Zirconium oxide (ZrO2), erbium-doped

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

weight of evidence

Justification for type of information:

Based on a weight of evidence approach using melting point data for the individual substances zirconium dioxide (around 2700°C, Lide, 2001; O'Neil, 2006) and dierbium trioxide (2344 °C, Lide, 2009), the melting point of erbium zirconium oxide can be expected to be at least > 2344°C, being environmentally irrelevant.

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Reason / purpose for cross-reference:

read-across source

Key result

Melting / freezing pt.:

> 2 344 °C

Reference 2

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

no data

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Principles of method if other than guideline:

Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor were the experimental methods.

GLP compliance:

no

Melting / freezing pt.:

2 680 °C

Conclusions:

The melting point under the study conditions was reported to be 2680 degrees C.

Reference 3

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

no data

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Principles of method if other than guideline:

Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor were the experimental methods.

Melting / freezing pt.:

ca. 2 710 °C

Conclusions:

The melting point under the study conditions was reported to be 2710 degrees C.

Reference 4

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

not reported

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Remarks:

Valid with restrictions. This is peer reviewed data where the test methodology and identity of the substance have been evaluated, and a reliable and representative value for the endpoint has been selected. No information on GLP status or test guideline followed is available.

Qualifier:

no guideline available

Principles of method if other than guideline:

Handbook data does not specify the method. Data from peer reviewed source.

GLP compliance:

not specified

Type of method:

other: Not specified

Melting / freezing pt.:

2 344 °C

Conclusions:

The melting point of the test material is 2344 °C.

Executive summary:

The melting point of the test material is 2344 °C.

Description of key information

1. Information on zirconium dioxide (CAS# 1314-23-4)
Two peer-reviewed data from handbooks (2710 and 2680 °C)
2. Information on erbium oxide (CAS# 12061-16-4)
Peer-reviewed data from handbook (2344 °C).
3. Conclusion on erbium zirconium oxide
Using a weight of evidence approach based on individual data for zirconium dioxide and erbium oxide it is expected that erbium zirconium oxide has a similarly high melting point.

Additional information

1. Information on zirconium dioxide (CAS# 1314-23-4)

Although only two values are available it can be safely concluded that the melting point of zirconium dioxide is approximately 2700 °C, making it environmentally irrelevant. The difference between the reported handbook results is assumed to be caused by the error of measurement at high melting temperatures.

2. Information on erbium oxide (CAS# 12061-16-4)

A value for the melting point of the substance was obtained from a peer reviewed handbook. The melting point of the substance is reported to be 2344 °C.

3. Conclusion on erbium zirconium oxide

It is expected that the substance has a similarly high melting point as the read across substances zirconium dioxide and erbium oxide. No exact value can be derived, however, this is not necessary as the high melting point is environmentally irrelevant.