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Method for improving electrical transport property of polycrystalline ceramic

An electrical transport and ceramic technology, applied in the field of improving the electrical transport performance of polycrystalline ceramics and La1-xCaxSryMnO3-based polycrystalline ceramics, can solve the problem of general regulation effect, reduced ceramic life, low regulation temperature range, etc. problems, to achieve the effect of being beneficial to popularization and commercial use, improving the service life of ceramics, and ensuring product quality

Active Publication Date: 2018-11-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current process technology has the following disadvantages: (1) La 1-x Ca x Sr y MnO 3 The control temperature range of the base polycrystalline ceramics is relatively low, which cannot be close to the room temperature range that can be applied on a large scale, and the TCR and T P The regulation effect of is average; (2) In order to make La 1- x Ca x Sr y MnO 3 The stability of the control effect and the improvement of the control range of the base polycrystalline ceramics require a large amount of doping with low cost-effective elements. First, it is not conducive to the transition to pilot production or even subsequent mass production, and it cannot be commercialized. Second, because of the large amount of doping Make the phase structure in the ceramic change or become unstable, reduce the service life of the ceramic and even fail to guarantee the product quality

Method used

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  • Method for improving electrical transport property of polycrystalline ceramic
  • Method for improving electrical transport property of polycrystalline ceramic
  • Method for improving electrical transport property of polycrystalline ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A way to improve La 1-x Ca x Sr y MnO 3 The method of base polycrystalline ceramic electric transport performance includes the following steps:

[0045] 1. La 0.95 Ca 0.05 Sr 0.01 MnO 3 Base powder synthesis:

[0046] 1.1 Weigh out 0.95mol La(NO 3 ) 3 , 0.05mol Ca(NO 3 ) 2 , 0.01mol Sr(NO 3 ) 2 , 1mol Mn(NO 3 ) 2 And 3mol citric acid, sequentially poured into deionized water and coordinated with synchronous stirring to obtain Process I;

[0047] 1.2 Add 6 mL of ethylene glycol (the volume ratio of ethylene glycol to process I is 3%) to process product I obtained in step 1.1 to obtain process product II;

[0048] 1.3 The process product II obtained in step 1.2 is subjected to high-temperature evaporation treatment to obtain process product III in a non-flowing gel state;

[0049] 1.4 Carry out high-temperature drying treatment on the process product III obtained in step 1.3 to obtain the process product IV in a dry gel state, the drying treatment temperature is 120 ℃, and the dryi...

Embodiment 2

[0065] A way to improve La 1-x Ca x Sr y MnO 3 The method of base polycrystalline ceramic electric transport performance includes the following steps:

[0066] 1. La 0.85 Ca 0.15 Sr 0.03 MnO 3 Base powder synthesis:

[0067] 1.1 Weigh 0.85mol La(NO 3 ) 3 , 0.15mol Ca(NO 3 ) 2 , 0.03mol Sr(NO 3 ) 2 , 1mol Mn(NO 3 ) 2 And 4mol citric acid, sequentially poured into deionized water and coordinated with synchronous stirring to obtain Process I;

[0068] 1.2 Add 8 mL of ethylene glycol (the volume ratio of ethylene glycol to process I is 4%) to process product I obtained in step 1.1 to obtain process product II;

[0069] 1.3 The process product II obtained in step 1.2 is subjected to high-temperature evaporation treatment to obtain process product III in a non-flowing gel state, and the flow state of process product III is used as the reaction stop criterion;

[0070] 1.4 The process product III obtained in step 1.3 is subjected to high-temperature drying treatment to obtain the process produ...

Embodiment 3

[0086] A way to improve La 1-x Ca x Sr y MnO 3 The method of base polycrystalline ceramic electric transport performance includes the following steps:

[0087] 1. La 0.685 Ca 0.315 Sr 0.06 MnO 3 Base powder synthesis:

[0088] 1.1 Weigh 0.685mol La(NO 3 ) 3 , 0.315mol Ca(NO 3 ) 2 , 0.06mol Sr(NO 3 ) 2 , 1mol Mn(NO 3 ) 2 And 5mol citric acid, sequentially poured into deionized water and coordinated with synchronous stirring to obtain Process I;

[0089] 1.2 Drop 10 mL of ethylene glycol (the volume ratio of ethylene glycol to process product I is 5%) to process product I obtained in step 1.1 to obtain process product II;

[0090] 1.3 The process product II obtained in step 1.2 is subjected to high-temperature evaporation treatment to obtain process product III in a non-flowing gel state, and the flow state of process product III is used as the reaction stop criterion;

[0091] 1.4 The process product III obtained in step 1.3 is subjected to high-temperature drying treatment to obtain the...

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Abstract

The invention discloses a method for improving the electrical transport property of La(1-x)CaxSryMnO3-based polycrystalline ceramic, which can improve the electrical transport property of perovskite polycrystalline ceramic through excellent electrical conductivity of graphene. The method comprises the steps as follows: synthesis of La(1-x)CaxSryMnO3 matrix powder, preparation of a synthetic phasematerial and preparation of the polycrystalline ceramic. The resistance of the prepared polycrystalline ceramic is reduced, so that the TCR (temperature coefficient of resistance) is increased, the metal-insulator transformation temperature (Tp) is closer to the room temperature, and the polycrystalline ceramic can be more widely applied to near-room-temperature electronic devices, CMR (colossal magnetoresistance) bolometers, infrared detectors and other devices.

Description

Technical field [0001] The invention relates to a method for improving the electrical transport performance of polycrystalline ceramics, in particular to a method for improving La 1- x Ca x Sr y MnO 3 A method based on the electrical transport performance of polycrystalline ceramics belongs to the technical field of electronic ceramics. Background technique [0002] Perovskite structure manganese oxide R 1-x A x MnO 3 With super giant magnetoresistance effect (CMR) and other excellent physical properties, it has important application value in sensitive devices such as resistive sensors, spintronic devices, magnetic recording and bolometers. La 1-x Ca x MnO 3 And La 1-x Sr x MnO 3 As R 1-x A x MnO 3 The important members of the system have high TCR (temperature coefficient of resistance) and low T p (Metal-insulation transition temperature) and high T p The characteristics of low TCR make its application in sensitive devices more economical and advantageous. [0003] However, the cu...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/626
CPCC04B35/50C04B35/62605C04B2235/96C04B2235/3262C04B2235/425C04B2235/3208C04B2235/3213
Inventor 刘翔刘阳孙涛
Owner KUNMING UNIV OF SCI & TECH
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