Preparation method of novel Fe<1-x>TM<x>S single crystal material

Abstract

The invention discloses a preparation method of a novel Fe<1-x>TM<x>S single crystal material, TM is a transition metal including one of cobalt, nickel and copper elements, x is the stoichiometric number of TM, and x is more than or equal to 0.01 and less than or equal to 0.5. The preparation method comprises the following steps: step a, preparing Fe<1.6-x>TM<x>S2 polycrystals; step b, preparing a K<0.8>Fe<1.6-x>TM<x>S<2> single crystal; step c, preparing an aqueous solution of thiourea and sodium hydroxide; step d, adding iron powder, TM powder and K<0.8>Fe<1.6-x>TM<x>S<2> single crystal into the solution in the step c to obtain a mixed solution; step e, carrying out heat-preservation reaction on the mixed solution; and step f, washing the reacted solution with water and ethanol to obtain the Fe<1-x>TM<x>S single crystal with the tetragonal structure. According to the method, transition metal elements are successfully doped into the FeS single crystal with the tetragonal structure, Fe<1.6-x>TM<x>S2 polycrystal is used as a precursor, the content of the transition metal elements is accurately controlled, the reaction between elemental potassium and elemental sulfur in the growth process of the K<0.8>Fe<1.6-x>TM<x>S<2> single crystal is weakened, the cost is low, the process is simple, the raw materials are non-toxic, and the prepared single crystal is high in quality, large in size and suitable for industrial production. The method has important significance on the physical property research of the Fe<1-x>TMxS material system and the application of magnetic devices.

Description

Technical field [0001] The present invention relates to a new type of Fe 1-x TM x The method of preparing the S single crystal material is the field of preparation method of single crystal materials. Background technique [0002] In 2016, the ferromic superconductor FES single crystal was successfully prepared by hydrothermalization, and the superconducting transition temperature was 4.5k. Four-square structures FES superconductor as the simplest iron-based superconductor, with large anisotropy and lower upper velocons, and studies of angular distinguishing optical electronics indicate that their interior has large electronically associations. The FESE superconductors of the same structure do not have a structural phase change and an electron-liquid crystal phase at low temperatures, which makes it an important material associated between high temperature superconducting mechanism and electron liquid crystal phase and superconducting transition. [0003] Although FES superconduct...

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Problems solved by technology

[0004] In the traditional preparation method, impurity phases with hexagonal structure are easy to be produced, and the content of transition metal elements is difficult to control. At the same time, elemental potassium and sulfur elements will react violently, which may easily lead to preparation failure or poor crystal quality.

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