Equivalent Pressure Concept for Air in Crossed Electric and Magnetic Fields

International audienceMicrocalorimetry was used to study the interaction between gaseous oxygen and NiO single crystals. The studies involved consecutive sorption of small and large oxygen doses at 1000 K. Fast and slow processes of oxygen incorporation into NiO were distinguished. The fast process involved oxygen sorption in the near-surface layer. Then oxygen incorporation was ratecontrolled by a slow lattice diffusion in the crystalline bulk. A power of oxygen pressure dependence was found (1/n = 1/4.25) which was consistent with the defect structure of NiO. Heat of formation of cation vacancies was determined [Δ_f=155 kJ/mole]

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Application of microcalorimetry in studies of interaction between oxygen and NiO single crystals

Lalauze

Soustelle

Rękas

et al. 1983

Oxid Met

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Measurement of Townsend's first ionization coefficient for air in transverse electric and magnetic fields

Bhiday¹,

Paithankar²,

Sharda³

1970

J. Phys. D: Appl. Phys.

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The measurements of the first ionization coefficient α/p for air, without and with transverse magnetic fields, are reported in this paper. These were carried out using coaxial cylindrical electrodes to reduce the loss of electrons due to their drift in the E×H direction. The range of measurement covered the values of E/p between 200 and 600 V cm−1 torr−1 and those of H/p between 200 and 1400 G torr−1. The validity of the equivalent pressure concept was tested for the complicated medium like air. It has been shown that a satisfactory agreement between the theoretical and experimental values of α/p, H/p and E/p was obtained for low values of E/p (<300 V cm−1 torr−1) provided the collision frequency was taken to be an increasing function of E/p, instead of a constant as was assumed for hydrogen. At higher values of E/p (> 300), however, the observed values of α/p, H/p and E/p were below those calculated on the basis of the equivalent pressure concept. A few measurements of α/p were also carried out using the pressure variation technique, and its operational utility has been established from the identical nature of the results.

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Equivalent Pressure Concept for Air in Crossed Electric and Magnetic Fields

Cited by 2 publications

References 6 publications

Application of microcalorimetry in studies of interaction between oxygen and NiO single crystals

Application of microcalorimetry in studies of interaction between oxygen and NiO single crystals

Measurement of Townsend's first ionization coefficient for air in transverse electric and magnetic fields

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