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題名 | 高抗磁力伽瑪型氧化鐵磁性粒體研究 |
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作者 | 鄧明正; 張維德; 金重勳; | 書刊名 | 材料科學 |
卷期 | 26:3 1994.09[民83.09] |
頁次 | 頁206-217 |
分類號 | 440.36 |
關鍵詞 | γ-(Fe、Mn、Co)[feaf]O[feb0]粒體; 抗磁力; 共沈法; 沉澱劑; γ-(Fe, Mn, Co)[feaf]O[feb0]; particle; Coercivity; Coprecipitation precipitant; |
語文 | 中文(Chinese) |
中文摘要 | 本研究採用不同沉澱劑,以共沉法獲致含Co、Mn、Fe之氫氧基沉澱物, 再施予煆燒,還原及氧化,退火等熱處理,製備得γ-(Fe、Mn、Co)�烙�偕洬妦� 體。綜合比較所得粉體的沉澱量、成本、結晶相與磁性質,歸結出三乙基胺為最 有效的沉澱劑。以三乙基胺為沉澱劑,共沉出含鐵、鈷、錳的沉澱物,經適當之 煆燒,還原及氧化等熱處理後,可以製備出等軸狀的γ-(Fe、Mn、Co)�烙�假吇憿A 粒徑分佈為30~8Onm,平均為50nm。飽和磁化量:62.0~72.8emu/g,抗磁力:1150~1940 Oe,角形比:0.60~0.73。鈷的添加是提高γ-(Fe、Mn、Co)�烙�假吇擏傴洃O的主 要因素,同時也能增進其退火效應。錳的添加也其有提高γ-(Fe、Mn、Co)�烙 �假吇擏傴洃O及其退火後提高抗磁力的效果,原因可能為錳離子的存在可幫助鈷 離子的擴散。製得之γ-(Fe、Mn、Co)�烙�假吇撉漣傴洃O溫度係數為-0.35至-0.40/ ℃,比傳統體添加鈷的γ-Fe�烙��(-1.0/℃)要低,而與表面披覆CO的γ-Fe�烙�� (-0.2/℃~-0.5/℃)相近。由SQUID,梅思堡光譜及HREM的分析,推測γ-(Fe、Mn、 Co)�烙�假吇�(Co 12wt,Mn 14.4wt)。 |
英文摘要 | In this study, γ-(Fe, Mn, Co)�烙�� magnetic particles were prepared by coprecipitation from severalcoprecipitants and heat treatment. In comparison with the amount of precipitation, cost, phases, and magnetic properties, it could be concluded that triethylamine is the best coprecipitant. The particlesprepared by coprecipitation from triethylamine then clacination, reduction and oxidation heat treatment, showed the equiaxed shape with an average size of 50 nm within the range of 30 to 80 nm. Particleswith a satuation magnetization of 62.0 to 72.8 emu/g, a coercivity of 1150 to 1940 Oe and a squarenessratio of 0.60 to 0.73 could be obtained. The doping of Co dominates the increment of coercivity andannealing effect. The doping of Mn also enhances their coercivity and annealing effect, and whichmaybe arisen from easier diffusion of colbalt ions with the assistant of manganese ions. The temperaturecoefficient of coercivity of γ-(Fe, Mn, Co)�烙�� particles is -0.35 to -0.40 /℃. These values are lower than those of body-doped Co-γ-Fe�烙- particles (-1.0 /℃) and within the range of surface coated Co-γ-Fe�烙�� particles (-0.20 to -0.50 /℃). |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。