| abstract |
【Task】 Provided are a ceramic sintered body having excellent thermal conductivity and high rigidity, a circuit board that is not easily cracked, a highly reliable electronic device, and a highly reliable thermoelectric conversion module. The main crystal phase is mainly composed of silicon nitride, the grain boundary phase is composed mainly of magnesium oxide and a rare earth oxide, and the composition formula is represented by REMgSi 2 O 5 N (RE is a rare earth metal). The ceramic sintered body having excellent thermal conductivity and high rigidity can be obtained. Moreover, if this sintered body is used for a circuit board, it is possible to obtain a highly reliable circuit board in which cracks are unlikely to occur, and an electronic device and a thermoelectric conversion module using this circuit board have high reliability. be able to. [Selection] Figure 1 |