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EC number: 231-717-9
CAS number: 7699-43-6
Initial heating produced condensation on sides of the test tube above
the white solid substance. Further heating produced a liquid layer (most
probably water) above the solid. Still further heating produced a white
solid which did not change under prolonged heating. The residue (white
solid) was taken for XRD analysis and concluded to be monoclinic
zirconium dioxide. This confirms the decomposition of zirconium
dichloride oxide to zirconium dioxide via the release of water and
A rapid weight loss was recorded between the starting temperature (25°C)
and just below 200°C with significant weight loss starting around 60°C.
The weight loss was accompanied by a large endotherm where heat was
taken up by the substance with regard to the inert reference. This
process was identified as the loss or release of water and hydrogen
chloride from the substance as noted in the preliminary test. A
subsequent weight loss from 200°C and above, represented the continued
dehydration of the substance to form zirconium dioxide. Small exotherms
seen between 450°C and 500°C were concluded to be typical
crystallisation exotherms of zirconia. The exotherm from this DTA
analysis could not be quantified due to the nature of the equipment,
however the amount of heat generated was insignificant compared to the
temperature of the surroundings (400-500°C) and this exotherm is always
present within any routine production operation making zirconium
dioxide. Due to the limited amount of material used in the test there
was insufficient sample to further analyse the residue. However, as
determined in the preliminary test, the residue after heating was
concluded to be monoclinic zirconium dioxide.
Zirconium dichloride oxide was concluded not to melt before it decomposes, following Differential Thermal Analysis as described in the EC Method A.1 (Bradshaw , 2010, key study). Decomposition becomes significant starting from ca. 60°C.
Zirconium dichloride oxide decomposes to zirconium dioxide with the loss
of water and hydrogen chloride. Decomposition is indicated by a
significant weight loss starting at ca. 60°C (Bradshaw, 2010). The data
from Bradshaw (2010) are considered as key information. The results of
this study are supported by handbook data (Lide, 2001).
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