Investigation of magnetic phase transitions in Ni0.5Cu0.25Zn0.25Fe2-La O4 nanoferrites using magnetic and in-situ ultrasonic measurements

Microstructure, magnetic, and power loss characteristics of low‐sintered NiCuZn ferrites with La2O3‐Bi2O3 additives

“…It is suggested that a small amount of La 3+ ions entered the lattice after addition and replaced Fe 3+ ions, resulting in the increase of the lattice constant. The substitution of La 3+ for Fe 3+ has also been reported in previous studies 19,20 …”

“…This is due to the larger ionic radius of La 3+ (1.016 Å) than Fe 3+ (0.645 Å) 15 . La 3+ in the spinel ferrite is more inclined to occupy the B‐site (i.e., octahedral site, as shown in Figure 2), and La 3+ and Fe 3+ ions are of the same valence in the sample 19 . It is suggested that a small amount of La 3+ ions entered the lattice after addition and replaced Fe 3+ ions, resulting in the increase of the lattice constant.…”

“…Furthermore, according to the microstructure and crystal structure analyses, some of the added La 3+ ions have entered the lattice. Science La 3+ ions give preference to the octahedral sites; the magnetic moments of the B sites will be reduced after the original Fe 3+ ions are replaced by the nonmagnetic La 3+ ions 19 . Thus, the molecular magnetic moment $$| {{M_B} - {M_A}} |$$ of the ferrite decreased, so did $${B_s}$$ 26 …”

“…15 La 3+ in the spinel ferrite is more inclined to occupy the B-site (i.e., octahedral site, as shown in Figure 2), and La 3+ and Fe 3+ ions are of the same valence in the sample. 19 It is suggested that a small amount of La 3+ ions entered the lattice after addition and replaced Fe 3+ ions, resulting in the increase of the lattice constant. The substitution of La 3+ for Fe 3+ has also been reported in previous studies.…”

“…The substitution of La 3+ for Fe 3+ has also been reported in previous studies. 19,20 F I G U R E 1 (A) X-ray diffraction (XRD) patterns of NiCuZn ferrites with different La 2 O 3 addition contents and (B) refinement plot of the sample at x = 0.15 wt%.…”