Kimura, Kiichi

Ohira, Kyozo

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Title Electron Bombardment Conductivity of BaO+SrOAuthor(s)Kimura, Kiichi; Ohira, KyozoCitation京都大学化学研究所報告 (1950), 20: 41-41Issue Date1950-03-20URL http://hdl.handle.net/2433/74072RightType Departmental Bulletin PaperTextversionpublisherKyoto University          — Abstracts of Papers  —  -         The following 36 abstracts are the first part out of 73 papers         read at the lecture meeting on  10th and 11th November 1949.      1. Electron Bombardment  Conductivity of  Ba0+Sr0.                  Kiichi  Kimura and Kyozo Ohira.    It has been expected that impurity level of  BaO+SrO lies 1.4 e. v. below the bottom of conduction band, from the theremionic data, by assuming that the im-purity states are partially occupied.    In order to verify this directly we observed the resistance change of  BaO+SrO by electron bombardment and  found that the trough occurred at about 1.55 e. v.    Results:- 1. Plotting the resistance against the accelerating voltage, we found the trough as  follows:          Incident  beam..(pA.) Trough (Volt.)     0.5 0.8    1.0 1.0     2.0 1.35     5.0 1.5     >5.0 1.65             2. The trough becomes deeper in compliance with increasing incident current.  Discussion  :- 1. Kinetie energy of incident electron, when the trough occurs, is where  V  : reading of the voltage meter,  i: incident current,  rA: p-ammeter resis-tance, work function of oxide. -1.7  e.  v.  02: work function of Th-W.  -3.0 e. v.  2EA  : heating voltage of emitter,  E0: kinetic energy just outside the cathode and is given as  .  4n  ern* kT e- s')IkT  h3 de.  Bo when  i= 5pA,  V=1.5 e. v.  .*.  E1.55f0.5 e. v.                2. We think that the trough depends on the increase of free elec-trones excited to the conduction band from the impurity level by the kinetic energy of incident electron.  41  )

Electron Bombardment Conductivity of BaO+SrO

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Electron Bombardment Conductivity of BaO+SrO

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