Low temperature sintering behavior of La-Co substituted M-type strontium hexaferrites for use in microwave LTCC technology

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• 作者：Taixing HUANG ((黄太星))^a ; Long PENG ((彭 龙))^a ; ^{penglong@cuit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Lezhong LI ((李乐中))^a ; Rui WANG ((王 瑞))^a ; Yun HU ((胡 云))^a ; Xiaoqiang TU ((涂小强))^a
• 关键词：M-type hexaferrites ; SrFe12O19 ferrites ; La-Co substitution ; low temperature sintering ; LTCC ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：34
• 期：2
• 页码：148-151
• 全文大小：729 K

文摘

The La-Co substituted Sr_1-xLa_xFe_12-xCo_xO₁₉ (x=0-0.5) ferrites with appropriate Bi₂O₃ additive were prepared by conventional sintering method and microwave sintering method at low sintering temperatures compatible with LTCC (low temperature co-fired ceramics) systems, and their sintering behavior was chiefly investigated, including the crystal structure, saturation magnetization M_s, magnetic anisotropy field H_a, intrinsic coercivity H_ci, and Curie temperature T_C. Experiment results clearly showed that the pure M-type crystal phase was successfully obtained when the La-Co substitution amount x did not exceed 0.3. However, the single M-type phase structure transformed to multiphase structure with further increased x, where the M-type phase coexisted with the non-magnetic phase such as α-Fe₂O₃ phase, La₂O₃ phase, and LaCoO₃ phase. Appropriate La-Co substitution improved the M_s (>62 emu/g), H_a (>1400 kA/m), and H_ci (>320 kA/m) for the ferrites with x varying from 0.1 to 0.3, but the T_C decreased with increasing substitution amount. Moreover, the microwave sintered ferrites could provide larger H_ci and similar M_s compared with the conventional sintered ferrites.