To prevent the migration of Mo described in Section 3.2 into the MoSi2 thin film, heaters using Mo5Si3 or Mo3Si thin film were fabricated. The reason for using Mo5Si3 or Mo3Si thin film is that even if migration of Mo occurs, the composition of the heating area does not change very much. The Mo5Si3 and Mo3Si thin films were deposited using a target which was a mixture of Mo and MoSi2 powders. A high-purity alumina substrate with a thickness of 1.0 mm or a high-purity alumina crucible was used. The sputtering conditions were the same as those for MoSi2, and the discharge time was 2 hours. The thin films were analyzed by XRD and EDX. The conditions of analysis also were the same as for MoSi2. Heaters using these thin films deposited on the crucible were also fabricated under the same conditions as described in Section 2.2. The discharge time of the Mo5Si3 or Mo3Si thin film was 1 hour.