Monoclinic CeNbO4.25 was prepared by solid state reaction. Complex impedance analysis indicated the presence of grain interior effect along with the grain boundary contribution. The values of ionic transference number ti below 423 K were calculated to be about 0.5. The activation energies of ionic conductivity and electronic conductivity were deduced to be 36.0 and 37.2 kJ/mol, re-spectively. The real part of the AC conductivity was frequency dependent. At high frequencies corresponding to the grain interior ef-fect, the non-Debye nature of the AC conductivity was interpreted by the correlated hopping of interstitial oxygen with the electron holes on the basis of the correlated barrier hopping (CBH) model.
参考文献
| [1] | Thompson JG;Brink FJ;Withers RL .MODULATED STRUCTURES IN OXIDIZED CERIUM NIOBATES[J].International Journal of Quantum Chemistry,1999(1):122-131. |
| [2] | Skinner S J;Kang Y .X-ray diffraction studies and phase transformations of CeNbO4+δ using in situ techniques[J].Solid State Sciences,2003,5:1475. |
| [3] | Skinner SJ;Brooks IJE;Munnings CN .Tetragonal CeNbO4 at 1073 K in air and in vacuo[J].Acta Crystallographica. Sect.C, Section C. Crystal Structure Communications,2004(4):I37-I39. |
| [4] | Tsipis EV;Munnings CN;Kharton VV;Skinner SJ;Frade JR .Transport properties and structural stability of tetragonal CeNbO4+delta[J].Solid state ionics,2006(11/12):1015-1020. |
| [5] | Packer RJ;Tsipis EV;Munnings CN;Kharton VV;Skinner SJ;Frade JR .Diffusion and conductivity properties of cerium niobate[J].Solid state ionics,2006(19/25):2059-2064. |
| [6] | Vullum, F;Grande, T .Oxygen stoichiometry and transport properties of cerium niobate[J].Solid state ionics,2008(21/26):1061-1065. |
| [7] | Packer R J;Skinner S J .Remarkable oxide ion conductiv-ity observed at low temperatures in a complex superstruc-tured oxide[J].Advanced Materials,2010,22:1613. |
| [8] | M.Prabu,S.Selvasekarapandian,A.R.Kulkarni,G.Hirankumar,C.Sanjeeviraja.Conductivity and dielectric studies on LiCeO2[J].稀土学报（英文版）,2010(03):435-438. |
| [9] | Nowick AS. .Exploring the low-temperature electrical relaxation of crystalline oxygen-ion and protonic conductors[J].Solid state ionics,2000(Special Issue SI):1307-1314. |
| [10] | Prasad K;Lily;Kumari K;Yadav KL .Hopping type of conduction in (Na0.5Bi0.5)ZrO3 ceramic[J].The journal of physics and chemistry of solids,2007(8):1508-1514. |
| [11] | Jonscher A K .The'universal' dielectric response[J].Nature,1977,267:673. |
| [12] | Macdonald JR. .Some alternate models for nearly constant loss in conductive systems - art. no. 064305[J].Physical Review.B.Condensed Matter,2002(6):4305-0. |
| [13] | Skinner SJ. .CeTaO4+delta (0.06 <=delta <= 0.17) as an interstitial oxide ion conductor[J].Solid state ionics,2002(Pt.B):325-329. |
| [14] | Tsipis E V;Patrakeev M V;Kharton V V;Vyshatko N P, Frade J R .Ionic and p-type electronic transport in zir-con-type Ce1-xAxVO4±δ(A=Ca, Sr)[J].Journal of Materials Chemistry,2002,12:3738. |
| [15] | Diaz-Guillen MR;Moreno KJ;Diaz-Guillen JA;Fuentes AF;Ngai KL;Garcia-Barriocanal J;Santamaria J;Leon C .Cation size effects in oxygen ion dynamics of highly disordered pyrochlore-type ionic conductors[J].Physical review, B. Condensed matter and materials physics,2008(10):104304-1-104304-7-0. |
| [16] | Okutan M;Basaran E;Bakan HI;Yakuphanoglu F .AC conductivity and dielectric properties of Co-doped TiO2[J].Physica, B. Condensed Matter,2005(1/4):300-305. |
| [17] | B SINGH;P S TARSIKKA;L SINGH .Dielectric relaxation and ac conductivity of sodium tungsten phosphate glasses[J].Pramana: Journal of physics,2002(4):653-661. |
| [18] | Seto J Y W .The electrical properties of polycrystalline silicon films[J].Journal of Applied Physics,1975,46:5247. |
| [19] | Elliott S R .Frequency-dependent conductivity in ionically and electronically conducting amorphous solids[J].Solid-State Ionicis,1994,70/71:27. |
| [20] | Elliott S R .A.c. conduction in amorphous chalcogenide and pnictide semiconductors[J].Advances in Physics,1987,36(02):135. |
| [21] | Jung WH.;Iguchi E. .POLARONIC TRANSPORT PROPERTIES IN LA1-XSRXFEO3 SYSTEMS (0.05-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.3)[J].Journal of Physics. Condensed Matter,1995(6):1215-1227. |
| [22] | Takahashi M;Noguchi Y;Miyayama M .Estimation of ionic and hole conductivity in bismuth titanate polycrystals at high temperatures[J].Solid state ionics,2004(1/4):325-329. |
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