The calcination of dolomite. Part I.—The kinetics of the thermal decomposition of calcite and of magnesite
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The thermal degradation of polyvinyl acetate. I. Products and reaction mechanism at low temperatures
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Weathering Sequence of Clay‐size Minerals in Soils and Sediments
Abstract Studies were made of several clays of soils and other deposits to clarify the nature of weathering of layer silicates. Data obtained by X‐ray diffraction, thermal, R(OH)n sorption, and elemental analyses lead to the proposal of general occurrence of interstratified X‐amorphous zones in 2:1 layer silicates. As…
The p‐phenylene linkage in linear high polymers: Some structure–property relationships
Abstract The high crystallite melting point of polyethylene terephthalate (Terylene) compared with the melting points of the aliphatic polyesters emphasizes the significance of the p ‐phenylene linkage as an important factor determining polymer properties. A consideration of other polymer structures containing the p ‐…
Théorie du traînage magnétique de diffusion
Après avoir rappelé l'existence et la théorie du traînage de fluctuations (ou traînage irréversible), l'auteur développe une théorie du traînage magnétique de diffusion (ou traînage réversible) selon laquelle les atomes étrangers interstitiels, qui sont à l'origine du phénomène, agiraient par couplage magnétocristalli…
681. Studies in co-ordination chemistry. Part XIII. Magnetic moments and bond types of transition-metal complexes
F. H. Burstall and R. S. Nyholm, J. Chem. Soc., 1952, 3570 DOI: 10.1039/JR9520003570
On the generation of vacancies by moving dislocations
New experiments of Molenaar and Aarts, Blewitt and others seem to confirm the view of the author, previously based only on the experiments of Gyulai and Hartly and Stepanow on sodium chloride, that vacant lattice sites, and possibly interstitial atoms, are generated during plastic flow in ductile crystals, particularl…
Failure and Fracture of Metals as Nucleation Processes
The discontinuous phenomena in plasticity of metals, such as the yielding, the state of ultimate strength and the brittle fracture, were regarded as a kind of Markoff process, and studied from the standpoint of nucleation theory. The fundamental features of these types of failures, namely, (1) the relation between str…
Propagation of a Boundary of Fusion
We consider a volume of material, divided into two regions 1 and 2. each of density ρ, by a moving surface S. On S a change of phase occurs, at a definite temperature (which we may take to be zero) and with absorption or liberation of a latent heat L per unit mass. If θ l , k l , K 1 are the temperature, thermal condu…
Ferrites
With d.c. electrical resistivities several orders of magnitude greater than those of the ferromagnetic metals, and magnetic saturation intensities in some cases less than one order of magnitude smaller, the ferrites gave promise of greater `effective permeability' and lower `eddy-current' loss in high-frequency magnet…
Transition Energy and Volume Change at Three Transitions in Barium Titanate
The specific heat and thermal expansion of high purity BaTiO 3 ceramics have been measured at temperatures from -120° to 150°C with the following results:
On the Phase Transition in Cuprous Iodide
The phase transition and the crystal structures of cuprous iodide (CuI) have been studied by the X-ray and calorimetric measurement Two phase transitions at 369°C and 407°C were found and the corresponding energy and entropy changes were estimated from the specific heattemperature curve. The crystal lattice of γ, β an…
944. Conjugated macrocylces. Part XXII. Tetrazaporphin and its metallic derivatives
R. P. Linstead and M. Whalley, J. Chem. Soc., 1952, 4839 DOI: 10.1039/JR9520004839
Phase Transitions in Solid Solutions of PbZrO3and PbTiO3(II) X-ray Study
The phase diagram of the whole range of the PbZrO 3 -PbTiO 3 system was determined by the dielectric and dilatometric measurements. According to the reason shown in part I, this phase diagram can be divided into three regiors; paraelectric, ferroelectric and antiferroelectric phases. The crystal structure of this syst…
A general approach to hysteresis
D. H. Everett and W. I. Whitton, Trans. Faraday Soc., 1952, 48, 749 DOI: 10.1039/TF9524800749
Measuring rate of dustfall R. R. Paxton
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Der hochtemperaturofen im zementlabor
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New board and lath plant
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Dust collecting system
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La flotación y la industria del cemento. II - Proceso de separación de minerales utilizado por la Lone Star's New Argentina Plant
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