Bulletin of materials science | |
Synthesis, microstructure and thermal expansion studies on Ca0.5+ð‘�?/2Sr0.5+ð‘�?/2Zr4P6âˆ�?2ð‘¥Si2ð‘¥O24 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 | |
【 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.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
---|---|---|---|
RO201912010229707ZK.pdf | 633KB | download |