Abstract
Abstract x CaTiO 3 –(1− x ) Sr(Mg 1/3 Nb 2/3 )O 3 (CTSMN) and y CaTiO 3 –(1− y ) NdAlO 3 (CTNA) were studied by Raman spectroscopy. A sharp Raman band at 825 cm −1 was observed in SrMg 1/3 Nb 2/3 O 3 , consistent with 1:2 long-range ordering of cations on the B-site. The intensity of this band decreased and its width increased with increasing x implying that the degree of order was reduced. A broad Raman band around 800 cm −1 , absent in both pure CaTiO 3 and NdAlO 3 , was found in CTNA solid solutions with the strongest intensity at x =0.5. The position and intensity of this band suggested that its origin was similar in nature to that observed in CTSMN. The occurrence of a band at ∼800 cm −1 in CTNA suggested a non-random distribution of Ti 4+ and Al 3+ on the B cation sites.
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