Neodymium(3+) acetate

Melting point / freezing point

Link to relevant study record(s)

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

07 June 2017 to 20 June 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Key result

Decomposition:

yes

Decomp. temp.:

287 °C

Table 1: Thermographic data

Thermal Event	Interpretation	Temperature (°C)
		Determination 1	Determination 2
Endotherm	Dehydration	109 to 198	93 to 196
Endotherm	Possible crystallographic transformation	201 to 273	197 to 269
Endotherm	Onset of decomposition	299	287

 

DISCUSSION

- Additional thermograms were performed to help interpret the thermal events in the two determinations. The initial major endotherm was considered to be the test material dehydrating. This was followed by an endotherm that was possibly a crystallographic transformation. The third group of endotherms was probably a series of decomposition. No melting of the test material was evident.

- Duplicate determinations using a nitrogen atmosphere were also performed and had similar thermographic profiles and residue appearance. This suggested that the decomposition was probably thermal and not oxidative.

- The samples lost approximately 33 % of their original mass after being heated to 400 °C.

Conclusions:

Under the conditions of this study decomposition was observed from approximately 287 °C (560 K) but no melting point could be determined.

Executive summary:

The melting point of the test material was investigated in accordance with the standardised guidelines OECD 102 and EU Method A.1. under GLP conditions using differential scanning calorimetry.

As the test material decomposed, no value for the melting point could be determined. Additionally, the test material began to dehydrate from approximately 93 to 198 °C and may have undergone a crystallographic transformation from approximately 197 to 273 °C.

Under the conditions of this study decomposition was observed from approximately 287 °C (560 K) but no melting point could be determined.

Description of key information

Under the conditions of this study decomposition was observed from approximately 287 °C (560 K) but no melting point could be determined.

Additional information

The melting point of the test material was investigated in accordance with the standardised guidelines OECD 102 and EU Method A.1. under GLP conditions using differential scanning calorimetry. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

As the test material decomposed, no value for the melting point could be determined. Additionally, the test material began to dehydrate from approximately 93 to 198 °C and may have undergone a crystallographic transformation from approximately 197 to 273 °C.

Under the conditions of this study decomposition was observed from approximately 287 °C (560 K) but no melting point could be determined.