Systematic microstructural development with thermal diffusivity behaviour from nanometric to micronic grains of strontium titanate

• Main Authors: Idza Riati, Ibrahim, Mansor, Hashim, Ismayadi, Ismail, Khamirul Amin, Matori, Raba’ah Syahidah, Azis, Rodziah, Nazlan, Nor Hapishah, Abdullah, Wan Norailiana, Wan Ab Rahman, Fadzidah, Mohd Idris, Norni Hidayawati, Mat Daud
• Format: Article
• Language: English
• Published: Springer 2018
• Subjects: QC Physics
• Online Access: http://umpir.ump.edu.my/id/eprint/23556/7/Systematic%20microstructural%20development1.pdf; http://umpir.ump.edu.my/id/eprint/23556/; https://doi.org/10.1007/s10973-018-7954-8; https://doi.org/10.1007/s10973-018-7954-8

Strontium titanate is a promising candidate for applications in thermoelectric, thermal management applications, and modern electronic devices because of its desirable thermal stability, chemical stability, and semiconducting behaviour. However, the absence of its important systematic development, having grain size from several nanometric up to micronic size with evolving thermal diffusivity behaviour, triggers the need for filling up the vacuum. Two different heat treatments have been carried out onto the samples which were with presintering and without presintering. Nanometer-sized compacted powder samples were sintered from 500 to 1400C using 100C increments. The parallel characterizations of structural, microstructural and thermal diffusivity properties were systematically carried out. Interestingly, three significant valuedifferentiated groups: weak, moderate, and strong thermal diffusivity were observed, resulting from the influence of different phonon-scattering mechanisms through a systematic development of microstructural properties for both heat treatments.