To study the physical origin of the non-ohmic behavior of WO_3 ceramics.the effects of heat treatment in different atmospheres on WO_3 varistors were investigated.Experiments showed that there was a dependence of the nonlinear coefficient on thermal treatment under different atmospheres.Thermal treatments in argon and oxygen atmospheres at 900℃ proved this dependence,and indicated that the nonlinear coefficient got significantly lower when the samples were thermally treated under argon atmosphere.Subsequent exposure to oxygen atmosphere at the same temperature led to the restoration of electrical properties.The result shows that the physical origin of the non-ohmic behavior of WO_3 ceramics is oxygen on the grain surfaces adsorbed by intrinsic defects.
参考文献
| [1] | Frosch C J.Improved silicon carbide varistors.Bell Lab Rec,1954,32:336 |
| [2] | Dienel H F.Silicon carbide varistors.Bell Lab Rec,1956,34:407 |
| [3] | Eda K.Zinc oxide varistors.Electrical Insulation Magazine,1989,5:28 |
| [4] | Zang G Z,Wang J F,Chen H C,et al.Effect of Na on the electrical properties of ZnO based varistors.Electron Compon & Mater,2009,22:17 |
| [5] | Matsuoka M,Masuyama T,Iida Y.Voltage nonlinearity of zinc oxide ceramics doped with alkali earth metal oxide.Jpn J Appl Phys,1969,8:1275 |
| [6] | Chen H C,Wang J F,Zang G Z,et al.Electrical properties of (Nb,Mg,Al)-doped ZnO based varistor.Electron Comport Mater,2004,23:27 |
| [7] | Pianaro S A,Bueno P R,Longo E.A new SnO_2-based varistor system.J Mater Sci Lett,1995,14:692 |
| [8] | Matsuoka M.Nonohmic properties of zinc oxide ceramics.Jpn J Appl Phys,1971,10:736 |
| [9] | Selim F A,Gupta T K,Hower P L,et al.Low voltage ZnO varistor:device process and defect model.J Appl Phys,1980,51:765 |
| [10] | Makarov V,Trontelj M.Novel varistor material based on tungsten oxide.J Mater Sci Lett,1994,13:937 |
| [11] | Mahan G D,Levinson L M,Philipp H R,et al.Theory of conduction in ZnO-varistors.J Appl Phys,1979,50:2799 |
| [12] | Pike G E,Leamy H J,Seager C H.Electronic properties of ZnO varistors.Amsterdam:North-Holland,1982 |
| [13] | Bernasconi J,Knecht H P,Knecht B,et al.Investigation of various models for metal oxide varistors.J Electron Mater,1976,5:473 |
| [14] | Bernasconi J,Strassler S,Knecht B.Zinc oxide based varistors:a possible mechanism.Solid Slate Commun,1977,21:867 |
| [15] | Einzinger R.Metal oxide varistor action-a homojunction breakdown mechanism.Appl Surf Sci,1978,1:329 |
| [16] | Zhao M,Wang W M,Zhang C S,et al.Present development of low-voltage ZnO varistor ceramics.J Mater Sci Eng,2005,23:915 |
| [17] | Magnusson K O,Wiklund S.Interface formation of Bi on ceramic ZnO:a simple model varistor grain boundary.J Appl Phys,1994,76:7405 |
| [18] | Nahm C W.Effect of sintering time on varistor properties of Dy2O3-doped ZnO-Pr6O11-based ceramics.Mater Lett,2004,58:3297 |
| [19] | Orlandi M O,Bomio M R D,Longo E.Nonohmic behavior of sno-mno polycrystalline ceramics.II.analysis of admittance and dielectric spectroscopy.J Appl Phys,2004,96:3811 |
| [20] | Clarke D R.Varistor ceramics.J Am Ceram Soc,1999,82:485 |
| [21] | Gupta T K.Application of zinc oxide varistors.J Am Ceram Soc,1990,73:1817 |
| [22] | Verges M A,West A R.Impedance and modulus spectroscopy of ZnO varostors.J Electroceram,1997,1:125 |
| [23] | Smith A,Baumard J F,Abelard P,et al.Ac impedance measurements and V-I characteristics for Co-,Mn-,or Bi-doped ZnO.J Appl Phys,1989,65:5119 |
| [24] | Santos M R C,Bueno P R,Longo E,et al.Effect of oxidizing and reducing atmosphere on the electrical properties of dense SnO_2-based varistors.J Eur Ceram Soc,2001,21:161 |
| [25] | Pianaro S A,Bueno P R,Olivi P.Effect of Bi_2O_3 addition on the microstructure and electrical properties of the SnO_2·CoO·Nb_2O_5 varistor system.J Mater Sci Lett,1997,16:634 |
| [26] | Salje E.Lattice dynamics of WO_3.Acta Crystallographica Section A,1975,31:360 |
| [27] | Hua Z Q,Zhao H W,Li T Y,et al.The origin of varistor property of WO_3 ceramic.(To be published) |
| [28] | Shen P W,Che Y X.Inorganic chemistry series eight.Beijing:Science Press,1998 |
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