a Corporate Research Laboratories, Exxon Research and Engineering Company, Linden, New Jersey 07036, USA
b Central Research & Development Department, E. I. duPont deNemours & Co., Wilmington, Delaware 19898, USA
Abstract:
The compound CuTa2O6 has been prepared as crystals from a Cu/O melt and found to be tetragonal (, ) rather than cubic as reported in the literature. The coefficient of thermal expansion between room temperature and 1000°C was found to be 8.0 × 10?6°C?1. Electrical resistivity measurements on a crystal showed semiconductor behavior between room temperature () and 140°K () with an activation energy of EA = 0.2 eV. Magnetic measurements between 4.2°K and room temperature showed Curie-Weiss behavior with a change in μeff at 120°K. For T>120°K, μeff = 1.76μB and θp = 0°K while for T<120°K μeff = 1.91 μB and θp = ?15°K.