Aluminium lanthanum trioxide

Boiling point

Link to relevant study record(s)

Reference

Endpoint:

boiling point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016-03-24 to 2016-05-31

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 103 (Boiling Point)

Version / remarks:

1995

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.2 (Boiling Temperature)

Version / remarks:

2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2013-03-22

Type of method:

differential scanning calorimetry

Key result

Remarks on result:

other: no boiling point up to 650 °C

Open aluminium crucibles

In the temperature range of 300 °C – 380 °C, an endothermic effect was observed, which cannot be assigned to the melting of the test item due to its low energy of approximately +10 J/g.

Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss [mg]	Atmospheric pressure [hPa]
16.27	---	300 – 380 (endo)	0.08	1012
15.63	---	310 – 380 (endo)	0.03	1012

Open glass crucibles

During the heating phase endothermic effects were observed in the temperature range of 300 – 380 °C and 500 – 610 °C with an overall energy of +80 J/g and +20 J/g, respectively. No weight loss was occurred and the test item shows unchanged after the measurement. These effects cannot be assigned to melting or boiling of the test item due to the respective low energy of each effect and the broad peaks of the DSC-signals. A major weight loss or change in appearance of the test item were not observed

Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss [mg]	Atmospheric pressure [hPa]
9.02	---	300 – 380 500 – 610	+10 +70	998.1
15.14	---	300 – 380 540 – 600	+10 +10	997.0

Closed glass crucibles

During the heating phase an endothermic effect was observed in the temperature range of 380 – 440 °C with an energy of +10 J/g. This effect cannot be assigned to melting or boiling of the test item due to its low energy and the broad peak of the DSC-signal.An exothermic effect was detected in the temperature range of 490 – 590 °C with an energy of -10 J/g and -20 J/g, respectively.

Sample weight [mg]	Onset of Effect [°C]	Range of effect [°C]	Weight loss [mg]	Atmospheric pressure [hPa]
10.51	---	380 – 430 490 – 590	+10 -20	1008.1
11.10	---	390 – 440 500 – 580	+10 -10	997.0

The test item aluminium lanthanum trioxide did not melt or boil up to 650 °C, however, minor endo- and exothermic peaks were observed. Melting and boiling can be excluded as these are endothermic reactions with a higher energy demand than the one observed. For the test item Aluminium lanthanum trioxide (AlLaO₃), it is most likely that the peaks indicate a change in the crystal structure (e.g. metastable to stable phase). Other reactions may be excluded for the following reasons:

- Oxidation is not possible; all elements are in the highest possible oxidation state,

-Reaction not likely at this temperature range due to the lack of reactants,

- Decomposition is not likely since a split-off of oxygen is highly unlikely based on the expected strong oxidation properties of oxygen (AlLaO₃is fully oxidized),

-No major loss of sample weight

- The sample did not change in color or structure

Conclusions:

In a differential scanning calorimetry test according to Regulation EC No. 440/2008 Method A.2. and OECD TG 103 (1995), aluminium lanthanum trioxide did not melt and boil up to 650 °C.

Description of key information

In a differential scanning calorimetry test according to Regulation EC No. 440/2008 Method A.2. and OECD TG 103 (1995), aluminium lanthanum trioxide did not melt and boil up to 650 °C.