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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing 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 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)
Remarks:
signed 2013-03-22
Type of method:
differential scanning calorimetry
Key result
Decomposition:
no
Sublimation:
no
Remarks on result:
other: no melting 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.1. and OECD TG 102 (1995), aluminium lanthanum trioxide did not melt up to 650 °C.

Description of key information

Aluminium lanthanum trioxide has no melting point

Key value for chemical safety assessment

Additional information

Smeykal (2016): In a differential scanning calorimetry test according to Regulation EC No. 440/2008 Method A.1. and OECD TG 102 (1995), aluminium lanthanum trioxide did not melt up to 650 °C.

CRC (2008): TAluminium lanthanum oxide undergoes a transition, transformation at 500°C from a rhombohedral to a cubic form. No melting point was stated.

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