THERMAL ANALYSIS OF THE SYSTEM BeCl$sub 2$-BeF$sub 2$

Journal Article · Wed Jan 01 04:00:00 EST 1958 · Nauch. Doklady Vysshei Shkoly Khim. i Khim. Tekhnol.

OSTI ID:4246322

Kuvyrkin, O N; Breusov, O N; Novoselova, A V

Thermal investigation of the BeCl/sub 2/--BeF/sub 2/ leading to a phase diagram is reported. Beryllium hydroxide was converted into beryllium oxide by annealing at 1000 deg C and then converted into beryllium chloride by chlorination with carbon tetrachloride at 1000 deg . Beryllium fluoride is obtained by thermal decomposition of (NH/sub 4/)BeF/sub 4/ in vacuum. The thermal analysis of the system BeCl/sub 2/--BeF/sub 2/ was carried out by means of Kurnakov PK-52 pyrometer with platinum-platinum-rhodanid. The fluorides and chlorides of beryllium form a simple eutectic with the composition 72.5 mole% BeF/ sub 2/, and a melting point at 306 deg C. The thermal analysis shows a weak endothermal effect at 110 deg C, which indicates the transformation of unstable beryllium fluoride into a highly stable form. The melting point of beryllium fluoride is 421 deg C. The heating curves of the samples show effects at temperatures higher than the liquidus temperature, which indicates the boiling of the BeCl-BeF/sub 2/ melt. (TCO)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-13-020242
• OSTI ID: 4246322
• Journal Information: Nauch. Doklady Vysshei Shkoly Khim. i Khim. Tekhnol., Journal Name: Nauch. Doklady Vysshei Shkoly Khim. i Khim. Tekhnol. Vol. Vol: No. 4
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANNEALING
BERYLLIUM CHLORIDES
BERYLLIUM FLUORIDES
BERYLLIUM HYDROXIDES
BERYLLIUM OXIDES
BOILING
CARBON TETRACHLORIDE
CHLORINATION
DECOMPOSITION
DIAGRAMS
EUTECTICS
HEATING
HIGH TEMPERATURE
MELTING POINTS
METALLURGY AND CERAMICS
NITROGEN HYDRIDES
PHASE DIAGRAMS
PYROMETERS
TEMPERATURE
THERMOCOUPLES
THERMODYNAMICS
THERMOMETERS
VACUUM