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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >High-temperature solvothermal synthesis and magnetic properties of nearly monodisperse CdCr2S4 nanocrystals
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High-temperature solvothermal synthesis and magnetic properties of nearly monodisperse CdCr2S4 nanocrystals

机译:几乎单分散的CdCr2S4纳米晶体的高温溶剂热合成和磁性

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摘要

Magnetic spinel CdCr2S4 nanocrystals have been synthesized using a high-temperature solvothermal method. The synthesis process involves the reaction of excess 1-dodecanethiol (1-DDT) with CdCl2 and CrCl3 center dot 6H(2)O in 1-octadecene (ODE) solution carried out in a sealed titanium alloy autoclave. Nearly monodisperse spherical CdCr2S4 nanocrystals with an average size of 8.0 +/- 1.5 nm are obtained. X-ray diffraction patterns confirm formation of the pure spinel phase without any impurities. Magnetic measurements indicate a Curie temperature (T-c) of similar to 76 K for the synthesized CdCr2S4 nanocrystals, which are ferromagnetic at lower temperatures with a saturation magnetization value of 19 emu g(-1) at 5 K. The magnetic entropy change Delta S-m, evaluated from isothermal magnetic measurements, exhibits a maximum around 82 K, with a value of -Delta S-m = 0.86 J kg(-1) K-1 at H-max = 5 T. Delta S-m spans a broad temperature range, with a full width at half maximum of similar to 88 K in the magnetic field range of 0-5 T, which is attractive for magnetic refrigeration applications in the liquid nitrogen temperature range.
机译:磁性尖晶石CdCr2S4纳米晶体已使用高温溶剂热法合成。合成过程涉及在密封的钛合金高压釜中,在1-十八碳烯(ODE)溶液中使过量的1-十二烷硫醇(1-DDT)与CdCl2和CrCl3中心点6H(2)O反应。获得具有8.0 +/- 1.5nm的平均尺寸的几乎单分散的球形CdCr 2 S 4纳米晶体。 X射线衍射图证实没有任何杂质的纯尖晶石相的形成。磁性测量表明,对于合成的CdCr2S4纳米晶体,居里温度(Tc)接近76 K,在较低温度下为铁磁性,在5 K时的饱和磁化值为19 emu g(-1)。磁熵变Delta Sm,从等温磁测量得到的结果表明,最大峰约为82 K,在H-max = 5 T时-Delta Sm = 0.86 J kg(-1)K-1。DeltaSm跨很宽的温度范围,在0-5 T的磁场范围内,其最大半宽度约为88 K,这对于液氮温度范围内的磁性制冷应用很有吸引力。

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