By Leonid I. Boguslavskii
In contemporary years, huge development has been made within the research of natural semiconductors. the most instructions of research, were made up our minds and big effects were completed within the theoretical remedy of many questions. despite the fact that, the variety of investigations is so vast that it truly is most unlikely to debate all branches totally in a brief monograph. in reality, the chemist synthe sizing platforms with conjugated bonds and learning their reactivity, the actual chemist learning the catalytic and absorption right ties of drugs with conjugated bonds, the physicist learning the photoelectric and magnetic features of dyes and polynuclear hydrocarbons, and the biologist trying to clarify the mechan ism of power move within the dwelling telephone -they are all operating within the box of natural semiconductors. Consequentiy, within the current booklet the authors haven't tried to incorporate either side of the matter of natural semiconductors. The monograph considers intimately purely these questions which seem to the authors to be such a lot fast and engaging. different questions are touched on merely to the level essential to illustrate the most fabric. The e-book starts off with an announcement of fabric that is of the character of a overview. the most periods of natural semiconductors are pointed out however the equipment for his or her education aren't illus trated intimately. a bit of extra realization is dedicated to the depen dence of features of natural semiconductors on their constitution and chemical composition.
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Example text
An investigation of the form of the line as a function of the conditions of preparation, the temperature of the measurement, and the impurities introduced gives information on the structure and electronic interactions in polymers with conjugated bonds [8-11]. 3. 5 and 30 Oe and the gfactor is close to the g-factor of a free electron. 4. Usually, the intensity of the signal rises with an increase in the dimensions of the system of conjugated bonds, although in some cases this is not obligatory. The intensity of the signal may correspond to a concentration of 10 15 -10 20 spins/g or one spin per 10 5-10 polymer molecules [7, 12].
The activation energies of conduction again increase. CONNECTION BETWEEN ELECTRIC AND PARAMAGNETIC PROPERTIES OF POLYMERIC SEMICONDUCTORS TO WHICH THE IDEAS DEVELOPED FOR MOLECULAR CRYSTALS ARE APPLICABLE Let us now consider the data available on the electrical and paramagnetic characteristics of polymeric semiconductors with linear systems of conjugated bonds with a conductivity close to that of insulators [28-30) and belonging to type 1. A parallel study of the electric'll and paramagnetic characteristics of the polyphenylacetylenes [12] has shown that the intensity of the EPR signal, which is easily detected in these polymers, obeys the Curie law.
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