期刊论文详细信息
Bulletin of materials science
Synthesis, microstructure and thermal expansion studies on Ca0.5+�?/2Sr0.5+�?/2Zr4P6�?2𝑥Si2𝑥O24 system prepared by co-precipitation method
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
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【 摘 要 】

We report on the synthesis, microstructure and thermal expansion studies on Ca0.5+�?/2Sr0.5+�?/2Zr4P6�?2�?Si2�?O24 (�? = 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 �? = 0.37. For �? �? 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 �? = 0.75. The amount of hysteresis between heating and cooling curves increases progressively from �? = 0.00 to 0.37 and then decreases for �? �? 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.

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