Magnetochemistry
Cód:
491_9781443724890
MAGNETOCHEMISIRY by PIERCE W. SELWOOD. PREFACE: People who write books in wartime should have compelling reasons for doing so. This book was started before the full impact of the war effort reached the shores of Lake Michigan. It was finished in the hope that it might contribute, however infinitesimally, to the labors of that army of scientists who seek through natures secrets to parry the blows of an ingenious and pitiless enemy. Magnetochemistry began with Michael Faraday more than one hundred years ago. It enjoyed a vigorous growth under the guidance of Pierre Curie and A. Pascal at the end of the 19th and beginning of the 20th centuries, but it did not reach its prime until Gilbert N. Lewis pointed out the relationship between atomic magnetic moment and chem ical valence. The past few years have seen magnetic susceptibility take its place along with dielectric constant, electron diffraction, x-ray diffrac tion, and molecular and atomic spectra, as one of the most powerful tools at the disposal of the chemist. In order to keep the book within reasonable bounds, it has been neces sary to define magnetochemistry rather severely. The following defini tion has been adopted Magnetochemistry is the application of magnetic susceptibilities and of closely related quantities to the solution of chemical problems. No more than mention will be found of several important branches of magnetism, particularly of magnetooptical phenomena, of the gyromagnetic effect, and of adiabatic demagnetization. The field of atomic magnetism has been slighted, so far as the theoretical side is con cerned, and little has been said of technologically important magnetic properties of the ferrous alloys. But these are topics which have received more than adequate treatment elsewhere. On the other hand, I have tried to omit no major branch of magneto chemistry, so defined. It is especially hoped that no important applica tion of magnetism to structural chemistry has been overlooked. The litera
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