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The two-word title of this book can only give an indication about
its content and approach to the subject it deals with. In the
course of time, the term has gradually become somewhat blurred. The
reason is easy to see: similar problems are now more and more
frequently studied by different branches of natural science. The
term "mixed crystals" has acquired specific connotations in
physics, chemistry, biology, and geology. One and the same term can
now serve as a name for things which are either not quite the same
or sometimes quite different. And this is precisely what happened
to the two words in the title of the book. One of them, the term
"crystal," for which crystallography had an un ambiguous
definition, is now employed by biologists to describe the structure
of cell membranes and by chemists who use it to denote degrees of
polymer crystallinity. "Crystal" has thus become a broad term that
can help describe any solid, or just a condensed state of a
substance, if the solid has a suf ficient degree of order in the
arrangement of its components. But the book is called " lixed
Crystals." The other word in its title, the adjective "mixed," has
also developed several meanings. It is now thought ap plicable to
both homogeneous and heterogeneous systems, that is, to crystals
composed of different molecules and also to solids that are a
mixture of crys tals with different structures."
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