FTIR and Electrical Study of Dysprosium Doped Cobalt Ferrite Nanoparticles

Table 5

Dielectric loss tangent (tan𝛿) of CoFe_2−𝑥Dy_𝑥O₄ (𝑥=0.00, 0.05, 0.10 and 0.15) at different sintering temperatures.

Samples	Frequency	Dielectric tangent loss (tan𝛿) at different sintering temperatures
		300°C	500°C	700°C	900°C
𝑥=0.00	75 kHz	0.037	0.045	0.034	0.028
	1 MHz	0.005	0.158	0.151	0.159
	5 MHz	0.001	0.072	0.067	0.118
𝑥=0.05	75 kHz	0.010	1.79	0.0005	0.0002
	1 MHz	0.001	0.253	0.0002	0.0001
	5 MHz	0.001	0.0136	0.0001	0.001
𝑥=0.10	75 kHz	2.006	0.195	0.041	0.0009
	1 MHz	0.343	0.022	0.00481	0.0007
	5 MHz	0.073	0.005	0.003	0.0006
𝑥=0.15	75 kHz	1.644	0.159	0.051	0.0395
	1 MHz	0.222	0.026	0.00481	0.00456
	5 MHz	0.142	0.001	0.003	0.0107