Abstract
Pb
1.83Mg
0.29Nb
1.71O
6.39 pyrochlore was produced via a simple partial oxalate method. It was examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Single phase, belonging to the cubic pyrochlore structure, with a lattice parameter of
a=10.60125±0.001 Å and grain size that varies from 5 to 10 μm was obtained. The electrical properties were measured at different temperatures in the range 15–320 K without and with applied magnetic field of 1.4 T. Current–voltage characteristics data were fitted to a power law expression
V=
I
β(
T)
in which the exponential parameter
β takes values around 1 at all temperatures except at 300 K. Resistance starts from 3.3×10
10 Ω at 15 K and increases gradually to 4.8×10
10 Ω at 240 K. It drops to approximately 1.2×10
10 Ω at 300 K, after which it increases again to around 1.6×10
10 Ω at 320 K.