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The effects of TEOS on the microstructure and phase evolutions of YAG phase by formation of alumina/yttria core‐shell structures
Author(s) -
Kafili Golara,
LoghmanEstarki Mohammad Reza,
Milani Mostafa,
Movahedi Behrooz
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14966
Subject(s) - dispersant , tetraethyl orthosilicate , materials science , yttrium , yttria stabilized zirconia , chemical engineering , phase (matter) , microstructure , sintering , precipitation , dispersion (optics) , oxide , composite material , nanotechnology , ceramic , cubic zirconia , metallurgy , organic chemistry , chemistry , physics , engineering , optics , meteorology
In this work, pure yttrium aluminum garnet was obtained by the partial chemical method at the low temperature. In this approach, alpha‐alumina nanoparticle, yttrium nitrate, urea, and tetraethyl orthosilicate ( TEOS ) were used as Al 3+ , Y 3+ , precipitation agent, and both dispersant and phase formation assistant agents, respectively. The results showed that TEOS molecules as a dispersant agent caused the less agglomeration of the alumina‐yttria core‐shell structure with a diameter of 200‐300 nm, as compared to particles obtained without using TEOS molecules. Furthermore, by using 0.5 and 1 wt% of TEOS , the YAG formation temperature was decreased from 1400°C to 1200°C through the liquid‐phase diffusion mechanism. Thus, in this case, the TEOS molecules acted as phase formation assistant agent for the constitution of YAG phases.