JMP  Vol.2 No.7 , July 2011
Effect of Glass Composition on the Thermal Expansion of Relict Crystals of RuO2 in Doped Lead-Silicate Glasses (Thick Film Resistors)
ABSTRACT
The thermal expansion coefficients (TEC) of RuO2 crystallits in thick film resistor (TFR) composites, consisting of RuO2 dispersed in lead-silicate glass of various compositions, were evaluated from X-ray diffraction patterns at temperatures 298; 773; 973 and 1123 K corresponding to characteristic temperatures of resistivity and thermopower anomalies of the TFRs. It has been found that TEC of free RuO2 powder along a-axis has an anomaly at T > 973 K (expansion is replaced by constriction), whereas constriction along c-axes remains for all temperatures. This anomaly disappears in doped glass of simplest composition (2SiO2.PbO) but occurs in glasses of some complex compositions. Symmetry of unit cell of RuO2 is not changed in the temperature range investigated.

Cite this paper
nullG. Abdurakhmanov, "Effect of Glass Composition on the Thermal Expansion of Relict Crystals of RuO2 in Doped Lead-Silicate Glasses (Thick Film Resistors)," Journal of Modern Physics, Vol. 2 No. 7, 2011, pp. 651-653. doi: 10.4236/jmp.2011.27076.
References
[1]   Thick Film Sensors. Ed. M. Prudenziati. Elsevier Science. - Amsterdam, 1994.- 482 pp.

[2]   G. E. Pike and C. H. Seager, J. Appl. Phys. 48(12) (1977), 5152.

[3]   K. Flachbart, V. Pavlík, N. Toma ovi ová, C. J. Adkins, M. Somora, J. Leib, G. Eska, Phys. Stat. Solidi (b) 205 (1998), 399.

[4]   B. Morten, M. Prudenziati, M. Sacchi and F. Sirotti, J. Appl. Phys. 83 (1988) 2267.

[5]   K. Adachi and H. Kuno, J. Amer. Ceram. Soc. 80 (5) (1997), pp. 1055-1064.

[6]   K. Adachi, S. Iida, K. Hayashi, J. Mater. Res. 9, # 7, pp. 1866-1878. DOI: 10.1557/JMR.1994. 1866.

[7]   S. Gabani, K. Flachbart, V. Pavlik, A. Pietrikova and M. Gabaniova, Acta Physica Polonica A 113 (2008) No. 1, 625.

[8]   G. Abdurakhmanov, G. S. Vakhidova and N. G. Abdurakhmanova, Phys. St. Solidi (b) 202 (2005), 1799. DOI: 10.1002/pssa.200420036

[9]   K. Rao and L. Iyengar, Acta Cryst. A25 (1969), 302.

[10]   J. M. Fletcher, W. E. Gardner, B. F. Greenfield, M. J. Holdoway and M. H. Rand, J. Chem. Soc. A, 1968, 653.

[11]   Ruthenium Chemistry (Khimiya ruteniya). Ed. O. E. Zvyagintcev. Nauka Publishing House. – Moscow, 1965. –301 p.

[12]   G. Abdurakhmanov and G. S. Vakhidova, Izvestiya Akademii Nauk UzSSR, seriya fiz.-mat. nauk (Reports of the Uzbek Academy of Sciences – phys. and mathem.) № 2, 1989, 83.

[13]   W. Eitel, The Physical Chemistry of the Silicates (The University of Chicago Press, Chicago, 1954). (The Russian translation, Publishing House of Foreign Literature, Moscow, 1962. – 1055 p.).

 
 
Top