Electrical Resistivity of Titanium Diboride and Zirconium Diboride

The electrical resistivities of hot‐pressed samples of Ti 1‐ x Zr x B 2 ( x = 0.0, 0.3, 0.5, 0.7, 1.0) were measured by a four‐point ac technique over the range 298 to 1573 K in an argon atmosphere. The hot‐pressed samples for the intermediate compositions were found to be mixtures of two solid‐solution phases. The resistivities for all compositions were found to increase linearly with temperature and can be described by ρ( T ) =ρ 298 +φ( T ‐ 298). The room‐temperature resistivity ρ298 (μΩ cm) and the temperature coefficient of resistivity φ (nΩ·cm/K) for ZrB 2 were determined to be 7.8 and 10, both of which increase with the content of TiB 2 . These values for TiB 2 were determined to be 20.4 and 36, respectively.