Thermoelectricity Of Native Semiconductor Minerals And It Is Effect On Seismological Electric Field

Based on the thermoelectric theory of semiconductor minerals, and thermoelectric potential were tested for several kinds of common native semiconductor minerals. Moreover, the relationship between seismology and thermoelectricity of the native semiconductor minerals are discussed. One viewpoint is showed: there are a lot of semiconductor minerals in crust, and much more of them have thermoelectric characteristic. All natural semiconductor minerals can be classified as sensitive and insensitive thermoelectric minerals according to the extent of thermoelectricity occurrence under difference temperature. Because there is an interaction among the same original electric, magnetic, thermal field in seismological process, so that thermoelectric effect of semiconductor minerals can be waken by thermal field, and an interferential electric field is appeared. That means the interferential electric field maybe is premonition information. Also, the thermoelectric potential test results for a few common natural semiconductor minerals showed that thermovoltage absolute value are increased remarkably with active temperature. So, it is very significant that mechanism of abnormal electric field change is discussed based on the thermoelectric effects of natural semiconductor minerals in crust.Accompanying with the increasing of activated temperature, the absolute values of thermoelectricity rise obviously for many semiconductor mineral, and some minerals show very good linear trends. However, following by the activated temperature rising, other minerals’thermovoltage increase and disperse. From the approximate 19,542 data got in testing, mineral grain with 0.18-0.90mm in size can produce a few decades mV thermovoltage when the activated temperature is less than 80℃, and the thermovoltage is repeatable prominently.. Therefore, the thermoelectric effect of semiconductor minerals which are the thermoelectric sensitive would be very helpful and meaningful for the abnormal variation of seismic electric field.Here are the results for the variation of thermoelectricity of magnetite when the activated temperature is less 80℃:(1) The thermovoltage values of magnetite are all negative at different activated temperatures, and the absolute values of them are linear increased with the rising of activated temperature. Magnetite grains in size of 40-60 mesh (0.28mm-0.45mm) can produce 4.5mV thermovoltage in maxium.(2) For the same original magnetite from different mines, the relationships between thermovolatge and activated temperature are quite uniform.(3) Magnetite with different origins have same discipline between thermovolatge and activated temperature.(4) Activated temperature of thermovoltage of Magnetite is not dependent on crystallographic orientation.(5) With the increasing of activated temperature, thermoelectric parameter is getting convergence and close to a specific value -53μV/℃。.