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Solid material with perovskite-like structure and preparation method thereof

A technology of perovskite structure and solid material, applied in the direction of carbides, carbon oxides/sulfur carbides, etc., can solve the problems of high preparation cost, low mechanical strength and high cost, and achieve simple preparation, cheap raw materials and stable structure. Effect

Inactive Publication Date: 2014-09-03
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, such materials that have been reported have insurmountable weaknesses, such as ZrW 2 o 8 Material, non-conductive, high preparation cost, low mechanical strength, etc., and Invar alloy has problems such as anisotropy, high cost, easy oxidation, etc., and its application is limited

Method used

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  • Solid material with perovskite-like structure and preparation method thereof
  • Solid material with perovskite-like structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) According to stoichiometric ratio Mn 3 SnC x , x=0.7 takes by weighing manganese powder, tin powder and graphite powder;

[0037] (2) Grind the three kinds of powders in a mortar for more than 1 hour, and mix well;

[0038] (3) The uniformly mixed powder is compressed into flakes using a stainless steel mold and a tablet press;

[0039] (4) Pack the sample that is compressed into a sheet into a quartz tube, then connect the quartz tube to the molecular pump and vacuumize it. When the vacuum reaches 10 -4 At Pa, use an oxyacetylene flame to melt the quartz tube and seal it;

[0040] (5) Put the vacuum quartz tube with the sample into the sintering furnace, raise the temperature to 600°C at a rate of 5°C per minute, keep it at this temperature for 80 hours, and then cool it with the furnace;

[0041] (6) After cooling, the quartz tube is broken, and the intermediate product sample is taken out from the quartz tube, and crushed with a press;

[0042] (7) Put the c...

Embodiment 2

[0051] (1) According to stoichiometric ratio Mn 3 SnC x , x=0.8 takes by weighing manganese powder, tin powder and graphite powder;

[0052] (2) Grind the three kinds of powders in a mortar for more than 1 hour, and mix well;

[0053] (3) The uniformly mixed powder is compressed into flakes using a stainless steel mold and a tablet press;

[0054] (4) Pack the sample that is compressed into a sheet into a quartz tube, then connect the quartz tube to the molecular pump and vacuumize it. When the vacuum reaches 10 -4 At Pa, use an oxyacetylene flame to melt the quartz tube and seal it;

[0055] (5) Put the vacuum quartz tube with the sample into the sintering furnace, heat up to 1000°C at a rate of 15°C per minute, keep it at this temperature for 120 hours, and then cool it with the furnace;

[0056] (6) After cooling, the quartz tube is broken, and the intermediate product sample is taken out from the quartz tube, and crushed with a press;

[0057] (7) Put the crushed samp...

Embodiment 3

[0066] (1) According to stoichiometric ratio Mn 3 SnC x , x=0.9 takes by weighing manganese powder, tin powder and graphite powder;

[0067] (2) Grind the three kinds of powders in a mortar for more than 1 hour, and mix well;

[0068] (3) The uniformly mixed powder is compressed into flakes using a stainless steel mold and a tablet press;

[0069] (4) Pack the sample that is compressed into a sheet into a quartz tube, then connect the quartz tube to the molecular pump and vacuumize it. When the vacuum reaches 10 -4 At Pa, use an oxyacetylene flame to melt the quartz tube and seal it;

[0070] (5) Put the vacuum quartz tube with the sample into the sintering furnace, raise the temperature to 800°C at a rate of 10°C per minute, keep it at this temperature for 100 hours, and then cool it with the furnace;

[0071] (6) After cooling, the quartz tube is broken, and the intermediate product sample is taken out from the quartz tube, and crushed with a press;

[0072] (7) Put the...

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Abstract

The invention discloses a solid material with a perovskite-like structure and a preparation method thereof. The molecular formula of the solid material with the perovskite-like structure is Mn3SnCx, wherein the atomic ratio is Mn: Sn: C=3 to 1 to x, and x is 0.6-1.2. The crystal structure of the solid material with the perovskite-like structure is a perovskite-like cubic structure. The series solid material with the perovskite-like structure, which is disclosed by the invention, has negative thermal expansion performance within a relatively wide temperature range near the room temperature. The solid material with the perovskite-like structure, which is disclosed by the invention, has isotropy, and has good thermal conductivity. The electrical resistivity of the solid material with the perovskite-like structure is close to the electrical resistivity range of a semiconductor material.

Description

technical field [0001] The invention relates to the technical field of inorganic synthesis, in particular to a solid material with a perovskite-like structure and a preparation method thereof. Background technique [0002] Generally, solid materials have the characteristics of thermal expansion and cold contraction. However, in some special cases, it is desired that the material has special physical properties of negative expansion or zero expansion. Therefore, negative expansion materials are one of the hot topics in current material science research. The so-called negative expansion performance refers to that within a certain temperature range, as the temperature increases, the length or volume of the material decreases. Because this kind of material can be used to adjust the expansion coefficient of some key components, it has high research and practical application value. With the development of science and technology, materials with this property will be widely used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30C01B32/907
Inventor 温永春王聪孙莹余德洋
Owner YANCHENG INST OF TECH