Ke. German et al., INVESTIGATION OF PHASE-TRANSITIONS AND OTHER PHYSICOCHEMICAL PROPERTIES OF PERTECHNETATES AND PERRHENATES OF ALKALI AND ORGANIC CATIONS, Radiochimica Acta, 63, 1993, pp. 221-224
The paper presents data on phase transitions in pertechnetates. All tr
ansformations are endothermic. The first value in parenthesis is the t
emperature of the phase transition in K, the second is the enthalpy De
lta H of the phase transition in kJ/mol: KTcO4 (753; 5.2), KReO4 (808;
0.1), Bu(4)NTcO(4) (345; 19.0), Bu(4)NReO(4) (371; 7.3), CsTcO4 (420;
0.86), Et(4)NTcO(4) (318; 5.0). Fusion temperature and enthalpy: KTcO4
(815; 28.4), Bu,NTcO4 (508; 20.9).