采用固相反应法制备了Ho0.5Pr0.5FeO3多晶样品,对其磁性和磁介电特性进行了系统研究.在T=4.5 K附近存在Ho离子的反铁磁相变,在T=59～80K可观测到Fe离子的自旋重取向转变,磁滞回线表明样品呈现弱铁磁性.在T=270 K,介电常数可达～103,研究表明该介电常数与270 K附近的电阻变化相关联,该处电阻变小,介质损耗减小,导致介电值变大.尤其重要的是,该样品在室温下表现出磁场诱导的巨磁介电效应,在频率f=1 kHz、外加磁场为1.6× 106 A/m下,其值可达5500％,该巨磁介电效应可能来源于磁电阻效应.
参考文献
| [1] | Scott J F.Data Storage:Multiferroic memories.Nature Materials,2007,6(4):256-257. |
| [2] | Kimura T,Kawamoto S,Yamada I,et al.Magnetocapacitance effect in multiferroic BiMnO3.Physical Review B,2003,67(18):180401-1-4. |
| [3] | Hur N,Park S,Sharma P A,et al.Colossal magnetodielectric effects in DyMn2O5.Physical Review Letters,2004,93(10):107207-1-4. |
| [4] | Katsufuji T,Mori S,Masaki M,et al.Dielectric and magnetic anomalies and spin frustration in hexagonal RMnO3(R=Y,Yb,and Lu).Physical Review B,2001,64(10):104419-1-6. |
| [5] | Sinclair D C,Adams T B,Morrison F D,et al.CaCu3Ti4O12:One-step internal barrier layer capacitor.Applied Physics Letters,2002,80(12):2153-2155. |
| [6] | Catalan G.Magnetocapacitance without magnetoelectric coupling.PhysicalReview Letters,2006,88(10):102902-1-3. |
| [7] | Chen Yajie,Zhang Xiao-Yu,Vittoria Carmine,et al.Giant magnetodielectric effect and magnetic field tunable dielectric resonance in spinel MnZn ferrite.Physical Review Letters,2009,94(10):102906-1-3. |
| [8] | Huang Ji-Quan,Hong Lan-Xiu,Han Gao-Rong,et al.Dielectric properties of a three phase Fe-Ni-BaTiO3 composite.Acta Physica Sinica,2006,55(7):3664-3669. |
| [9] | Chen Ying,Wang Genshui,Zhang Shuai,et al.Magnetocapacitance effects of Pb0.7Sr0.3TiO3/La0.7Sr0.3MnO3 thin film on Si substrate.Physical Review Letters,2011,98(5):052910-1-3. |
| [10] | Bujkof S,Georgievt D,Krezhov K,et al.Induced antiferromagnetism in HoFeO3.J.Phys.:Condens.Matter,1995,7(42):8099-8107. |
| [11] | Bhattacharjee Ashis,Saito Kazuya,Sorai Michio.Heat capacity and magnetic phase transitions of rare-earth orthoferrite HoFeO3.Journal of Physics and Chemistry of Solids,2002,63(4):569-574. |
| [12] | Shao Mingjie,Cao Shixun,Wang Yabin,et al.Single crystal growth,magnetic properties and Schottky anomaly of HoFeO3 orthoferrite.Journal of Crystal Growth,2011,318(1):947-950. |
| [13] | Bhat Monita,Kaur Balwinder,Kumar Ravi,et al.Dielectric characteristics of HoFeO3 crystals and their modification on SHI irradiation.Nuclear Instruments and Methods in Physics Research B,2006,245(2):480-490. |
| [14] | Prasad B V,Rao G N,Chen J W,et al.Colossal dielectric constant in PrFeO3 semiconductor ceramics.Solid State Sciences,2012,14(2):225-228. |
| [15] | Zhu Yun,Ju Sheng.Colossal magnetocapacitance induced by magnetoresistance effect in magnetic particle composite systems.Journal of Suzhou University,2006,22(4):57-60. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%