Synthesis, microstructure and thermal expansion studies on Ca0.5+�?/2Sr0.5+�?/2Zr4P6�?2𝑥Si2𝑥O24 system prepared by co-precipitation method

Bulletin of materials science

A M Umarji²  Basavaraj Angadi³  M R Ajith¹ 

[1] Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Vikram Sarabhai Space Centre, Trivandrum 695 022, India$$Materials Research Centre, Indian Institute of Science, Bangalore 560 012, IndiaMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Vikram Sarabhai Space Centre, Trivandrum 695 022, India$$Vikram Sarabhai Space Centre, Trivandrum 695 022, IndiaMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Vikram Sarabhai Space Centre, Trivandrum 695 022, India$$;Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Materials Research Centre, Indian Institute of Science, Bangalore 560 012, IndiaMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$;Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Department of Physics, Bangalore University, Bangalore 560 056, India$$Materials Research Centre, Indian Institute of Science, Bangalore 560 012, IndiaMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Department of Physics, Bangalore University, Bangalore 560 056, India$$Department of Physics, Bangalore University, Bangalore 560 056, IndiaMaterials Research Centre, Indian Institute of Science, Bangalore 560 012, India$$Department of Physics, Bangalore University, Bangalore 560 056, India$$

关键词: NZP ceramics;    thermal expansion;    microcracking;    co-precipitation.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

We report on the synthesis, microstructure and thermal expansion studies on Ca_{0.5+ð‘�?/2}Sr_{0.5+ð‘�?/2}Zr₄P_{6âˆ�?2ð‘�?}Si_2ð‘�?O₂₄ (ð‘�? = 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 ð‘�? = 0.37. For ð‘�? â‰�? 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 ð‘�? = 0.75. The amount of hysteresis between heating and cooling curves increases progressively from ð‘�? = 0.00 to 0.37 and then decreases for ð‘�? â‰�? 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.

【 授权许可】

Unknown