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首页> 外文期刊>Energy Harvesting and Systems >Modulated Magneto-Thermal Response of La0.85Sr0.15MnO3 and (Ni0.6Cu0.2Zn0.2)Fe2O4 Composites for Thermal Energy Harvesters
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Modulated Magneto-Thermal Response of La0.85Sr0.15MnO3 and (Ni0.6Cu0.2Zn0.2)Fe2O4 Composites for Thermal Energy Harvesters

机译：La 0.85 Sr 0.15 MnO 3 和（Ni 0.6 Cu 0.2 < / sub> Zn 0.2 ）Fe 2 O 4 用于热能收集器的复合材料

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摘要

The magneto-thermoelectric generator (MTG) converts wasted thermal energy into electrical energy in two steps. The first step involves thermal to mechanical energy conversion through balance of magnetic and elastic forces and the second step involves mechanical to electrical energy conversion through piezoelectric effect. The requirements for soft magnetic material in improving the efficiency of first step were identified and met through the design of a composite architecture. The Curie temperature of La(1–x)SrxMnO3 can be engineered to be near room temperature by modifying the Sr content. Composite of La0.85Sr0.15MnO3 (LSMO) and Ni0.6Cu0.2Zn0.2Fe2O4 (NCZF) was found to exhibit high saturation (Ms) and remnant (Mr) magnetization magnitude while maintaining the soft magnetic nature. Two-step sintering was found to prevent the inter-diffusion of LSMO and NCZF phases and provided high density without grain growth. The LSMO-NCZF (70:30 wt%) composite exhibited a large variation in Ms with respect to the change in temperature near Curie temperature which meets the requirements for efficient operation of MTG. The fabricated MTG using LSMO-NCZF (70:30 wt%) composite reached 0.2?Hz operational frequency and generated electrical output voltage of 2?Vp–p and peak power of 17?μW under the thermal gradient of 80?°C (0?°C/80?°C).
机译：磁热电发电机（MTG）分两步将浪费的热能转换为电能。第一步涉及通过磁力和弹力的平衡将热能转换为机械能，第二步涉及通过压电效应将机械能转换为电能。通过复合结构的设计，确定并满足了软磁材料提高第一步效率的要求。 La（1–x）SrxMnO3的居里温度可以通过修改Sr含量而设计为接近室温。发现La0.85Sr0.15MnO3（LSMO）和Ni0.6Cu0.2Zn0.2Fe2O4（NCZF）的复合材料表现出高饱和度（Ms）和残余（Mr）磁化强度，同时保持软磁特性。发现两步烧结可防止LSMO和NCZF相的相互扩散，并提供高密度而无晶粒长大。 LSMO-NCZF（70:30 wt％）复合材料相对于居里温度附近的温度变化表现出很大的Ms变化，这满足了MTG有效运行的要求。使用LSMO-NCZF（70:30 wt％）复合材料制成的MTG在80？C的热梯度下达到0.2？Hz的工作频率，产生2？Vp–p的输出电压和17？μW的峰值功率（0 ℃/ 80℃）。

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