首页|还原处理对La0.67Sr0.20Cu0.10□0.03MnO3材料磁电阻性能的影响

还原处理对La0.67Sr0.20Cu0.10□0.03MnO3材料磁电阻性能的影响

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采用溶胶-凝胶(sol-gel)法制备了名义组分为La0.67Sr0.20Cu0.10□0.03MnO3(□代表阳离子空位)的多晶母体粉体材料,在不同温度(200℃,250℃,300℃)的氢气环境中对母体粉体材料还原15分钟后,在1100℃氩气环境中烧结12小时得到系列块体样品.研究了块体样品的相结构,导电性质、磁学性质以及磁电阻效应.实验结果表明,在适当温度的氢气环境中对粉体材料还原,可减少乃至消除粉体样品中的Mn3O4杂相,从而可以使块体样品电阻率降低,磁电阻峰值提高.在1.8T外磁场下,La0.67Sr0.20Cu0.10□0.03MnO3母体样品的磁电阻在319K出现峰值,其峰值为24.6%;在250℃还原15分钟样品,其磁电阻峰值达到31.5%.
Effect of Reducing Treatment on the Magnetoresistance of Manganite La0.67Sr0.20Cu0.10□0.03MnO3
La0.67Sr0.20Cu0.10□0.03 MnO3 ("□" representing cation vacancy) poly-crystalline manganite powder was synthesized by sol-gel method, after reduced in hydrogen atmosphere for 15 minutes at different temperature (200℃ , 250℃ , 300℃), the series bulk samples were obtained by sintering in argon atmosphere for 12 hrs at 1100℃ . The structure, electrical and magnetic properties as well as colossal magnetoresistance (MR) of the bulk samples were researched in detail. Experiment results indicate that: the Mn3O4 impurity phase in the samples could decrease or disappear by reducing treatment in a hydrogen atmosphere at proper temperature; and resulting in the decrease of resistivity and increase of magnetoresistance peak value for the bulk samples. Under an applied magnetic filed of 1. 8T, for La0.67 Sr0.20Cu0.10□0.03MnO3 non-reduced materials, the maximum value of MR is 24.6% at 319K; for the sample reduced for 15 minutes at 250℃., its peak value of MR reached 31.5%.

sol-gel methodperovskite structurereducing treatmentmagnetic propertiesmagnetoresistance effect

唐贵德、赵宏微、侯登录、李壮志、赵旭、齐伟华、赵福伟、户立春、李志青

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河北师范大学物理科学与信息工程学院,河北,石家庄,050016

溶胶-凝胶法 钙钛矿结构 还原 磁学性质 磁电阻效应

河北省自然科学基金河北省教育厅科研项目

E20060001682005358

2007

材料科学与工程学报
浙江大学

材料科学与工程学报

CSTPCDCSCD
影响因子：0.765
ISSN：1673-2812
年,卷(期)：2007.25(1)
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