DTA/TG, XRD and 27Al MAS NMR of yttrium aluminium garnet, Y3al5o12 by sol-gel synthesis
Azis, Rabaah Syahidah and Holland, Diane and Smith, Mark E. and Howes, Andrew and Hashim, Mansor and Zakaria, Azmi and Hassan, Jumiah and Mohd Saiden, Norlaily and Mohd Zawawi, Mohd Khairul Ikhwan (2013) DTA/TG, XRD and 27Al MAS NMR of yttrium aluminium garnet, Y3al5o12 by sol-gel synthesis. Journal of the Australian Ceramic Society, 49 (2). pp. 74-80. ISSN 0004-881X
27Al magic angle spinning (MAS) NMR has been used at two fields (8.45 T and 14.1 T) to follow the optimisation of a sol-gel process to produce yttrium aluminium garnet, Y3Al5O12 (YAG), at moderate temperatures. 27Al MAS NMR is shown to be a highly sensitive tool to determine the presence of the impurity phase, yttrium aluminium perovskite, YAlO3. Single phase, polycrystalline YAG has been successfully synthesized, using this modified sol-gel process, at temperatures as low as 800◦C. Chemical shifts, quadrupolar coupling constants and asymmetry parameters are reported for the tetrahedral and octahedral aluminium sites of YAG.
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