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/2Zr4P6−2x Si2x O24 system prepared by co-precipitation method



We report on the synthesis, microstructure and thermal expansion studies on Ca0·5 + x/2Sr0·5 + x/2Zr4P6 − 2x Si2x O24 (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.


NZP ceramics thermal expansion microcracking co-precipitation 


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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

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