Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Dissociation Pressures of Various Metallic Oxides
Kumasaburo KoderaIsao KusunokiShinkichi Shimizu
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1968 Volume 41 Issue 5 Pages 1039-1045


Gases evolved during a vacuum heat treatment of various oxides were analyzed by means of an omegatron mass spectrometer. Carbon dioxide, carbon monoxide and water were detected as main gases evolved at lower temperatures. Oxygen due to thermal dissociation of ZnO, CdO, NiO, CuO, Cu2O, and WO3 was found at high temperatures. In the case of MoO3, however, evolution of oxygen was not observed. The equilibrium pressures of the evolved gases over these oxides have been measured with a McLeod gauge and a Knudsen gauge. The oxygen dissociation pressures of ZnO, CdO, NiO, CuO, and Cu2O were measured and compared with the calculated values.

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