抄録
Colour problems of lead mono oxide crystal were studied.
We confirmed at first the range of metal hydroxides to produce lead mono oxide on the reaction with lead salts, and the transformation conditions were investigated for lead mono oxide crystal in the process of the reactions.
Then lead mono oxide crystals thus produced were subjected to
(1) the examination of the relation of colour to temperature,
(2) the microscopic observation,
(3) the X ray analysis of the powder method,
(4) and the emission spectroscopic analysis.
The theoretical and experimental treatment in this paper verifies that the colour difference of lead mono oxide crystal, which is occured from the process of the formation, must be caused from
(1) the difference of the crystal structure,
(2) the difference of the direction of crystal growth,
(3) the adsorption or insertion of other phases,
(4) and the combination of (1), (2) and (3).
