7783-53-1Relevant articles and documents
Synthesis and structure of a tetragonal fluoroperovskitevariety deficient in cations - Cs4PdMn2F12
Fischer,Mller
, p. 1532 - 1536 (2008/10/08)
Single crystals of red Cs4PdMn2F12 were obtained by systematic investigations in the system CsF/MnF3/Pd/PdF3. The Compound crystallizes with a = b = 856.89(6) pm, c = 1918.35(18) pm, spcgr. I 41/amd - D4h19 (No. 141) and Z = 4. It is structurally related to K4MnMn2F12, but with square arrangement (isotypic?) of F- around Pd2+.
Structural and magnetochemical studies of Ba5Mn3F19 and related compounds AII5MIII3F19
Dahlke,Graulich,Welsch,Pebler,Babel
, p. 1255 - 1263 (2008/10/08)
Single crystal structure determinations by X-ray methods were performed at the following compounds, crystallizing tetragonally body-centred (Z = 4): Sr5V3F19 (a = 1423.4(2), c = 728.9(1) pm), Sr5Cr3F19 (a = 1423.5(2), c = 728.1(1) pm), Ba5Mn3F19 (a =1468.9(1), c =770.3(1) pm, Ba5Fe3F19 (a =1483.5(1), c =766.7 (1) pm), and Ba5Ga3F19 (a = 1466.0(2), c = 760.1(2) pm). Only Ba5Mn3F19 was refined in space group I4cm (mean distances for elongated octahedra Mn1-F: 185/207pm equatorial/axial; for compressed octahedra Mn2-F: 199/182 pm), the remaining compounds in space group I4/m. In all cases the octahedral ligand spheres of the M1 atoms showed disorder, the [M1F6] octahedra being connected into chains in one part of the compounds and into dimers in the other. The magnetic properties of the V, Cr and Mn compounds named above and of Pb5Mn3F19 and Sr5Fe3F19 as well were studied; the results are discussed in context with the in part problematic structures.
Saturated vapor pressure and enthalpy of sublimation of manganese di- and trifluorides
Rau,Chilingarov,Leskiv,Nikitin,Sidorov,Petrov,Sukhoverkhov,Orekhov
, p. 349 - 353 (2007/10/03)
The Knudsen effusion method with a mass spectrometric analysis of the gas phase was used to study vaporization of manganese di- and trifluorides. Saturated vapor pressures and the enthalpies of sublimation, Δ8H°(MnF2, 0 K) = 295 ± 11 kJ/mol and ΔsH°(MnF3, 0 K) = 267 ± 15 kJ/mol, were determined.
Thermal Decomposition and Pyrohydrolysis of Manganese Tetrafluoride
Rakov,Khaustov,Pomadchin
, p. 1646 - 1649 (2008/10/08)
Thermal decomposition of MnF4 and its reaction with water vapor are studied by gravimetric, DTA, and TG analyses complemented by chemical and X-ray diffraction analyses of the solid products. The decomposition is found to begin at temperatures higher than 325 K and to proceed with the formation of MnF3 and partial evolution of MnF4. At temperatures below 473 K, the reaction does not reach completion because of kinetic hindrance. Pyrohydrolysis of MnF4 is accompanied by reduction and proceeds stepwise to form first MnF3 · 3H2O and then MnOF.
Kinetics of Fluorination of Manganese Compounds with Fluorine Gas
Rakov,Ostropikov,Khaustov
, p. 149 - 153 (2008/10/08)
The kinetics of fluorination of MnO2, MnF2, and KMnF3 powders by fluorine in nitrogen carrier gas at atmospheric pressure was studied by gravimetry. The kinetic equations of fluorination were deduced. MnO2 converts to MnF3 markedly more rapidly than MnF2. The volatile product (MnF4) forms above 780 K.
Enthalpies of Formation of Manganese Di- and Trifluorides
Nikitin, M. I.,Rakov, E. G.,Tsirel'nikov, V. I.,Khaustov, S. V.
, p. 1039 - 1042 (2008/10/08)
Temperature dependence of saturation vapor pressures of MnF2 and MnF3 and equilibrium constants for the reaction MnF2(k) + UF6(g) = MnF3(k) + UF5(g) are determined by the effusion method combined with mass spectrometry analysis of the gas phase. Enthalpies of sublimation of MnF2 and MnF3and the enthalpy of the reaction are calculated by the third law to be 295.5+-0.3, 266.8+-0.4, and 33.9+-0.4 kJ/mol, respectively, at 0 K. Base d on the results obtained and data in the literature, the enthalpies of formation of gaseous MnF2 and MnF3, and crystalline MnF3 at 0 K are taken to be -558.7+-5.0, -784.5+-6.0, and -1048.8+-6.0 kJ/mol, respectively.
