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Cage type compound

A compound and cage-type technology, applied in the field of cage compounds, can solve problems such as limited lattice atom adjustment ability and poor thermoelectric performance.

Inactive Publication Date: 2009-03-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, people's ability to adjust the lattice atoms is still very limited, and there is no good way to optimize the thermoelectric performance.

Method used

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Examples

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preparation example Construction

[0085] The present invention provides a more specific embodiment, the preparation method in this embodiment includes the following steps:

[0086] (a) providing a mixture of 9.2 to 16 molar fractions of component M, (x to 1.5x) molar fraction of component A, and (0.8 to 1.2)*(y-x) molar fraction of component B;

[0087] Wherein M is an alkaline earth metal, a rare earth metal, an alkali metal, a Cd atom or a combination thereof,

[0088] A is Ga, Al, In, Zn or a combination thereof;

[0089] B is Ge, Si, Sn, Ni or a combination thereof;

[0090] 12≤x≤16, 40≤y≤43, x and y are each integer or non-integer;

[0091] (b) quenching after heating the mixture in step (a) to a fully molten state to obtain a quenched mixture;

[0092] (c) Grinding the quenched mixture in step (b) into powder, removing impurities and excess raw materials to obtain quenched mixture powder;

[0093] (d) Sintering the quenched mixture powder in step (c) by a pulsed current rapid sintering method to obta...

Embodiment 1

[0147] Example 1 Ba 8 Ga 12 Ge 29 Preparation of cage compounds

[0148] The metal raw materials Ba, Ga and Ge are dosed according to the molar ratio of 9.3 (16.2% in excess): 14.5 (20.8% in excess): 29, and sealed in a quartz tube. The packaged raw material is heated to 1080° C. for 10 hours and then quenched with water to obtain crystal ingots. The powder obtained by grinding the ingot is soaked in hydrochloric acid (30% concentration, the weight ratio of acid to powder is 100:1) and pickled. The dried powder after pickling is sintered into a dense block by using the pulse energization rapid sintering sintering technology (heating rate 100 degrees / min) at 730° C. for 3 minutes under vacuum (vacuum degree 6 Pa). Scanning electron microscope photo SEM of the polished surface (such as figure 1 ) and energy spectrum analysis diagrams (such as figure 2 ), indicating that the obtained material is a pure phase. Table 3 is figure 1 The atomic percentage results of the three...

Embodiment 2

[0149] Example 2 Sr 8 Ga 13 Ge 27 Preparation of cage compounds

[0150] The metal raw materials Sr, Ga and Ge are dosed according to the molar ratio of 9.25 (15.6% in excess): 15.4 (18.5% in excess): 27, and sealed in the quartz tube. The packaged raw materials were heated to 1080° C. for 4 hours and then oil quenched to obtain crystal rods. The powder obtained by grinding the ingot is soaked in hydrochloric acid (50% concentration, the weight ratio of acid to powder is 50:1) and pickled. The dried powder after pickling is sintered into a dense block at 650°C under vacuum using the pulse energization rapid sintering sintering technology. Its performance is shown in the performance examples. like Figure 5 The X-ray diffraction pattern of the obtained material shows that the obtained material is a cage phase of a type I cage (clathrate) structure. According to energy spectrum analysis, it is measured that each part of the material has a uniform composition Sr 8 Ga13 Ge...

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Abstract

The invention discloses a cage compound with the following formula 1: M8AxBy-x, wherein, M can be alkaline-earth metal, rare-earth metal, alkali metal, Cd atom or the combination thereof; A can be Ga, Al, In, Zn or the combination thereof; B can be Ge, Si, Sn, Ni or the combination thereof; and x is larger than or equal to 12 and smaller than or equal to 16, y is larger than or equal to 40 and smaller than or equal to 43, and x and y are integers or non-integers respectively. The invention provides the cage compound with better pyroelectricity and a preparation method thereof.

Description

technical field [0001] The invention relates to a thermoelectric material, more particularly to a cage compound. Background technique [0002] A thermoelectric material is a material that can directly convert heat energy to electrical energy, and its performance can be determined by the dimensionless thermoelectric merit ZT (ZT=TS 2 σ / κ), where S, σ, κ, and T are the Seebeck coefficient, electrical conductivity, thermal conductivity, and absolute temperature, respectively. It can be seen from the ZT expression that materials with low thermal conductivity, high Seebeck coefficient and high electrical conductivity can obtain good thermoelectric properties. In general, narrow-band semiconducting materials with low thermal conductivity will be possible to obtain good thermoelectric performance. [0003] Specific cage compounds can be used as excellent thermoelectric materials. Cage structure compounds have attracted the interest of thermoelectric researchers because they can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/14C22C1/04H10N10/851H10N10/855H10N60/85H10N10/01
CPCH01L35/22C22C13/00B22F2998/10B22F2999/00C22C19/00C22C2202/02C22C28/00C22C1/04H10N10/8556B22F9/04B22F3/10B22F2202/13
Inventor 陈立东王丽张闻斌柏胜强周燕飞何琳
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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