THE HEATS OF FUSION AND TRANSITION OF ALKALINE EARTH AND RARE EARTH METAL HALIDES

Journal Article · Fri Mar 01 00:00:00 EST 1963 · Journal of Physical Chemistry (U.S.)

DOI:https://doi.org/10.1021/j100797a038· OSTI ID:4712891

Dworkin, A S; Bredig, M A

The heats of fusion of fifteen rare earth and alkaline earth halides were measured by means of a copper block drop calorimeter. The salts and their heats of fusion in kcal mole/sup -1/ are LaCl/sub 3/, 13.0; PrCl/sub 3/, 12.1; NdCl/sub 3/, 12.0; C eI/sub 3/, 12.4; PrI/sub 3/, 12.7; NdI/sub 3/, 9.7; CaCl/sub 2/, 6.78; CaBr/sub 2/, 6.95; C aI/sub 2/, 10.0; SrCl/sub 2/, 3.88; SrBr/sub 2/ 2.50; SrI/sub 2/, 4.70; BaCI/sub 2/, 3.90; BaBr/sub 2/, 7.63; and BaI/sub 2/, 6.34. The four salts which showed a transition, their temperatures of transition in deg K and their heats of transition in kcal mole/sup -1/ are Ndl/sub 3/, 847, 3.4; SrCl/sub 2/, 1003, 1.65; SrBr/sub 2/, 918, 2.90; and BaCl/sub 2/, 1193, 4.1O. The high temperature forms of SrBr/sub 2/ and BaCl/sub 2/ are believed to have the fluorite type of stracture characterized similarly as in CaF/sub 2/ and SrCl/ sub 2/ by an unusually low entropy of fusion, probably because a high degree of disorder occurs in that structure at elevated temperatures. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-028870
• OSTI ID: 4712891
• Journal Information: Journal of Physical Chemistry (U.S.), Vol. Vol: 67; Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
ALKALINE EARTH METALS
BARIUM BROMIDES
BARIUM CHLORIDES
BARIUM IODIDES
CALCIUM BROMIDES
CALCIUM CHLORIDES
CALCIUM IODIDES
CALORIMETERS
CERIUM IODIDES
COPPER
FUSION HEAT
HEATING
LANTHANUM CHLORIDES
NEODYMIUM CHLORIDES
NEODYMIUM IODIDES
PRASEODYMIUM CHLORIDES
PRASEODYMIUM IODIDES
RARE EARTHS
STRONTIUM BROMIDES
STRONTIUM CHLORIDES
STRONTIUM IODIDES