Registration Dossier
Registration Dossier
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EC number: 832-253-5 | CAS number: 12165-18-3
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
No key information is available on the melting point of dipraseodymium dizirconium heptaoxide. However, based on a weight of evidence approach including data available for its individual constituents praseodymium(III,IV) oxide and zirconium dioxide, the melting point of the substance can be concluded to be > 2183°C.
Key value for chemical safety assessment
Additional information
1. Information on praseodymium(III,IV) oxide
Based on information obtained from the CRC handbook of chemistry and physics (Lide, 2009) the melting point of praseodymium(III,IV) oxide is 2183°C.
2. Information on zirconium dioxide
According to the CRC handbook of chemistry and physics (Lide, 2001) and the Merck Index (O'Neil, 2006), the melting point of zirconium dioxide is 2710 and 2680°C, respectively.
3. Conclusion on the substance dipraseodymium dizirconium heptaoxide
It is expected that the substance has a similarly high melting point as its individual constituents praseodymium(III,IV) oxide and zirconium dioxide. The melting point of the substance is expected to be higher than the lowest melting point of its individual constituents, i.e. > 2183°C. No exact value is required since melting points > 300°C are considered environmentally irrelevant.
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