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Yujie Yang,Xiansong Liu,Shuangjiu Feng,Qingrong Lv,Xucai Kan,Ruiwei Zhu 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3
Praseodymium substituted strontium W-type hexaferrites Sr1-xPrxZn0.8Co1.2Fe16O27 (0.00 ≤ x ≤ 0.40) were prepared via theconventional ceramic technique. XRD analysis of W-type hexaferrites with Pr content (x) of 0.00 ≤ x ≤ 0.24 shows the single Wtypehexaferrite phase. However, for the W-type hexaferrites with Pr content (x) ≥ 0.32, the impurity phase (α-Fe2O3) is detected. FE-SEM images show that the grains are platelet-like shapes. The saturation magnetization (Ms), remanent magnetization (Mr)and magneton number (nB) first increase with Pr content (x) from 0.00 to 0.16, and then decrease when Pr content (x) ≥ 0.16. The Mr/Ms ratio, magnetic anisotropy field (Ha), coercivity (Hc) and maximum energy product [(BH)max] increase with Pr content(x) from 0.00 to 0.40. While the first anisotropy constant (K1) increases with Pr content (x) from 0.00 to 0.16, and then decreaseswhen Pr content (x) ≥ 0.16. The DC electrical resistivity (ρ) decreases with Pr content (x) from 0.00 to 0.40.
Yujie Yang,Xiansong Liu,Shuangjiu Feng,Xucai Kan,Qingrong Lv,Feng Hu,Jiangli Ni,Chaocheng Liu,Wei Wang 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.4
The microstructural, spectral, magnetic and electric properties of hexaferrites Ba0.40Sr0.60-xNdxFe12.00-xZnxO19 (0.00 ≤ x ≤ 0.30)synthesized by the solid-state reaction route have been studied. XRD results confirmed that the hexaferrites with Nd-Zncontent (x) of 0.00 ≤ x ≤ 0.24 were single M-type phase, and the hexaferrite with x = 0.30 exhibited the M-type phase andimpurity phase. The remanence (Br) increased with x from 0.00 to 0.06, and then decreased when x ≥ 0.06. The intrinsiccoercivity (Hcj) and magnetic induction coercivity (Hcb) decreased with x from 0.00 to 0.30. Br indicated a linear decreasingbehavior with increasing temperature from 20 oC to 140 oC. Hcj raised linearly with increasing temperature from 20 oC to 140oC. The value of aBr basically remained constant with Nd-Zn content (x). The value of aHcj increased with x from 0.00 to 0.12,and began to decrease when x ≥ 0.12. The electrical resitivity (ρ) presented a decreasing trend with x from 0.00 to 0.30.