Hardness of { lOT0) ZnO Surfaces Immersed in an Electrolyte," J . Appl. Phys., 49 121 614 ~1 7 (1978). "'J. S . Ahearn, J. I. Mills, and A . R. C. Westwood. "Effect of Electrolyte pH and Bias Voltage o n the Hardness of the (0001) ZnO Surface," J . Appl. Phys., 49 [I] Y6-102 (1978). 'IJ. S. Ahearn. J.

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Electronic conductivity and Seebeck coefficients of LaFeOJ were measured as a function of temperature (1000" to 1400°C) and P ( 0 2 ) (10' to Pa). Electronic conduction was found to be n-type in the lower P(Oz) range, and p-type in a higher P ( 0 2 ) range. The calculated carrier mobilities suggest a hopping-type conduction mechanism. The carrier concentrations were calculated as a function of P(Oz) and the defect structure was described. It was found that the electrical properties of LaFeOJ are determined not only by the concentration of oxygen vacancies, but also by the LdFe ratio.