Polymorphism
Abstract
Molecular substances, as a rule, manifest themselves in more than one crystalline form. And it may happen that two members of a given family, under given conditions of temperature and pressure, do not adopt the same form. Polymorphism, for that matter, is a fascinating and at the same time complicated phenomenon. For the treatment of polymorphism of a given substance, it is a sine qua non to take into account the influences of temperature and pressure. The chapter starts with an historical overview.