The Transport of Beryllium in Beryllium Dichloride Vapour,

Experiments on the transfer of beryllium in beryllium chloride at pressures of about 0.00014 atmospheres have been made in the temperature range between 1250 and 1500K. The transport can be well interpreted as resulting from the reaction Be solid BeCl2g. The interpretation, however, cannot be reconciled with the mass spectroscopic investigation by Hildenbrand and Theard on the enthalpy of formation of monomer beryllium monochloride gas. With a reasonably estimated value for the entropy of the molecule BeCl2 the transport can be interpreted as resulting from Be s BeCl2g BeCl2g but this leads to a heat of association of monomer monochloride to the dimer which is very high, of the order of -90 kcal. Author