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標題: Fabrication and AC susceptibility of La(Fe11.8Si1.2)13 material
La(Fe11.8Si1.2)13 材料製作與交流磁化率研究
作者: Yung-Chen Lu
關鍵字: 無;no
引用: ﹝1﹞顧洋,〝全球暖化的因應〞,科學發展,354 期,2002 年6 月。 ﹝2﹞Gscheidner K A Jr , Pecharsky V K , Pecharsky A O , et al . Recent development in magnetic refrigeration[R] . Materials Science Torum 315 ,TrasTechPubl ,1999 :69~76. ﹝3﹞馬建波,湛永鐘,周衛平,黃國瑞,劉佑良,林栽漢. 磁熱效應和室溫稀土磁製冷材料研究現狀. 材料導報 2008年11月第22卷第11期 ﹝4﹞ Virgil Provenzano*, Alexander J. Shapiro* & Robert D. Shull*, Reduction of hysteresis losses in the magnetic refrigerant Gd5 Ge2 Si2 by the addition of iron, Nature 429, 853–857 (2004) ﹝5﹞杜怡君,翁乙壬,蘇儀帆,〝磁性基本特性及磁性材料應用〞,國立 台灣大學化學系【cited available from: ﹝6﹞變頻磁導分析儀XacQuan 磁量生技公司 操作手冊。 ﹝7﹞胡鳳霞,沈保根,孫繼榮,等.LaFe11.2Co0.7Si1.1 合金在室溫區的巨大磁熵變物理,2002,31(3):139 ﹝8﹞吳忠旺,徐來自,黃焦宏,等.磁熱效應及磁製冷材料的選擇依 據.2007,28(4):90 ﹝9﹞A. Fujita,S. Fujieda, and K. Fukamichi, Itinerant-electron metamagnetic transition and large magnetovolume effects in La(FexSi1-x)13 compounds, Physical review B, VOL. 65, 014410,2001 ﹝10﹞'材料電子顯微鏡學',陳力俊等,全華,頁293‐303,民96.03。 ﹝11﹞'材料分析',汪建民主編,中國材料科學學會,2001。 ﹝12﹞'SEM/EDS的原理與操作應用之簡介',何政恩、高振宏,化工技術 119期,頁102‐115,民92.03。 ﹝13﹞'X光繞射原理及其應用',林麗娟,工業材料86期,頁100‐109,民 83.02 ﹝14﹞'X光繞射應用簡介',鄭信民、林麗娟,工業材料181期,頁100‐108,民91.01 ﹝15﹞L. F. Bao, F. X. Hu) L. Chen, J. Wang, J. R. Sun, and B. G. Shen, Magnetocaloric properties of La(Fe,Si)13-based material and its hydride prepared by industrial mischmetal, Applied physics PPLIED PHYSICS LETTERS 101, 162406 (2012) ﹝16﹞ Xiang CHEN , Yungui CHEN and Yongbo TANG, Studies of short-time and high-temperature annealing and magnetic property of LaFe11.4Si1.6 compound, Acta Metall. Sin.(Engl. Lett.)Vol.24 No.5 pp390-398 2011 ﹝17﹞Xiang Chen , YunguiChen , YongboTang , The influence of different cooling processes on phase,microstructure, and magnetocaloric properties of LaFe11.6Si1.4 compounds,Solid StateCommunications186(2014)56–63 ﹝18﹞H. N. Bez , C. S. Teixeira , B. G. F. Eggert , J.A. Lozano , M. S. Capovilla , J. R. Barbosa, Jr. , and P. A. P. Wendhausen, Synthesis of Room-Temperature Magnetic Refrigerants Based on La-Fe-Si by a Novel Process, IEEE Transactions on magnetics,VOL. 49, NO. 8, 2013 ﹝19﹞S. Fujieda, A. Fujita, K. Fukamichi, N. Hirano, S. Nagaya, Large magnetocaloric effects enhanced by partial substitution of Ce for La in La(Fe0.88Si0.12)13 compound, Journal of Alloys and Compounds 408–412 (2006) ﹝20﹞ S. Mican,R.Tetean, Magnetic properties and magnetocaloric effect in La0.7Nd0.3Fe13-xSix compounds ﹝21﹞陳怡,申江,NaZn13型鐵基化合物的結構和熱力學性質研究,物理學 報,第28卷,2009 ﹝22﹞Q.Y. Dong, H.W.Zhang, J.Chen, J.Shen, J.R.Sun, B.G.Shen, Refrigerant capacity and utilization ratio in NaZn13-type La–Fe–Si compounds, Journal of Magnetism and Magnetic Materials 331 (2013) 183–186 ﹝23﹞A. Fujit and H. Yako, Stability of metallic, magnetic and electronic states in NaZn13-type La(FexSi1-x)13 magnetocaloric compounds, Scripta Materialia 67 (2012) 578–583 ﹝24﹞M. Balanda, AC Susceptibility Studies of Phase Transitions and Magnetic Relaxation:Conventional, Molecular and Low-Dimensional Magnets, Acta physica polonica No. 6 Vol. 124 (2013) ﹝25﹞Introduction AC susceptibility, Quantum Design ﹝26﹞孔令文著,〝Pr2CuAl3 金屬奈米微粒之製作探討物理特性研究〞,國立中興大學物理研究所碩士論文(2013)。
過去二十年來許多類型的材料出現 有趣且不同以往的磁性行為出現。,

自從 1999 年開始,由中國中科院物理研究所沈保根等人研究發現新型
磁製冷 NaZn13-結構的化合物 La(Fe13-xSix)13。當 x<1.6 時,La(Fe13-xSix)13 有巨大的自由電子磁變和磁熱效應。在居禮溫度時,即使是低外加磁場下,仍有高效率的的磁製冷。由於自由電子磁變是因為磁性材料由鐵磁態轉成順磁態,所以發生自由電子磁變時,材料會產生巨大的磁熱效應。

從交流磁化率所測量出的數據去分析 La(Fe11.8Si1.2)13 的一些有趣的行為,當中包含了磁化率 χ、損耗角 δ、可逆磁化過程中的實部 χ'、不可逆的磁化過程 χ'。由分析品質因子和損耗係數去了解La(Fe11.8Si1.2)13 能量儲存和損耗,並且討論在不同的溫度、頻率的條件下,La(Fe13-xSix)13 在外加磁場為交流磁場的情形下,材料磁化率的變化。

During last two decades many novel magnetic materials with interesting behavior and abnormal magnetic ordering have been found.The research was extended to various kinds of
Iron-based magnetic materials.There are ferrofluids molecular magnets and nano magnets.All、of them show new interesting magnetic properties, such as metamagnetism、helimagnetism、spin glass、supperparamagnetism.

Since 1999 B.G.Shen et. al in the Chinese Academy have found a new compound La(Fe13-xSix)13 of magnetic refrigerant. The compound has cubic NaZn13-type crystal structure. As x < 1.6, the La(Fe13-xSix)13 compound has large itinerant-electron metamagnetic (IEM) trasition and magnetocaloric effects (MCEs). This magnetic refrigerant has high performace when T=Tc even in relatively low magnetic fields.Due to the itinerant-electron metamagnetic (IEM) trasition that is first order magnetic trasition from the paramagnetic to ferromagnetic state, the materials have large magnetocalorics effects.

Because the AC susceptibility is a powerful method for examining the nature of magnetic phase transition.So,in the experiment, we will discussed La(Fe11.8Si1.2)13 of interesting phenomena. Measurement yields some quantities include the magnitude of the susceptibility, χ , and the phase shift, δ,have an in-phase, or real component χ' that related to the reversible magnetization processe with the oscillating field,another is an out-of-phase, or imaginary component χ' that related to loss due to irreversible magnetization processe、energy sorbed from the field.

Analysis the quality factor Q and disspation factor tanδ to understand the energy loss and storage of material La(Fe13-xSix)13 and discussed the different temperture and frequency on the alternating magnetic susceptibility variation in the material of La(Fe11.8Si1.2)13.
Rights: 同意授權瀏覽/列印電子全文服務,2018-07-15起公開。
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