Enhancement of Magnetic coupling in Nd0.5Ca1-xSrxMnO3 by dopping Sr
碩士 === 國立中央大學 === 物理研究所 === 95 === Polycrystalline samples of Nd0.5Ca0.5−ySryMnO3 with 0≦y≦0.5 are prepared by the standard solid state reaction technique. Crystall structure of Nd0.5Ca0.5-ySryMnO3 at room temperature is revealed by using x-ray diffraction technologies. It crystallized into an orth...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/33624488587455264008 |
| Summary: | 碩士 === 國立中央大學 === 物理研究所 === 95 === Polycrystalline samples of Nd0.5Ca0.5−ySryMnO3 with 0≦y≦0.5 are prepared by the standard solid state reaction technique. Crystall structure of Nd0.5Ca0.5-ySryMnO3 at room temperature is revealed by using x-ray diffraction technologies. It crystallized into an orthorombic Pbnm phase at room temperature. Nd0.5Sr0.5MnO3 crystallized into an orthorombic Imma phase. We discover that Nd0.5Ca0.5MnO3、Nd0.5Ca0.19Sr0.31MnO3、Nd0.5Sr0.5MnO3 have the Jahn-Taylor distortion in X-ray diffraction patterns at the temperatures : 260K、160K、180K. The magnetization measurements were carried out with the a Physical Property Measurement System . By the result know doping Sr causes the angle of Mn+4-O- Mn+3 to become larger. Causes its coupling enhancement change the temperature of ferromagnetic transforms toward the higher temperature. We discover that Nd0.5Ca0.19Sr0.31MnO3、Nd0.5Sr0.5MnO3 have two peak at 250 K, due to the ferromagnetic ordering of Mn+3 and Mn+4. This research can obtain the magnetic field to the temperature phase diagram, presents the Nd0.5Ca0.5-ySryMnO3 system the physical property.
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