Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 5, Issue 8
Displaying 1-4 of 4 articles from this issue
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  • Evaporated films
    Ryoji UEDA
    1962 Volume 5 Issue 8 Pages 306-309
    Published: August 20, 1962
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.5.306
    JOURNAL FREE ACCESS
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  • Experimental Study of Evaporated BaTiO3 Films
    Eiji SEKINE, Hiroo TOYODA
    1962 Volume 5 Issue 8 Pages 310-322
    Published: August 20, 1962
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.5.310
    JOURNAL FREE ACCESS
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    The films of BaTiO3 and (Ba-Sr) TiO3 were prepared with two types of evaporating methods. The several kinds of materials were used as substrates and their temperatures ranged from 200°C to 1200°C. The films were baked at various temperatures in air or O2. The crystallization was investigated by means of x-ray diffraction and electronmicroscope. For the case of platinum substrate, the crystallization was not appreciable for the substrate temperatures and also baking temperature up to 400°C and, thereabove, the crystalline size increased with the rise of temperature. The films, as they were evaporated, had low specific resistance and low dielectric constant and the baking them brought about the increase in these two values. A (Ba0.95 Sr0.05) TiO3 film, thus baked at 1200°C, had dielectric constant about 1500 at room temperature and dielectric anomalies were observed at the temperatures 100, 0, and -80°C
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  • A Study on the Effect of Backdiffusion and of Backstreaming on the production of Ultra High Vacuum
    Atsushi FUJINAGA, Takao HANASAKA, Hiroshi TOTTORI
    1962 Volume 5 Issue 8 Pages 323-330
    Published: August 20, 1962
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.5.323
    JOURNAL FREE ACCESS
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    A vacuum system with two oil diffusion pumps connected in series was constructed for obtaining the experimental data about the back-diffusion. These two pumps were of the same type, and the one was used as a main pump and the other was, so to speak, used as a booster pump to supply the main pump with the good fore vacuum. Several kinds of known gases such as hydrogen, helium, etc. were leaked separately into the fore vacuum side of the main pump, and the masses in the high vacuum side under these conditions were investigated by the omegatron type mass spectrometer.
    In the case of light masses, such as hydrogen or helium, the pressure ratio of the fore vacuum side to the high vacuum side was about 103, and this ratio increased to about 105 in the case of neon (mass 20). In the case of nitrogen, however, the back-diffusion was not found on account of the great enhancement of the pressure ratio to the order of more than 107.
    The behavior of the backstreaming of oil vapor was also investigated by the omegatron, and this observation implies that the oil vapor flowing through a channel is not able to be treated as a steady flow, but it has to be treated as a unsteady flow having the tendency to penetrate into the channel gradually.
    The speed of the penetration, considered through this observation, seems to be very slow, and for this reason, it is able to occur very often that the partial pressure due to oil vapor, in a vacuum chamber apart from the pump, is kept lower than the vapor pressure of it for several months.
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  • Erratum
    1962 Volume 5 Issue 8 Pages e1
    Published: 1962
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.5.8_e1
    JOURNAL FREE ACCESS
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