Magnetic Study of Some Hydrates of Boron Compounds

Abstract

Prasad and co-workers have recently established, from the measurements of the susceptibilities of a number of hydrated and anhydrous salts, that hydrates do not generally obey the additivity rule. Further, they have come to the interesting conclusion that the deviation from the additivity rule is closely connected with the number of molecules of water in the hydrate; in the case of several hydrates of the same salt, the departure from the additivity rule per molecule of water is highest for the hydrate containing the least number of molecules of water of crystallization and is least for the most stable hydrate. Boron is known to form several hydrated compounds. The polyborates are particularly interesting, since they can be dehydrated stepwise at suitable temperatures, and several intermediate hydrates can thus be prepared. The present paper deals with the study of the susceptibilities of the hydrated and anhydrous compounds containing boron and the examination of the applicability of the additivity law to hydrates.