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An Investigation into the Optoelectrical Properties of the Composite of Aluminum Titanate (Al₂TiO₅)

Omrani, Radman | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58525 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Madaah Hosseini, Hamid Reza; Shabani, Shaghayegh
  7. Abstract:
  8. Aluminum titanate, also known as tialite (Al2TiO5), has traditionally been used in refractory industries due to its unique thermal properties such as its unique coefficient of thermal expansion and stability at high temperatures. However, its anisotropic crystal structure and its capacity to introduce lattice defects such as oxygen vacancies have made this material an emerging option in the fields of optoelectronics and semiconductors. In this study, the Al2TiO5/Al2O3/TiO2 composite was synthesized using a spark plasma sintering method at a temperature of 1773 K. Optical analyses using reflectance and photoluminescence spectroscopy showed that the energy gap of the synthesized sample was reduced by about 2.2 eV. X-ray photoelectron spectroscopy and vibrating sample magnetometry studies also indicated the widespread presence of oxygen vacancies as the main factor reducing the energy gap. In order to use this structure in powder applications such as photocatalysts and solar cells, dense samples obtained from spark plasma sintering were converted into powder by four different milling methods including ball milling, planetary milling, high-energy vibration milling (SPEX model) and cryomilling. The results showed that among the various milling methods, cryomilling method is able to produce powder particles with an average size of about 190 nm without serious damage to the electronic and phase structure. Also, in other milling methods, especially under high energy conditions, signs of decomposition of the tialite structure and return to the initial phases (Al2O3 and TiO2) were observed. Overall, this research shows that the simultaneous use of spark plasma sintering technology for optoelectrical property engineering and cryomilling method for powder preparation is an effective strategy for the development of semiconducting oxide composites for novel optoelectronic applications
  9. Keywords:
  10. Titanium Oxide ; Aluminum Oxides ; Aluminum Titanate ; Tialite ; Spark Plasma Sintering ; Oxygen Vacancy ; Composite ; Oxygen Vacancies

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