Fig. 7


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RDC sintered at 1500–1600 °C for 5 h; sintered at 1000 °C for 10 h; SEM diagram of carbonate composite magnified 5000 times. (Here, (a), (e), (i) have R = La; (b), (f), (j) have R = Sm; (c), (g), (k) have R = Gd; (d), (h), (l) have R = Gd + Y.)

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