prepared from ammonia solutions of Cu+ and Cu2+ ions is comparable to that of air oxidized Cu-C≡C-C-Cu (and Cu-c≡c-c-Cu) prepared exclusively from Cu+ ions in presence of a reducing agent.

TL;DR: In this paper, the main product from dicopper diacetylide is insoluble carbonaceous matter (23.47% by weight) together with diacetylene and its superior homologues (polyynes formed from solid state oxidative coupling reaction) which have been qualitatively and quantitatively identified by electronic spectroscopy.

TL;DR: In this article, a new gallophosphate was synthesized in aqueous medium using the macrocycle 1,4,8,11-tetraazacyclotetradecane as organic species.

TL;DR: The crystal structure determination of the title compounds showed that they are isomorphous, revealing the general formula [M(H2O)4(py)2 ]2+ cations, saccharinato anions and non-coordinated water molecules as discussed by the authors.

TL;DR: The T 1 and T 2 crystalline varieties of the ternary carbide Al 2 MgC 2 were synthesized by reacting graphite particles with Mg-Al melts at 930-1020 K Below 1000 K, the T 1 variety was predominant but little amounts of T 2 were also present At 1000 K and above, only the T 2 variety was obtained assuming a hexagonal close packing of the metal atoms as mentioned in this paper.

TL;DR: In this paper, two synthesis methods for preparing Pr 4 Ni 3 O 10±δ are compared : a modified sol-gel route and a nitrate-citrate one, and it is shown that the autoignition involved in the nitrate -citrate route provides good conditions ressembling the Rapid Thermal Annealing procedure.

TL;DR: In this article, the location of Eu3+ in alpha-cordierite, synthesized by a sol-gel route, was investigated by using both site-selective spectroscopy and time-resolved spectrum analysis.

TL;DR: In this article, the structure of Ba 2 ZrF 8 was determined from synchrotron powder data and the cell is orthorhombic, space group Prima, Z = 4, with a = 9.7401(1) A, b = 5.6147(1), A and c = 11.8871(1).

TL;DR: In this paper, a perovskite-like block structure was solved from single crystal X-ray diffraction data to a final R 1 = 0.0285, and the distortion of the cation and anion sublattices has been analyzed.

TL;DR: In this article, the stability domain and the crystallisation field of the compound were defined: an α-KY(WO 4 ) 2 crystal can grow if x Y 2O3 ≤ 0.175.

TL;DR: Li6P6O18 as mentioned in this paper is a cyclohexaphosphate anion with 1 internal symmetry and it crystallizes in a monoclinic cell with a = 7.9911(3), b = 17.0319(6)A, c = 5.3208(2), and β = 99.433°.

TL;DR: In this article, the electrical, optical and structural properties have been investigated as a function of various deposition parameters, namely dopant concentrations, temperature and nature of substrates, and X-ray diffraction patterns have shown that deposited films are polycrystalline without second phases and have preferred orientation.

TL;DR: In this paper, the ultraphosphates FeP4O11, ZnO6 octahedra (2.028(3), A < d FeO6 < 2.268(3) A), and ZnNO6-Octahedras ( 2.256(2) A) were synthesized from the corresponding meta- or polyphosphates.

TL;DR: β-SrRh2O4, a novel high temperature phase, is prepared as black powder by solid state reaction of SrCO3 with Rh in air as mentioned in this paper, which consists of Cd12-type layers of edge sharing RhO6 octahedra with an AABB oxygen layer sequence.

TL;DR: In this paper, two spray pyrolysis techniques, Electrostatic Spray Deposition (ESD) and Flame-Assisted Ultrasonic Spray Pyrolysis (FAUSP), are presented.

TL;DR: In this article, the subsolidus phase equilibrium in a Cu-Sb-O system was studied at high temperatures (over 500°C) and the system transforms in a quaternary one.

TL;DR: In this article, the transformation of Na 2 SO 4 -CaSO 4 melts down to room temperature results in different forms of metastable solid solutions dependent on the CaSO 4 content.

TL;DR: The structure of Bi 2 Te 2 O 7 was solved by analysis of single crystal X-ray data and refined on the basis of neutron powder diffraction data in this article, where the lattice parameters derived from a Guinier powder pattern (Si standard) were: a= 22.794 ± 0.005, b= 5.526 ± 1.001, c=22.065 ± 0.005A, z= 16.

TL;DR: In this paper, the structure of U 2 Te 3 was determined from single crystal X-ray diffraction data and refined to final residual factors R(F) = 0.030 and Rω(F)-Rω (F)= 0.035 for 32 variable parameters and a unique data set of 1100 diffraction intensities.

TL;DR: The K2.5Na2NH4[Mo2O2S2(cit)(2] 5H(2)O (1) was obtained by crystallization from a solution of (NH4)(2)MoS4, potassium citrate (K(3)cit) and hydroxyl sodium in methanol and water under an atmosphere of pure nitrogen at ambient temperature as mentioned in this paper.

TL;DR: In this paper, the chemical variability of semiconducting microporous materials with cetineite structure was determined based on the general formula A6[B12O18][CX3]2[Dx(H2O,OH,O)6−y], (0≤×≤2; 0≤y≤6), derived from X-ray crystal structure refinements.

TL;DR: In this article, the authors reported the study of manganese substituted barium fluoroapatite Ba10(P1−xMnxO4)6F2 with 0 ≤ × ≤ 0.20.

TL;DR: The structure of ZnLiNbO4 was determined by X-ray diffraction as mentioned in this paper, which is an ordered type of a tetragonal spinel with Nb and Li ions in octahedral environment and Zn ions in tetrahedral position.

TL;DR: In this article, a reaction mechanism for the calcining cycle of Pb(Fe1/2 Nb 1/2)O3 was proposed to obtain a pure perovskite phase from a 4PbO/Nb2O5/Fe2O3 mixture.