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

A technology of iron-based oxides and bulk materials, applied in the field of inorganic non-metallic functional ceramic powder materials, can solve the problems of poor repeatability of material performance, complicated and dangerous preparation steps, etc.

Active Publication Date: 2021-06-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the previous metastable LnFe 2 o 4 The synthesis of solid and thin film materials involves complex and dangerous preparation steps, and the performance of the synthesized materials is not reproducible

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Mix ytterbium oxide and iron oxide powder according to the stoichiometric ratio, grind and mix by hand or high-energy ball mill, then put it into graphite mold for cold pressing, add carbon paper, and heat in a medium and low vacuum environment of 0.1-200Pa with a pulse current of 100-2000A Apply a pressure of 20-60MPa to 1000-1100°C and anneal in situ at 1000-1100°C for 2-10min to obtain YbFe 2 o 4 blocks. Its XRD spectrum is as figure 1 As shown, it is proved that the successful synthesis of YbFe 2 o 4 bulk material.

Embodiment 2

[0057] Mix lutetium oxide and iron oxide powder according to the stoichiometric ratio and mix them manually or by high-energy ball milling, put them into a graphite mold for cold pressing, add carbon paper, and heat in a medium-to-low vacuum environment of 0.1-200Pa with a pulse current of 100-2000A Apply a pressure of 20-60MPa to 1000-1100°C and anneal in situ at 1000-1100°C for 2-10min to obtain LuFe 2 o 4 blocks. The successful synthesis of YbFe was proved by XRD spectrum 2 o 4 bulk material.

Embodiment 3

[0059] Mix thulium oxide and iron oxide powder according to the stoichiometric ratio, grind and mix by hand or high-energy ball mill, put them into graphite mold for cold pressing, add carbon paper, and heat in a medium and low vacuum environment of 0.1-200Pa by pulse current 100-2000A Apply a pressure of 20-80MPa to 1050-1150°C and anneal in situ at 1050-1150°C for 2-10min to obtain TmFe 2 o 4 blocks. The successful synthesis of YbFe was proved by XRD spectrum 2 o 4 bulk material.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/50C04B35/505C04B35/622C04B35/64
CPCC04B35/2675C04B35/50C04B35/505C04B35/622C04B35/64C04B2235/666
Inventor 陈吉堃崔雨晨
Owner UNIV OF SCI & TECH BEIJING
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