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(La0.57Dy0.1)Sr0.33MnO3多晶納米顆粒的磁熱性能
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Magnetocaloric Properties in (La0.57Dy0.1)Sr0.33MnO3 Poly- crystalline Nanoparticles
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National Natural Foundation of China (50672015)

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    摘要:

    采用非晶態(tài)前驅(qū)體的方法在800 °C的低溫下制備出(La0.57Dy0.1)Sr0.33MnO3納米顆粒，用XRD、HRTEM和MPMS等手段對(duì)納米顆粒的微觀結(jié)構(gòu)和磁性能進(jìn)行研究。XRD和ED分析表明，所有的樣品都具有單相鈣鈦礦結(jié)構(gòu)；通過對(duì)樣品不同溫度下等溫磁場(chǎng)的測(cè)量和計(jì)算，發(fā)現(xiàn)在居里溫度點(diǎn)(358 K) (La0.57Dy0.1)Sr0.33MnO3納米顆粒的最大磁熵變隨著磁場(chǎng)的增加而增加，即使在5 T磁場(chǎng)下也沒有達(dá)到飽和；居里溫度附近納米顆粒具有較大的磁熱效應(yīng)和較寬的峰值溫度范圍，這些良好性能可能和納米顆粒具有大的表面和界面有關(guān)。

    Abstract:

    Nanosized particles of (La0.57Dy0.1)Sr0.33MnO3 perovskite-type oxides were successfully synthesized at relatively low calcinated temperature of 800 °C for 10 h using amorphous molecular alloy as precursor. X-ray diffraction (XRD) and electron diffraction (ED) revealed that the resulting product is of pure single-phase rhombohedral structure. From the measurements and calculation of isothermal magnetization at different temperatures, we discovered that the maximum magnetic entropy change at TC (358 K) increases near linearly with magnetic field increasing and shows no sign of saturation even under 5 T; moreover, a comparatively large magnetic entropy change with broader peak temperature range around the Curie temperature is also observed, and this good performance may be related to the large surface and interface of nanoparticles.

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趙 娟,李麗榮,王 貴.(La0.57Dy0.1)Sr0.33MnO3多晶納米顆粒的磁熱性能[J].稀有金屬材料與工程,2009,38(10):1707~1710.[Zhao Juan, Li Lirong, Wang Gui. Magnetocaloric Properties in (La0.57Dy0.1)Sr0.33MnO3 Poly- crystalline Nanoparticles[J]. Rare Metal Materials and Engineering,2009,38(10):1707~1710.]
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  • 收稿日期:2008-10-19
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