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The influence of the electrolyte on the composition of ‘anodic oxide films’ on tantalum
ii 3.
ABSTRACTS OF PAPERS TO APPEAR IN ISOTOPE EFFECT OF CARBON DIFFUSION IN A Fe—Si ALLOY M. Wuttig and E.T. Yen (Department of Metallurgical Engineering, University of Missouri)
J.
PHYS. CHEM. SOLIDS
Vol. 7, No. 9
tantalum in films formed in aqueous salt solution and very dilute acids has been shown. In films formed in concentrated acids the incorporation of anions of the type Ax Oy~ is so important 30 per cent of the total number of anions in the case of films formed in 95 per cent H2 SO4 that —
—
is no longer possible to consider these films as oxides. The results obtained by deduction from the analysis for oxygen are in good agreement with those obtained from direct analysis for nitrogen. The film properties (rate of chemical attack, dielectric constant, formation field, molar volume etc.) depend on the nature of the electrolyte used for formation. it
The isotope effect of carbon diffusion in dilute iron silicon alloys containing a Si and ~ has been measured below room temperature using the disaccommodation technique. The time dependence of the reluctivity has been analysed in terms of two relaxation processes which are due to the reorientation of carbon interstitials in Fe—Fe and Fe—Si sites respectively. The ratio of the relaxation the1.037 two for carbon 2C times 7~3/‘~2of is the isotopes ‘ the latter process in the former and‘~Cand 1.007 for Fe+2Si alloy. The ratios of the relaxation times of the same carbon isotope ‘2C contained in a dilute Fe+mSi and in a dilute Fe+a Si alloy respectively T,~/T 2~are 0.995 and 1.020 for the two processes mentioned. These results demonstrate clearly the many body aspects of the difussional process. (Received 29 January 1969)
4.
THE INFLUENCE OF THE ELECTROLYTE ON THE COMPOSITION OF ‘ANODIC OXIDE FILMS’ ON TANTALUM G. Amsel, C. Cherki, G. Feuillade and J.P. Nadai (Groupe de Physique des Solides de l’Ecole Normale Supérieure Tour 23, 9 Qusi Saint-Bernard, Paris 5ème)
(Received2426February December1969) 1968) (Revised
5.
Carl Cm. Wu and Barton Roessler (Division of Engineering, Brown University, Providence, Rhode Island 02912) The energy of ordering in the alloy CuPt was measured by means of tin solution calorimetry. The energy difference between a specimen quenched from above the critical temperature and a specimen completely long-range ordered is 1400 ±6Ocal/g-atom. (Received 27 November 1968) (Revised 5 February 1969)
6. We have studied the influence of the electrolyte on the composition of dielectric films formed by anodic polarisation of tantalum. The electrolytes used were mainly aqueous solutions of salts and acids (H2 SO4, H3P04, HNO3, etc.) at various concentrations. A new method of microanalysis of the light elements (NO, ~80,14 N and D) contained in the films has been coupled with the more classical methods of study (growth rate, capacity measurements, and the use of Redox systems in solution). The absence of large incorporation of elements other than oxygen and
THE ENERGY OF ORDERING IN THE ALLOY CuPt
PRESSURE DERIVATIVES OF ELASTIC MODULI OF VYCOR GLASS TO 8 kb Murli H. Manghnani and W.M. Benzirig (Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822)
Longitudinal- and shear-wave velocities in Vycor glass were measured to 8kb at 25°C,using the ultrasonic interferometry method. Corresponding bulk and shear moduli were also computed. The pressure derivatives of the shear-wave velocity and shear modulus at zero pressure were anomalously negative
ABSTRACTS OF PAPERS TO APPEAR IN ISOTOPE EFFECT OF CARBON DIFFUSION IN A Fe—Si ALLOY M. Wuttig and E.T. Yen (Department of Metallurgical Engineering, University of Missouri)
J.
PHYS. CHEM. SOLIDS
Vol. 7, No. 9
tantalum in films formed in aqueous salt solution and very dilute acids has been shown. In films formed in concentrated acids the incorporation of anions of the type Ax Oy~ is so important 30 per cent of the total number of anions in the case of films formed in 95 per cent H2 SO4 that —
—
is no longer possible to consider these films as oxides. The results obtained by deduction from the analysis for oxygen are in good agreement with those obtained from direct analysis for nitrogen. The film properties (rate of chemical attack, dielectric constant, formation field, molar volume etc.) depend on the nature of the electrolyte used for formation. it
The isotope effect of carbon diffusion in dilute iron silicon alloys containing a Si and ~ has been measured below room temperature using the disaccommodation technique. The time dependence of the reluctivity has been analysed in terms of two relaxation processes which are due to the reorientation of carbon interstitials in Fe—Fe and Fe—Si sites respectively. The ratio of the relaxation the1.037 two for carbon 2C times 7~3/‘~2of is the isotopes ‘ the latter process in the former and‘~Cand 1.007 for Fe+2Si alloy. The ratios of the relaxation times of the same carbon isotope ‘2C contained in a dilute Fe+mSi and in a dilute Fe+a Si alloy respectively T,~/T 2~are 0.995 and 1.020 for the two processes mentioned. These results demonstrate clearly the many body aspects of the difussional process. (Received 29 January 1969)
4.
THE INFLUENCE OF THE ELECTROLYTE ON THE COMPOSITION OF ‘ANODIC OXIDE FILMS’ ON TANTALUM G. Amsel, C. Cherki, G. Feuillade and J.P. Nadai (Groupe de Physique des Solides de l’Ecole Normale Supérieure Tour 23, 9 Qusi Saint-Bernard, Paris 5ème)
(Received2426February December1969) 1968) (Revised
5.
Carl Cm. Wu and Barton Roessler (Division of Engineering, Brown University, Providence, Rhode Island 02912) The energy of ordering in the alloy CuPt was measured by means of tin solution calorimetry. The energy difference between a specimen quenched from above the critical temperature and a specimen completely long-range ordered is 1400 ±6Ocal/g-atom. (Received 27 November 1968) (Revised 5 February 1969)
6. We have studied the influence of the electrolyte on the composition of dielectric films formed by anodic polarisation of tantalum. The electrolytes used were mainly aqueous solutions of salts and acids (H2 SO4, H3P04, HNO3, etc.) at various concentrations. A new method of microanalysis of the light elements (NO, ~80,14 N and D) contained in the films has been coupled with the more classical methods of study (growth rate, capacity measurements, and the use of Redox systems in solution). The absence of large incorporation of elements other than oxygen and
THE ENERGY OF ORDERING IN THE ALLOY CuPt
PRESSURE DERIVATIVES OF ELASTIC MODULI OF VYCOR GLASS TO 8 kb Murli H. Manghnani and W.M. Benzirig (Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822)
Longitudinal- and shear-wave velocities in Vycor glass were measured to 8kb at 25°C,using the ultrasonic interferometry method. Corresponding bulk and shear moduli were also computed. The pressure derivatives of the shear-wave velocity and shear modulus at zero pressure were anomalously negative