Reinvestigation of the Fe-rich part of the pseudo-binary system SrO–Fe2O3

Single Crystal Growth of Strontium Ferrite with Magnetoplumbite Structure Using the Traveling Solvent Floating Zone Method

“…Pseudo-binary equilibrium phase diagram of the SrO -Fe 2 O 3 system, representing an isobaric section in air, was reported by Langhof et al [1]. It is noteworthy that SrFe 12 O 19 coexists with a liquid phase corresponding to a portion of the liquidus curve.…”

High saturation magnetization in La–Ce–Zn–doped M-type Sr-hexaferrites

“…It is understandable that the temperature for the formation of the W-type phase can be lowered when it is formed in a reducing atmosphere of N 2 . In fact, the W-type phase is stable only at temperatures over 1350 1C in air [13]. It is closely related to Fe reduction (from Fe 3 þ to Fe 2 þ ) because the W-type phase should contain Fe 2 þ .…”

“…Analysis by X-ray diffraction (XRD, X'PERT MPD, Philips) with a Cu K α radiation source (λ¼ 0.154056 nm) and field emission scanning electron microscopy (FE-SEM, S-4700, Hitachi) were performed for phase identification and microstructural observation respectively.Magnetic hysteresis curves were measured using a physical property measurement system-vibrating sample magnetometer (PPMS-VSM, Quantum Design) at room temperature (300 K) with a maximum applied field of 5 T. The main peak intensity ratio of the S-phase to the M-phase (I S /I M ) gradually increases from 0.15 to 0.55 as x varies from 0 to 0.3, implying that the relative amount of S-phase increases greatly as x increases in the N 2 -annealed samples. It is remarkable that the M-phase can coexist with the S-phase when they are formed in a reducing atmosphere of N 2 even though the M-phase is not compatible with the S-phase in air according to the phase diagram [13]. It is also understandable that the Ce is not fully soluble in the M-phase when x is over 0.1 regardless of the atmospheres.…”

Synthesis and magnetic characterization of Sr-based Ni2X-type hexaferrite

“…9. X-ray diffraction patterns of (a) W-type (SrZn 2 W), 13 (b) "Sr 2 Ni 2 X", 9 (c) X-type (Sr 2 Fe 2 X), 3,8 (d) "Sr 2 CuMgX", 10 and (e) M-type (SrM). 12 the characterization is incomplete because of the lack of the data at Q < 1.76 Å −1 (2θ < 25 • ).…”