Browsing by Author "de Bruin, HJ"

Now showing 1 - 7 of 7
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    Atomic diffusion in ceramic oxides
    (Australian Atomic Energy Commission, 1967-12) de Bruin, HJ; Bradhurst, DH; Walker, DG
    Diffusion mechanisms in ceramic oxides are considered and available data in the literature broadly reviewed. It is noted that a simple correlation for cation self-diffusion in oxides based on structural considerations is not likely to eventuate, although some correlation for oxygen diffusion should exist. Greater sensitivity is required to study diffusion in oxides than can be obtained by conventional tracer lapping. The less common methods that may be applicable are reviewed.
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    Determination of traces of oxygen in sodium metal by infrared spectrophotometry: Part 1.
    (Australian Atomic Energy Commission, 1958-06) de Bruin, HJ; Smythe, LE
    The principal methods for the determination of traces of oxygen in sodium metal.
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    The extraction of beryllium by triisooctylamine in the presence of oxalate ion.
    (Australian Atomic Energy Commission, 1961-07) de Bruin, HJ; Temple, RB
    Beryllium ions can be extracted into organic solvents by tertiary amines, in the presence of compounds which give rise to anionic complexes. The nature of the extracted species has been investigated for the system beryllium/oxalate/triisooctylamine; it appears to be Be(C2O4)2 [Nh(i-C8H15)3]2. The beryllium/oxalate/water system has been examined by the method of pH titration in the absence of the organic phase. Under the conditions chosen, the dissociation constants for oxalic acid were found to be K1= 4.64 x 10-2 and k2 = 1.20 x 10-4, and the stability constants for the beryllium oxalate complexes β1=6.32 x 10³ and β2 =3.91 x 10 5.
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    The extraction of beryllium by triisooctylamine, the effect of the anionic complexing agent.
    (Australian Atomic Energy Commission, 1961-09) de Bruin, HJ; Kairaitis, D; Temple, RB
    The extraction of beryllium by triisooctylamine was measured over the pH range from 1 to 10, in the presence of malonic, maleic, succinic, phthalic, and salicylic acids. Values were obtained for the stability constants of the various metal-acid complexes by potentiometric titration. Values for these constants have not hitherto been published. The degree of extraction is dependent on the abundance of the anionic complex present in the aqueous phase and this is in turn dependent on the strength of the corresponding acid and the stability of the complex.
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    Formation constants of the beryllium thenoyltrifluoracetonates
    (Australian Atomic Energy Commission, 1961-09) de Bruin, HJ; Temple, RB
    The formation constants of the mono— and bis—thenoyltrifluoroacetone complexes of beryllium have been measured by a solvent extraction method. The values found are β1 = 3.40 x 105, and β2 = 1.21 x 1011, in a medium of ionic strength 0.1, at a temperature of 25º ± 0.1º.
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    Particle size analysis of tungsten metal powder.
    (Australian Atomic Energy Commission, 1957-05) de Bruin, HJ; Cairns, RC
    A method of particle size analysis for sub-sieve, tungsten metal powder has been developed using the Andreason pipette. Use of 1/4 percent by volume of tungsten powder in demineralised water gives minimum agglomeration. The method is useful for comparing the distribution of different batches of tungsten powder. No correlation between results from this method and the microscopic counting method used by the suppliers of the powder was found.
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    Quantitative studies in complex chemistry. Part 1 electrometric methods
    (Australian Atomic Energy Commission, 1961-07) de Bruin, HJ; Florence, TM
    Methods for the determination of stability constants are considered with particular reference to the method of pH titration. Mathematical derivations proposed by several authors are discussed and rationalised by using a common symbolism. The use of acid association constants is advocated in preference to dissociation constants. The authors' current work on the beryllium/oxalate system is used to illustrate the methods. Suggestions are made for the application of the fundamental data to problems in chemical processing and analytical chemistry.