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Transition metal composite oxides and preparation method thereof

A composite oxide, transition metal technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, cobalt oxide/cobalt hydroxide, etc., can solve the problems of long reaction time, high reaction temperature, easy generation of impurities, etc. To achieve the effect of uniform particles, low reaction temperature and short time

Inactive Publication Date: 2008-04-09
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of high reaction temperature, long reaction time and easy generation of impurities in the existing preparation method of Ca-Co-O system, and to provide a transition metal composite oxide and its preparation method

Method used

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  • Transition metal composite oxides and preparation method thereof
  • Transition metal composite oxides and preparation method thereof
  • Transition metal composite oxides and preparation method thereof

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specific Embodiment approach 1

[0011] Specific embodiment one: the general formula of the transition metal composite oxide in this embodiment is Ca 2-x m x co 2 o 5 , wherein M is Na, Ag, La or Bi, and its preparation method realizes by following reaction: One, Ca(NO 3 ) 2 4H 2 O and Co(NO 3 ) 2 ·6H 2 O, or Ca(NO 3 ) 2 4H 2 Nitrate of O, M and Co(NO 3 ) 2 ·6H 2 Dissolve O in deionized water respectively, then mix according to the stoichiometric ratio of the molecular formula, then slowly pour into the citric acid solution according to the molar ratio of citric acid to all metal ions as 1-2:1, and then oscillate ultrasonically for 20-40 minutes to form a sol 2. Using microwave heating to process the sol obtained in step 1, the microwave heating temperature is 100°C, and the heating time is 20-60min to obtain a wet gel; 3. Dry the wet gel obtained in step 2 at 100-130°C for 10-10 minutes. 15h to obtain dry gel, and then self-propagating combustion of the dry gel; 4. Grind the reactant treated in...

specific Embodiment approach 2

[0012] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that after completing the operation of step 5, the transition metal composite oxide powder obtained in step 5 is molded, and then microwave sintered under 1400W for 30 minutes.

[0013] The molding and microwave sintering reactions in this embodiment are for making the transition metal composite oxide material denser.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that Ca(NO 3 ) 2 4H 2 Nitrate of O, M and Co(NO 3 ) 2 ·6H 2 O is mixed according to the stoichiometric ratio of the molecular formula. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses composite oxide of transition metal and the preparing method thereof, and relates to thermoelectric material and the preparing method thereof; the invention solves the problems of high reaction temperature, long reaction time and easy impurity production of the prior Ca-Co-O system preparing method. The general formula of the composite oxide is Ca2-xMxCo2O5, wherein, M refers to Na, Ag, La or Bi. The method contains the following procedures: firstly, dissolving Ca(NO3)2*4H2O and Co(NO3)2*6H2O or Ca(NO 3)2*4H2O, the nitrate of M and Co(NO3)2*6H2O respectively into deionized water and the mixing according to the stoichiometric ratio of the molecular formula, pouring slowing citric acid solution and performing ultrasonic oscillation to produce homogeneous sol; secondly, heating for dehydration with microwave to get wet sol; thirdly, drying the wet sol to get dry sol and allowing self-propagating combustion; fourthly, baking after grinding. Compared with the prior art, the invention has the advantages of short reaction time, low baking temperature and simple operation. The powder of the material of the invention has uniform particle distribution and high purity; the powder has flaky structure, and the particle diameter is smaller than 200nm; the prepared bulk material is compact and has relative density of more than 85 percent.

Description

technical field [0001] The invention relates to a thermoelectric material and a preparation method thereof, belonging to the field of oxide thermoelectric materials in functional materials; in particular to a transition metal composite oxide Ca 2-x m x co 2 o 5 and its preparation method. Background technique [0002] Thermoelectric materials are functional materials that use the Seebeck effect to generate electricity and use the Peltier effect to cool. Thermoelectric materials can convert heat into electrical energy or use electrical energy to cool in some environments with special requirements, and because thermoelectric materials cause little harm to the environment and humans during use (since thermoelectric materials use electrons in solid To achieve the purpose of exchanging energy, therefore, it is determined that thermoelectric devices have the characteristics of no moving parts, no maintenance, no pollution, and miniaturized volume) and have broad application pr...

Claims

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Application Information

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IPC IPC(8): C01G51/04C01F11/02C04B35/057C04B35/32C04B35/626
Inventor 陈刚刘璞生陆冬青周楠裴建
Owner HARBIN INST OF TECH
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