Ceramic heater, ceramic glow plug and method of manufacturing the same

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This invention relate to a sintered ceramic heater, having a heat-generating resistor and a ceramic insulator embedding the resistor therein, wherein the resistor consists essentially of electrically conductive ceramic grains, secondary ceramic grains and a grain boundary phase having the general formula 2E2O3.Si2-xAlxN2-xO1+x, wherein E represents at least one element of rare earth metals and 0