Table 1.

The solubility limits of the rare earth elements in nickel–zinc ferrite compounds in many previous research papers in compared with this study

Ni–Zn–RE ferrites	Synthesis method	Sintering temperature (°C)	Solubility limit	References
Ni0.5Zn0.5YbxGdxFe2−xO4	Sol–gel	700	0.04	[26]
Ni0.5Zn0.5Fe2−xSmxO4	Combustion	480	0.1	[31]
Ni0.65Zn0.35NdxFe2−xO4	Coprecipitation	800	0.075	[28]
Ni0.5Zn0.5Fe2−xNdxO4	Combustion	1100	0.04	[51]
Ni0.5Zn0.5Fe2−xCexO4	Combustion	800	0.02	[40]
Ni0.55Zn0.45Fe2−xCexO4	Coprecipitation	1200	0.066	This study