Synthetic method of mixed-valence rare earth iron-based oxide block material

Abstract

The invention belongs to the field of inorganic nonmetal functional ceramic powder materials, and particularly relates to a method for realizing synthesis and sintering integration of a metastable-state mixed-valence rare earth iron-based oxide ceramic material through a sintering technology for triggering synchronous reaction of a precursor by using pressure and discharge breakdown under a metastable-state or unbalanced condition. Through cooperative regulation and control of applied current and pressure, and in combination with sintering mold design, sintering time control and precursor character control, accurate regulation and control of nucleation and growth characteristics of the metastable phase material system can be realized, and the physical properties of the synthesized ceramic material are further regulated and controlled. The prepared block material has the temperature-induced charge ordered transition characteristic, multiferroic property, thermistor characteristic and piezoresistor characteristic; the material has considerable application value in preparation of functional electronic devices, sensors, thermistors, magnetic sensing devices and the like.

Description

technical field

[0001] The invention belongs to the field of inorganic non-metallic functional ceramic powder materials, and specifically relates to a method for obtaining a metastable rare earth iron-based oxide bulk material in a mixed valence state through one-step sintering by using a discharge plasma sintering technology. The prepared block material has temperature-induced charge order transition characteristics, multiferroicity, thermistor characteristics and piezoresistive characteristics; it has considerable application value in the preparation of functional electronic devices, sensors, thermistors, magnetic sensor devices, etc. Background technique

[0002] Rare earth iron-based mixed valence oxide LnFe 2 o 4 (Ln=Lu, Yb, Tm, Er, Ho, Dy, Y, etc.) belong to the layered triangular lattice, due to the electronic correlation effect and the crystal geometry structure has the characteristics of charge suppression, which leads to the occurrence of orderly charge transforma...

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