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The formation of spinel NiFe 2 O 4 structure in the calcined nickel ferrite sample is further supported by FT-IR spectrum shown in Fig. nama bo slot terpercaya 2 The bands at 563 cm −1 and 474 cm −1 represented tetrahedral and octahedral modes of NiFe 2 O 4, respectively [14] The band located at 3399 cm −1 can be attributed to the symmetric vibration of –OH