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Journal of Inorganic Materials

Journal of Inorganic Materials >

2015 , Vol. 30 >Issue 12: 1273 - 1277

DOI: https://doi.org/10.15541/jim20150218

Orginal Article

Low-temperature Synthesis and Characterizations of LaFeAsO Nanocrystals

  • De-Xing ZHANG ,
  • Yun-Lei SUN ,
  • Abuduweli ABULIMIT ,
  • Guang-Han CAO
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  • (1. College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China; 2. Department of Physics, Zhejiang University, Hangzhou 310027, China)
ZHANG De-Xing. E-mail: zdxzwy@mail.ahnu.edu.cn

Received date: 2015-05-08

  Revised date: 2015-06-20

  Online published: 2015-11-24

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Abstract

LaFeAsO as a parent compound of iron-based superconductor was synthesized at low temperatures. The mixtures of La2O3, LaCl3 and BaFe2As2 were ball-milled and the pressed pellets were sintered at 500℃ in vacuum. And nanocrystals of LaFeAsO were formed during the solid-state reaction. The solid-state reaction temperature for preparing LaFeAsO is 200℃ lower than the literature reported. The average crystallite size of the as-prepared LaFeAsO is less than 100 nm, as estimated by the X-ray diffraction Scherrer formula. Meanwhile, the c axis of the unit cell is increased by 0.001 nm, primarily stemming from the nanosize effect. Electrical resistivity measurement shows that the spin-density-wave anomaly becomes unremarkable, accompanied by a significant decrease in the transition temperature. The phenomena are discussed in terms of crystallite-size effect and the influence of lattice parameters.

Key words： LaFeAsO; low-temperature solid-state reaction; nanocrystals; spin-density wave

Cite this article

De-Xing ZHANG , Yun-Lei SUN , Abuduweli ABULIMIT , Guang-Han CAO . Low-temperature Synthesis and Characterizations of LaFeAsO Nanocrystals[J]. Journal of Inorganic Materials, 2015 , 30(12) : 1273 -1277 . DOI: 10.15541/jim20150218

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