NMR study and electrical properties investigation of Zn2P2O7

摘要: The α-Zn2P2O7 compound was obtained by conventional solid-state reaction. sample characterized X-ray powder diffraction, solid state 31P NMR MAS, and electrical impedance spectroscopy. MAS NMR, performed at 121.49 MHz, shows three isotropic resonances −21.1, −18.8, −15.8 ppm, confirming the non-equivalency of PO4 groups in form. They are different chemical shift tensor parameters with local geometrical features tetrahedra. Electrical measurements β-Zn2P2O7, form stable for temperature greater than 403 K, were as a function both frequency. conduction dielectric relaxation have been studied. AC conductivity obeys universal power law. approximation type correlated barrier hopping model explains behavior n exponent. plane plot semicircle arcs temperatures, an equivalent circuit has proposed to explain results. circuits consist parallel combination bulk resistance R p constant phase elements CPE. simulated spectra show good correlation experimental data.