With the addition of sodium atoms the ferroelectric insulator W O3 acquires metallic properties. We have grown single crystals of NaxWO3 using a method developed at the Linde Air Products Company. Chemical analyses for sodium concentration showed x=0.66. The electrical resistivity was found to have a value of (1.9±0.2)× 10−4 ohm-cm at 0°C and to decrease approximately linearly with decreasing temperature in the range 20°C to -160°C. The Hall coefficient was found to have a value of (-5.1±0.2)× 10−4 cm3/coulomb at 20°C and to decrease ...
