Bulletin of Materials Science

, Volume 36, Issue 1, pp 87–91 | Cite as

Synthesis, microstructure and thermal expansion studies on Ca0·5+x/2Sr0·5+x/2Zr4P6−2xSi2xO24 system prepared by co-precipitation method

Article

Abstract

We report on the synthesis, microstructure and thermal expansion studies on Ca0·5 + x/2Sr0·5 + x/2Zr4P6 − 2xSi2xO24 (x = 0·00 to 1·00) system which belongs to NZP family of low thermal expansion ceramics. The ceramics synthesized by co-precipitation method at lower calcination and the sintering temperatures were in pure NZP phase up to x = 0·37. For x ≥ 0·5, in addition to NZP phase, ZrSiO4 and Ca2P2O7 form as secondary phases after sintering. The bulk thermal expansion behaviour of the members of this system was studied from 30 to 850 °C. The thermal expansion coefficient increases from a negative value to a positive value with the silicon substitution in place of phosphorous and a near zero thermal expansion was observed at x = 0·75. The amount of hysteresis between heating and cooling curves increases progressively from x = 0·00 to 0·37 and then decreases for x > 0·37. The results were analysed on the basis of formation of the silicon based glassy phase and increase in thermal expansion anisotropy with silicon substitution.

Keywords

NZP ceramics thermal expansion microcracking co-precipitation 

References

  1. Angadi B, Jali V M, Lagare M T, Kini N S and Umarji A M 2002 Bull. Mater. Sci. 25 191CrossRefGoogle Scholar
  2. Boilot J P, Salanie J P, Desplanches D and Le Ptier D 1979 Mater. Res. Bull. 14 1469CrossRefGoogle Scholar
  3. Breval E and Agrawal D K 1995 Bri. Ceram. Trans. 94 27Google Scholar
  4. Breval E, McKinstry H A and Agrawal D K 1998 J. Am. Ceram. Soc. 81 926CrossRefGoogle Scholar
  5. Charkraborty N, Basu D and Fischer W 2005 J. Eur. Ceram. Soc. 25 1885CrossRefGoogle Scholar
  6. Goodenough J B, Hong H Y-P and kafalas J A 1976 Mater. Res. Bull. 11 203CrossRefGoogle Scholar
  7. Limaye S Y, Agrawal D K, Roy R and Mehrotra Y 1991 J. Mater. Sci. 26 93CrossRefGoogle Scholar
  8. Petkov V I and Orlova A I 2003 Inorg. Mater. 39 1013CrossRefGoogle Scholar
  9. Rega D A, Agrawal D K, Huang C-Y and McKinstry H A 1992 J. Mater. Sci. 27 2406CrossRefGoogle Scholar
  10. Roy R, Agrawal D K and McKinstry H A 1989 Annu. Rev. Mater. Sci. 19 59CrossRefGoogle Scholar
  11. Srikanth V, Subbarao E C, Agrawal D K, Huang C-Y, Roy R and Rao G V 1991 J. Am. Ceram. Soc. 74 365CrossRefGoogle Scholar
  12. Umarji A M, Senbhagaraman S and Rao M V R 1997 J. Instr. Soc. India 27 109Google Scholar
  13. Yamai I and Ota T 1993 J. Am. Ceram. Soc. 76 487CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 2013

Authors and Affiliations

  1. 1.Materials Research CentreIndian Institute of ScienceBangaloreIndia
  2. 2.Department of PhysicsBangalore UniversityBangaloreIndia
  3. 3.Vikram Sarabhai Space CentreTrivandrumIndia

Personalised recommendations