Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-27T23:14:19.407Z Has data issue: false hasContentIssue false
  • English
  • Français

Standard Gibbs energy of formation of Pb2Ru2O6.5

Published online by Cambridge University Press:  03 March 2011

K.T. Jacob ,
V.S. Saji  and
Y. Waseda
K.T. Jacob*
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore 560 012, India
V.S. Saji
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore 560 012, India
Y. Waseda
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
*
a) Address all correspondence to this author.e-mail: [email protected]
Get access

Abstract

Lead ruthenate is used as a bifunctional electrocatalyst for both oxygen evolution and reduction and as a conducting component in thick-film resistors. It also has potential applications in supercapacitors and solid oxide fuel cells. However, thermodynamic properties of the compound have not been reported in the literature. The standard Gibbs energy of formation has now been determined in the temperature range from 873 to 1123 K using a solid-state cell incorporating yttria-stabilized zirconia (YSZ) as the electrolyte, a mixture of PbO + Pb2Ru2O6.5 + Ru as the measuring electrode, and Ru + RuO2 as the reference. The design of the measuring electrode is based on a study of phase relations in the ternary system Pb–Ru–O at 1123 K. For the reaction,

the standard enthalpy of formation and standard entropy at 298.15 K are estimated from the high-temperature measurements. An oxygen potential diagram for the system Pb–Ru–O is composed based on data obtained in this study and auxiliary information from the literature

Keywords

Phase equilibria
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1174 - 1181
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Carcia, P.F., Ferretti, A., and Suna, A.: Particle size effects in thick film resistors. J. Appl. Phys. 53, 5282 (1982).CrossRefGoogle Scholar
2Morten, B., Prudenziati, M., Sacchi, M., and Sirotti, F.: Phase transitions in Ru based thick film (cermet) resistors. J. Appl. Phys. 63, 2267 (1988).CrossRefGoogle Scholar
3Horowitz, H.S., Longo, J.M., and Horowitz, H.H.: Oxygen electrocatalysis on some oxide pyrochlores. J. Electrochem. Soc. 130, 1851 (1983).CrossRefGoogle Scholar
4Cao, F. and Prakash, J.: Performance investigation of Pb2Ru2O6.5 oxide based pseudocapacitors. J. Power Source 92, 40 (2001).CrossRefGoogle Scholar
5Takeda, T., Kanno, R., Kawamoto, Y., Takeda, Y., and Yamamoto, O.: New cathode materials for solid oxide fuel cells; Ruthenium pyrochlores and perovskites. J. Electrochem. Soc. 147, 1730 (2000).CrossRefGoogle Scholar
6Bae, J.M. and Steele, B.C.H.: Properties of pyrochlore ruthenate cathodes for intermediate temperature solid oxide fuel cells. J. Electroceram. 3, 37 (1999).CrossRefGoogle Scholar
7Bernstein, S.D., Wong, T.Y., Kisler, Y., and Tustison, R.W.: Fatigue of ferroelectric PbZrxTiyO3 capacitors with Ru and RuO2 electrodes. J. Mater. Res. 8, 12 (1993).CrossRefGoogle Scholar
8Kim, S-H., Hong, J.G., Streiffer, S.K., and Kingon, A.I.: The effect of RuO2/Pt hybrid bottom electrode structure on the leakage and fatigue properties of chemical solution derived Pb(ZrxTi1−x)O3 thin films. J. Mater. Res. 14, 1018 (1999).CrossRefGoogle Scholar
9Benčan, A., Hrovat, M., Holc, J., and Kosec, M.: Interaction between RuO2 and PZT material. J. Eur. Ceram. Soc. 21, 1451 (2001).CrossRefGoogle Scholar
10Shaplygin, I.S., Prosychev, I.I., and Lazarev, V.B.: The PbO–RuO2 system. Russ. J. Inorg. Chem. 34, 300 (1989).Google Scholar
11Longo, J.M., Raccah, P.M., and Goodenough, J.B.: Pb2M2O7−x (M = Ru, Ir, Re)—Preparation and properties of oxygen deficient pyrochlores. Mater. Res. Bull. 4, 191 (1969).CrossRefGoogle Scholar
12Horowitz, H.S., Longo, J.M., and Lewandowski, J.T.: New oxide pyrochlores—A2[B2−xA x]O7−y (A = Pb, Bi; B = Ru, Ir). Mater. Res. Bull. 16, 489 (1981).CrossRefGoogle Scholar
13Akazawa, T., Inaguma, Y., Katsumata, T., Hiraki, K., and Takahashi, T.: Flux growth and physical properties of pyrochlore Pb2Ru2O6.5 single crystals. J. Cryst. Growth 271, 445 (2004).CrossRefGoogle Scholar
14Hrovat, M., Bernik, S., and Kolar, D.: Phase equilibria in the RuO2–PbO–Al2O3 and RuO2–PbO–CuO systems. J. Mater. Sci. Lett. 12, 1848 (1993).CrossRefGoogle Scholar
15Beyerlein, R.A., Horowitz, H.S., Longo, J.M., Leonowicz, M.E., Jorgensen, J.D., and Rotella, F.J.: Neutron diffraction investigation of ordered oxygen vacancies in the defect pyrochlores, Pb2Ru2O6.5 and PbTiNb2O6.5. J. Solid State Chem. 51, 253 (1984).CrossRefGoogle Scholar
16Jacob, K.T., Mishra, S., and Waseda, Y.: Refinement of thermodynamic properties of RuO2 and OsO2. J. Am. Ceram. Soc. 83, 1745 (2000).CrossRefGoogle Scholar
17Rodigina, E.N., Gomel’skii, K.Z., and Luginina, V.F.: Entropy and heat capacity of yellow lead oxide at high temperatures. Russ. J. Phys. Chem. 35, 884 (1961).Google Scholar
18Chase, M.W. Jr., Davies, C.A., Downey, J.R. Jr., Frurip, D.J., McDonald, R.A., and Syverud, A.N.: JANAF Thermochemical Tables, in J. Phys. Chem. Ref. Data, 3rd ed., 14, Supplement No. 1 (American Institute of Physics, New York, 1985).Google Scholar
19Cordfunke, E.H.P., Konings, R.J.M., Westrum, E.F. Jr., and Shaviv, R.: The thermophysical and thermochemical properties of RuO2 from 0 to 1000 K. J. Phys. Chem. Solids 50, 429 (1989).CrossRefGoogle Scholar
20Drowart, J., Colin, R., and Exsteen, G.: Mass spectroscopic study of the vaporization of lead monoxide. Trans. Faraday Soc. 61, 1376 (1965).CrossRefGoogle Scholar