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BOOKS AND R E V I E W S 101 Books and Reviews Several interesting review articles appeared during the course of the year: LeBlanc (1) gave an extensive review of the conductivity of organic crystals and included a bibliography with many re fer - ences Helfrich (2) reviewed the conduction of organic solids in the light of space-charge-limited and volume-controlled theories Lamberts (3) discussed the experimental results and theories per- taining to electrical conduction in pure insulating liquids A more popular survey was given by Simmons (4), who reviewed simple energy band concepts, conduction processes in metal- msulator-metal systems, and the Poole-Frenkel effect Possible applications to memory devices were also discussed Theoretical Work Polaron theory continues to receive attention in theoretical work- Schnakenberg (6) mvestigated impurity hopping conduction in polar lattices and amorphous substances by a canonical transformation of small polaron theory Examining experimental work, Schmid (7) presented arguments for identifying the small polaron as the charge c a r r i e r in glasses contaimng transition metal oxides Larsen (8) calculated the polaron effective mass by a variational method for the intermediate coupling case; and Kahn (9) applied the polaron weak coupling approximation to the problem of an electron on a spheroidal energy surface interacting with longitudinal optical phonons, and applied the results to S r T i 0 3 The theory of high-field conduction remains the subject of con- flicting opinions Mark and Hartmann (10) point out the difference between compensated and uncompensated donor-like levels in con- tributing to a Schottky-like current-voltage characteristic Yeargan and Taylor (11) consider the Poole-Frenkel effect with both donor and acceptor sites present and show that the degree of compensa- tion must be known in order to determine the work function Hartke (12) points out that Frenkel originally estimated the enhanced electrical conductivity expected for field-assisted thermal lomza- tion of trapped electrons by using a simple one-dimensional model.
