TY - JOUR
T1 - A study of the magnetic properties of hydrothermally synthesised Sr hexaferrite with Sm substitution
AU - Wang, Jianfeng
AU - Ponton, Clive
AU - Harris, Ivor
PY - 2001/9/1
Y1 - 2001/9/1
N2 - Sm doped Sr hexaferrite particles were synthesised hydrothermally. Post-synthesised calcination with the aim of improving the magnetic properties of as-synthesised particles was conducted at temperatures ranging from 900 degreesC to 1150 degreesC for 2h in air. The effects of the Sm/Sr ratio and the calcination temperature on the crystallography, particle morphology and magnetic properties of Sm doped Sr hexaferrite were investigated by an X-ray diffractometer, scanning electron microscope and vibrating sample magnetometer. It was found that, unlike transition metal element substitution, Sm substitution does not decrease the hexaferrite particle size. The intrinsic coercivities of Sm doped Sr hexaferrite are significantly higher than those of Sr hexaferrite. It has been observed that Sm substitution can increase the intrinsic coercivity of Sr hexaferrite without causing any deterioration of the saturation magnetisation and remanence. In the Sm/Sr range 1/8-1/2 inclusively, there is little change in the coercivity but a slight fall in both the magnetisation and the remanence. (C) 2001 Published by Elsevier Science B.V.
AB - Sm doped Sr hexaferrite particles were synthesised hydrothermally. Post-synthesised calcination with the aim of improving the magnetic properties of as-synthesised particles was conducted at temperatures ranging from 900 degreesC to 1150 degreesC for 2h in air. The effects of the Sm/Sr ratio and the calcination temperature on the crystallography, particle morphology and magnetic properties of Sm doped Sr hexaferrite were investigated by an X-ray diffractometer, scanning electron microscope and vibrating sample magnetometer. It was found that, unlike transition metal element substitution, Sm substitution does not decrease the hexaferrite particle size. The intrinsic coercivities of Sm doped Sr hexaferrite are significantly higher than those of Sr hexaferrite. It has been observed that Sm substitution can increase the intrinsic coercivity of Sr hexaferrite without causing any deterioration of the saturation magnetisation and remanence. In the Sm/Sr range 1/8-1/2 inclusively, there is little change in the coercivity but a slight fall in both the magnetisation and the remanence. (C) 2001 Published by Elsevier Science B.V.
KW - Sm substitution
KW - hydrothermal synthesis
KW - Sr hexaferrite
KW - magnetic properties
UR - http://www.scopus.com/inward/record.url?scp=0035451046&partnerID=8YFLogxK
U2 - 10.1016/S0304-8853(01)00366-3
DO - 10.1016/S0304-8853(01)00366-3
M3 - Article
VL - 234
SP - 233
EP - 240
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
IS - 2
ER -