THE ALUMINUM REDUCTION OF MAGNESIUM OXIDE: I. THE VAPOR PRESSURE OF MAGNESIUM OVER THE SYSTEM Al–MgO

1961 ◽  
Vol 39 (3) ◽  
pp. 443-450 ◽  
Author(s):  
K. Grjotheim ◽  
O. Herstad ◽  
J. M. Toguri
Keyword(s):  
Vapor Pressure ◽  
Diffraction Analysis ◽  
Magnesium Oxide ◽  
Log P ◽  
X Ray Diffraction ◽  
Aluminum Reduction ◽  
X Ray ◽  
Temperature Range ◽  
Reaction Proceeds ◽  
Equilibrium Vapor Pressure

The equilibrium vapor pressure of magnesium over the reaction between magnesium oxide and aluminum was measured by means of the transportation method. In the temperature range 850–1150 °C the results can be expressed by the equation log Pmm of Hg = −9617/T + 8.93. From X-ray diffraction analysis this reaction proceeds according to the equilibrium[Formula: see text]

THE ALUMINUM REDUCTION OF MAGNESIUM OXIDE: II. THE VAPOR PRESSURE OF MAGNESIUM OVER THE SYSTEM Al–MgO–CaO

1961 ◽  
Vol 39 (11) ◽  
pp. 2290-2294 ◽  
Author(s):  
K. Grjotheim ◽  
O. Herstad ◽  
J. M. Toguri
Keyword(s):  
Vapor Pressure ◽  
Magnesium Oxide ◽  
Equilibrium Pressure ◽  
Aluminum Reduction ◽  
Temperature Range ◽  
Equilibrium Vapor Pressure

The equilibrium vapor pressure of magnesium over the reaction between the calcined dolomite and aluminum was measured by means of the transportation method. In the temperature range 886–1035 °C, the reaction was found to proceed according to the equilibrium[Formula: see text]and the measured equilibrium pressure of magnesium can be expressed by the equation[Formula: see text]

Powder X-ray diffraction analysis of the ferroelectric liquid crystal with a 2-methylbutoxypropionate unit as a function of temperature

2003 ◽  
Vol 18 (4) ◽  
pp. 293-295 ◽  
Author(s):  
L. Dobiášová ◽  
H. Šíchová ◽  
V. Valvoda
Keyword(s):  
Liquid Crystal ◽  
Diffraction Analysis ◽  
Small Variation ◽  
Ferroelectric Liquid Crystal ◽  
X Ray Diffraction ◽  
Layer Spacing ◽  
X Ray ◽  
Temperature Range ◽  
Liquid Crystal Material ◽  
Intermolecular Distances

The ferroelectric liquid crystal material [4-[(4-methyloxyfenyl) carbonyloxyl] bifenyl-4′-yl]-(S)-2-methylbutoxypropionate containing a lateral methyl group on the aromatic ring of the alkoxybenzoate unit and two chiral carbons has been investigated by X-ray powder diffraction analysis at the 28 °C–105 °C temperature range. On cooling through the SmC temperature range, the layer spacing decreases from 28.3 to 27.7 Å with a small variation of average intermolecular distances. Lattice parameters of tetragonal and monoclinic crystalline phases occurring at lower temperatures have been determined.

scholarly journals Структурные особенности замещенного феррита стронция Sr-=SUB=-1-x-=/SUB=-La-=SUB=-x-=/SUB=-FeO-=SUB=-3-delta-=/SUB=-: I. Sr-=SUB=-2-=/SUB=-LaFe-=SUB=-3-=/SUB=-O-=SUB=-9-delta-=/SUB=-

2021 ◽  
Vol 63 (10) ◽  
pp. 1648
Author(s):  
В.Д. Седых ◽  
О.Г. Рыбченко ◽  
Н.В. Барковский ◽  
А.И. Иванов ◽  
В.И. Кулаков
Keyword(s):  
Heat Treatment ◽  
Diffraction Analysis ◽  
Rhombohedral Phase ◽  
Structural Features ◽  
Structure Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Treatment Conditions ◽  
Valence States

The structural features and Fe valence states in the substituted strontium ferrite Sr2/3La1/3FeO3-δ (or Sr2LaFe3O9-δ) have been studied for different synthesis and heat treatment conditions by X-ray diffraction analysis and Mossbauer spectroscopy. A series of annealing of Sr2LaFe3O9-δ in vacuum ((10-3 Torr) in the temperature range of 400 - 650оС allowed us to trace the structure evolution from rhombohedral phase (Sr2LaFe3O9) to orthorhombic one (Sr2LaFe3O8) over the formation of intermediate multiphase states and the redistribution of Fe valence states as well.

scholarly journals Chemical reactions in the preparation of B4C-CeO2 composites

2020 ◽  
Vol 185 ◽  
pp. 04056
Author(s):  
Junsuo Li ◽  
Zhongqi Dong ◽  
Kewu Pen
Keyword(s):  
Diffraction Analysis ◽  
Chemical Reactions ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Infiltration Method

The B4C-CeO2 composites were prepared by pressure-free infiltration method. The chemical reactions and products of CeO2 and B4C in the temperature range of 20~1500 were studied by TG-DTA and X-ray diffraction analysis. The results show that the B4C and CeO2 reaction products are CeB4, B, CeBO3 in 550~1240 and the product of CeO2 reaction with B4C is CeB6 in the temperature range of 1240~1300℃.

The Solid State Displacement Reaction CsCl + Nal → Csl + NaCl

1977 ◽  
Vol 32 (5) ◽  
pp. 511-512 ◽  
Author(s):  
Vincenzo Massarotti ◽  
Giorgio Flor ◽  
Riccardo Riccardi
Keyword(s):  
Solid State ◽  
Diffraction Analysis ◽  
Divalent Cation ◽  
Solid State Reaction ◽  
Displacement Reaction ◽  
Diffusion Couples ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Rate Determining Step

Abstract The solid state reaction CsCl+Nal → CsI+NaCl was investigated, employing diffusion couples with two different contents of divalent cation impurities, in the temperature range 350-419 °C. From kinetic determinations, inert marker experiments and X-ray diffraction analysis it was possible to deduce that the rate − determining step is the diffusion of I- in CsI via VI.

THE ALUMINUM REDUCTION OF MAGNESIUM COMPOUNDS: III. THE VAPOR PRESSURE OF MAGNESIUM OVER THE SYSTEM Al–Mg2SiO4 (OLIVINE)

1963 ◽  
Vol 41 (3) ◽  
pp. 739-742 ◽  
Author(s):  
K. Grjotheim ◽  
O. Herstad ◽  
R. Skarbö ◽  
J. M. Toguri
Keyword(s):  
Phase Diagram ◽  
Vapor Pressure ◽  
Liquidus Line ◽  
Unstable System ◽  
Equilibrium System ◽  
Aluminum Reduction ◽  
Temperature Range ◽  
Magnesium Compounds ◽  
Aluminum Activity ◽  
Equilibrium Vapor Pressure

The equilibrium vapor pressure of magnesium over the reaction between olivine (Mg2SiO4) and aluminum was measured by means of the transportation method in the temperature range 943–1150 °C.It was concluded that olivine and aluminum form an unstable system which reacts completely according to the equation[Formula: see text]However, in the presence of excess aluminum, an Al–Si alloy results. This alloy in turn reacts with magnesium oxide according to the equilibrium[Formula: see text]The vapor pressure of magnesium over this equilibrium system was found to obey the equation[Formula: see text]The aluminum activity of the Al–Si alloy along the liquidus line of the silicon side of the phase diagram has been calculated. Within the temperature range 943–1150 °C this activity can be represented by the equation[Formula: see text]

Ten-Vertex Polyhedral Monocarbaborane Chemistry. The Novel High-Yield Formation of the Ten-Vertex closo Compound [6-(PMe2Ph)-closo-1-CB9H9] from the Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11]

1993 ◽  
Vol 58 (12) ◽  
pp. 2924-2935 ◽  
Author(s):  
Jane H. Jones ◽  
Bohumil Štíbr ◽  
John D. Kennedy ◽  
Mark Thornton-Pett
Keyword(s):  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
High Yield ◽  
Monoclinic Space Group ◽  
The Novel ◽  
X Ray Diffraction ◽  
Metal Centre ◽  
X Ray ◽  
Yield Formation ◽  
Boiling Toluene

Thermolysis of [8,8-(PMe2Ph)2-nido-8,7-PtCB9H11] in boiling toluene solution results in an elimination of the platinum centre and cluster closure to give the ten-vertex closo species [6-(PMe2Ph)-closo-1-CB9H9] in 85% yield as a colourles air stable solid. The product is characterized by NMR spectroscopy and single-crystal X-ray diffraction analysis. Crystals (from hexane-dichloromethane) are monoclinic, space group P21/c, with a = 903.20(9), b = 1 481.86(11), c = 2 320.0(2) pm, β = 97.860(7)° and Z = 8, and the structure has been refined to R(Rw) = 0.045(0.051) for 3 281 observed reflections with Fo > 2.0σ(Fo). The clean high-yield elimination of a metal centre from a polyhedral metallaborane or metallaheteroborane species is very rare.

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