Zhang Electronegativity Correlates with Ionic Conductivities

Y. Zhang ionocovalent theory applications (21)

 Yonghe Zhang

American Huilin Institute  http://www.amhuilin.com/

 

Wang and Greenblatt proposeted10: “Our objective here was to study the effect of substitution on the K+-framework-oxygen bonds strength and its effect on the ionic conductivity. Since SbV is more electronegative than TiIV (Table I), one expects the Sb-O bond to be more covalent (less ionic) than the Ti-O bond. Consequently.the K+-oxygen bond in K-O-Ti should be stronger than in K-O-Sb. Thus the electronegativity factor is expected to decrease the ionic conductivity in the Ti-substituted K5Sb5P2O20 phase. On the basis of similar reasoning, the ionic conductivity is expected to increase in the Mo/W-substituted phases, because the electronegativity of the MoVI/WVI ions is greater than that of SbV.”

 

  Table 1.Effective Ionic Radii and Electronegativies of Relevant Ions

Iona 

R11, Å

Zhang Electronegativity X12 

SbV

0.74

1.763

TiIV

0.75

1.577

MoVI

0.73

2.025

WVI

0.74

2.132

a: CN 6

 

[10]. B.Wang and M. Greenblatt,Chem. Mater., 1992, 4, 657-661

[11]. Shannon, R. D. Acta Crystallogr. 1976, A32, 751. 

[12]. Y. Zhang, Inorg. Chem., 21(1982) 3886

        Y. Zhang,, in "Introduction to Modern Inorganic Chemistry" ( Eds: K. M. Mackay, R. A. Mackay, W.Henderson, ) 6th ed., Nelson Thornes, United Kingdom,2002, pp 53-54). 

 

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