Despite the considerable scientific and practical interest from the point of view compounds have been studied insufficiently so far. cm were of thermoelectricity, InP As In (1) only some alloy compositions with electron concentration n * 10 studied; in addition, the specimens were two-phase systems. In (2) the electron concentration range n for some alloy compositions a r e given and information on the thermoelectric effectiveness is not available, which, of course, gives an incomplete pattern of the propertiee of the materials of the given system. In addition, the data on the specific heat conductivity a r e assumed to be higher. More detailed results of investigations on n-type materials are given in (3, 4). As concerns p-InP As solid solutions it must be noted that the data on thermoelectric properties are almost not available in literature. 17-3 x 1-x -3 1016told8 cm was investigated, but in this case only datax 1-xWe have carried out a complex investigation of the thermoelectric and thermal properties of the semiconducting solutions of the InP-InAs system with n-and p-type conductivity. The study was carried out in a wide range of temperatures (80 to 900 K) and free carrier concentrations. Practically all intermediate compositions of n-type materials were studied, including the end components InAs, InP as well as p-type solid solutions of the following compositions: x = 0, 0.1, 0.2. 0.3. 0.6, 1. The specimens studied were perfect and homogeneous. The required alloy homogeneity was achieved by means of cyclic zone passages and repeated annealing and was checked by the micro-X-ray analyzer MAP-1.As a result of the study of resistivity e , thermoelectric power a , and specific heat conductivity 1~ of p-type materials, it was established that going from InAs to InP and with increasing hole concentration the region of intrinsic conductivity (as in the case of the n-type materials) and the u sign reversal point are shifted to higher temperatures (Fig. 1). The coefficient of thermoelectric effectiveness has 4 physica (a)
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