Electrical conductivity in mixed-alkali iron phosphate glasses

Abstract The electrical conductivity of mixed-alkali, sodium and potassium, iron phosphate glasses has been studied in the frequency range from 0.1 Hz to 10 kHz and over a temperature range from 303 to 423 K. The dc conductivity of the alkali-free iron phosphate glasses was 5–10 times higher than that of the single- or mixed-alkali iron phosphate glasses containing a total of 20 mol% alkali. The dc conductivity for the mixed-alkali, sodium and potassium, iron phosphate glasses is independent of the Na/K ratio and there is no evidence of any mixed-alkali effect. The sodium and potassium ions have such a low mobility in both single- and mixed-alkali iron phosphate glasses that they make no detectable contribution to the total conductivity that is electronic in origin. The Raman spectra for all the glasses are identical which indicates that the structure of the single- or mixed-alkali glasses are the same.

[1]  D. Day,et al.  Thermally stimulated polarization current technique for measuring the electrical conductivity of vitreous solids , 1979 .

[2]  Nevill Mott,et al.  Conduction in glasses containing transition metal ions , 1968 .

[3]  D. Day.  Mixed alkali glasses — Their properties and uses , 1976 .

[4]  R. Brow,et al.  Relaxations in mixed alkali metaphosphate glass , 1994 .

[5]  Peter F. Green,et al.  Comparison of KWW and power law analyses of an ion-conducting glass , 1995 .

[6]  C. Angell.  Dynamic processes in ionic glasses , 1990 .

[7]  D. Tallant,et al.  Raman investigation of glass structures in the Na2O-SiO2-P2O5-Al2O3 system , 1986 .

[8]  A. Pradel,et al.  A study of the mixed alkali effect by frequency-dependent conductivity in Li2O-Na2O-P2O5 glasses , 1992 .

[9]  A. Bunde,et al.  Mixed alkali effects in ionic conductors: a new model and computer simulations , 1991 .

[10]  A. K. Jonscher,et al.  The ‘universal’ dielectric response , 1977, Nature.

[11]  Darryl P Almond,et al.  The determination of hopping rates and carrier concentrations in ionic conductors by a new analysis of ac conductivity , 1983 .

[12]  Delbert E. Day,et al.  Structural Study of Iron Phosphate Glasses , 1997 .

[13]  A. Bunde,et al.  Diffusion with memory: a model for mixed alkali effects in vitreous ionic conductors , 1991 .

[14]  Graham Williams,et al.  Non-symmetrical dielectric relaxation behaviour arising from a simple empirical decay function , 1970 .

[15]  N. Yoshimura,et al.  Correlation of electrical properties and internal friction in mixed conduction glasses containing ionic and electronic conduction (1) Fe2O3-Na2O-P2O5 glasses , 1989 .

[16]  A. Miotello,et al.  A new model for dielectric relaxation and transport processes in mixed-alkali silicate glasses , 1991 .

[17]  Delbert E. Day,et al.  Thermally stimulated polarization and dc conduction in iron phosphate glasses , 1993 .

[18]  B. Dobson,et al.  A structural basis for ionic diffusion in oxide glasses , 1991 .

[19]  N. Soga,et al.  Temperature dependence of electrical conduction of sodium-iron phosphate glasses , 1982 .

[20]  A. Owens,et al.  The diffusion-controlled relaxation model for ionic transport in glasses , 1989 .

[21]  C. T. Moynihan,et al.  The Dynamics of Mobile Ions in lonically Conducting Glasses and Other Materials , 1998 .

[22]  Leon Murawski,et al.  Electrical conductivity in iron-containing oxide glasses , 1982 .