Yttrium chloride hexahydrate

Melting point / freezing point

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

06 July 2017 - 26 October 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Melting / freezing pt.:

> 600 °C

Atm. press.:

101.325 kPa

Decomposition:

no

Sublimation:

no

Remarks on result:

other: No melting point was recorded up to 600°C.

Assay No. 1 (isotherm at 25°C for 5 min, heating ramp: 25°C to 600°C at 10°C/min):

An endothermic peak was recorded at about 170°C and the baseline return was recorded at about 280°C. Several exothermic peaks were recorded between 400-450°C. After the assay, the powder remained white but was dehydrated and an overpressure was observed (the lid blown off its place). However, no melting point of the test item was recorded up to 600°C. As no endothermic peak was recorded after 300°C and as an overpressure was recorded, the next assay was performed up to 350°C.  

Assay No. 2 (isotherm at 25°C for 5 min, heating ramp: 25°C to 350°C at 10°C/min):

An endothermic peak was recorded at about 170°C and the baseline return was recorded at about 270°C. After the assay, the powder remained white but was dehydrated. No melting point of the test item was recorded up to 350°C.

Assay No. 3 (isotherm at 25°C for 5 min, heating ramp: 25°C to 350°C at 10°C/min):

An endothermic peak was recorded at about 170°C and the baseline return was recorded at about 280°C. After the assay, the powder remained white but was dehydrated. No melting point of the test item was recorded up to 350°C.

Conclusions:

The melting behaviour of yttrium trichloride hexahydrate was assessed according to the EU A.1 method and OECD test guideline 102 in compliance with GLP using Differential Scanning Calorimetry (DSC). No melting point of the test item was recorded up to 600°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:

not specified

Type of method:

other: not reported, handbook data

Melting / freezing pt.:

721 °C

Atm. press.:

101.325 kPa

Conclusions:

According to this peer-reviewed handbook, yttrium trichloride has a melting point of 721°C.

Description of key information

Demangel (2017; Klimisch 1) investigated the melting behaviour of yttrium trichloride hexahydrate according to the EU A.1 method and OECD test guideline 102 in compliance with GLP using Differential Scanning Calorimetry (DSC). No melting point of the test item was recorded up to 600°C. Therefore, this study was considered in a weight of evidence approach with melting point data reported in the CRC Handbook of Chemistry and Physics (2016, Klimisch 2). This handbook reports a melting point of 721°C for yttrium trichloride. This value can be used in the chemical safety assessment.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:

721 °C

Additional information

In the study of Demangel (2017), an endothermic peak was observed between ca. 170°C and 270-280°C. At the end of the study, the substance was still a white powder but was dehydrated. No melting was observed, however, the endothermic peak was most likely related to the solubilisation of yttrium trichloride in its hydration water and loss of the hydration water during heating.