查詢結果分析
來源資料
相關文獻
- Cryatal Structure,Magnetic and Magnetotransport Properties of Double Perovskites Sr[feaf]FeMO[feb8](M=Mo,W)
- 垂直式磁性穿隧結的發展簡介
- Sm(Co, M)₇(M=Hf, V, Nb, and Ta)合金薄帶磁性及晶體結構之研究
- La[feaf]O[feb0]對CaO、6Fe[feaf]O[feb0]的晶體結構及磁性的影響
- La[feaf]O[feb0]對CaO 6Fe[feaf]O[feb0]的晶體結構及磁性的影響
- 花東地區半寶石與金屬材料之結合應用--首飾類
- 磁漏法鐵磁性管件檢測之改進
- Metal Carbonyl Complexes Containing Linear Tetradentate Phosphine and Amine Ligands
- La[fec5] Pb戓MnO[feb0]磁性材料的研製與其物理特性之探討
- Thermal Relaxation in Magnetic Materials
頁籤選單縮合
題名 | Cryatal Structure,Magnetic and Magnetotransport Properties of Double Perovskites Sr[feaf]FeMO[feb8](M=Mo,W)=雙層鈣鈦礦結構Sr[feaf]FeMO[feb8](M=Mo,W)之晶體結構,磁性及磁傳導性質 |
---|---|
作者姓名(中文) | 黃昭淵; 詹丁山; 劉汝熹; 郭光宇; | 書刊名 | 華岡工程學報 |
卷期 | 17 2003.06[民92.06] |
頁次 | 頁21-30 |
分類號 | 440.35 |
關鍵詞 | 雙層鈣鈦礦; 晶體結構; 磁性; 磁傳導; 金屬材料; Magnetoresistance; Half-metallic; Antiferromagnetic; Sr[feaf]FeMoO[feb8]; Sr[feaf]FeWO[feb8][feb8]; |
語文 | 英文(English) |
中文摘要 | 我們研究了 double perovskites Sr2FeMO6(M=Mo,W)的晶體結構,磁性及磁傳導的性質,所用之材料由固態反應獲得X光分析換明Sr2FeMO6(SFMO)及Sr2FeMO6(SFWO)分別為tetragoual (space group: 14/mmm)及orthorhomic (space group: 1/mmm)磁性量測顯示SFMO為鐵磁,而SFWO為反鐵磁(在H=5T時,TN=35K)我們在室溫時得到SFWO是磁阻比(MR)為約22%(H=3T)。但是SFMO的MR~1%,H=3T,T=300K,算是不顯出。此兩化合物之性質綜合如下:SFMO為半金屬,鐵磁;SFWO為絕緣體,反鐵磁。此觀測之變化亦由帶計算證實,解釋過度金屬離子之3d(Fe),4d(Mo)和5d(W)及氧離子之相互作用所產生。 |
英文摘要 | We have investigated the crystal structure, magnetic and magnetotransport properties of double perovskites Sr2FeMO6(M=Mo,W). The materials have been prepared in polycrystalline by solid state reaction. Powder X-ray diffraction analyses revealed that Sr2FeMO6(SFMO) and Sr2FeMO6(SFWO) have the tetragonal cell (space group: I4/mmm) and the orthorhombic cell (space group: Immm), respectively. Magnetic measurements indicate that SFMO is a ferromagnet and SFWO is an antiferromagnet with TN=35 K at H=5 T. Large magnetoresistance ratio (MR) of ~22% (H=3 T) at room temperature (RT) was observed in the SFWO compound. However, the SFMO compound did not show any significant MR even at high fields and RT (MR~1%; H=3 T and 300 K). The properties of these two compounds are summarized as follows: SFMO-half-metallic and ferromagnetic; SFWO-insulator and antiferromagnetic. The changes observed by physical measurements are supported by band structure calculations to explain the interaction between the 3d(Fe)、4d(Mo) and 5d(W) orbitals of transition metal ions and oxygen ions. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。