Unlock instant, AI-driven research and patent intelligence for your innovation.

A method to improve the electrical transport performance of polycrystalline ceramics

An electrical transport and ceramic technology, which is applied in the fields 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, and changes in the phase structure of ceramics. and other problems, to achieve the effect of being beneficial to popularization and commercial use, ensuring product quality, and improving ceramic life.

Active Publication Date: 2021-05-14
KUNMING UNIV OF SCI & TECH
View PDF8 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method to improve the electrical transport performance of polycrystalline ceramics
  • A method to improve the electrical transport performance of polycrystalline ceramics
  • A method to improve the electrical transport performance of polycrystalline ceramics

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 for electrical transport performance of base polycrystalline ceramics, comprises the following steps:

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

[0046] 1.1 Weigh 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, poured into deionized water in turn and coordinated with synchronous stirring to obtain the process product Ⅰ;

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

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

[0049] 1.4 Perform high-temperature drying treatment on the process product III obtained in step 1.3 to obtain dry gel state process product IV, the drying treatment te...

Embodiment 2

[0065] A way to improve La 1-x Ca x Sr y MnO 3 The method for electrical transport performance of base polycrystalline ceramics, comprises the following steps:

[0066] 1. La 0.85 Ca 0.15 Sr 0.03 MnO 3 Matrix 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, poured into deionized water in turn and coordinated with synchronous stirring to obtain the process product Ⅰ;

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

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

[0070] 1.4 Perform high-temperature drying treatment on the proces...

Embodiment 3

[0086] A way to improve La 1-x Ca x Sr y MnO 3 The method for electrical transport performance of base polycrystalline ceramics, comprises the following steps:

[0087] 1. La 0.685 Ca 0.315 Sr 0.06 MnO 3 Matrix 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, poured into deionized water in turn and coordinated with synchronous stirring to obtain the process product Ⅰ;

[0089] 1.2 Add 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 Perform high-temperature evaporation treatment on the process product II obtained in step 1.2 to obtain the process product III in a non-flowing gel state, and the flow state of the process product III is used as the criterion for stopping the reaction;

[0091] 1.4 Carry out high-temperature drying treatment on th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for improving La 1‑x Ca x Sr y MnO 3 Based on the method of electrical transport properties of polycrystalline ceramics, the electrical transport properties of perovskite polycrystalline ceramics are improved through the excellent conductivity of graphene. The method of the present invention comprises: La 1‑x Ca x Sr y MnO 3 Matrix powder synthesis, synthetic phase material preparation, and polycrystalline ceramic preparation. The resistance of the polycrystalline ceramics prepared by the present invention is reduced, thereby causing the temperature coefficient of resistance (TCR) to increase, and the metal-insulator transition temperature (T p ) is closer to room temperature, and can be more widely used in near room temperature magnetoelectronic devices, giant magnetoresistance bolometers (Bolometer), infrared detectors and other devices.

Description

technical field [0001] The present invention relates to a kind of method that improves polycrystalline ceramic electrical transport performance, particularly relates to a kind of method that improves La 1- x Ca x Sr y MnO 3 The invention discloses a method for the electrical transport performance of polycrystalline ceramics, belonging 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 Important members of the system, respectively 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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/626
CPCC04B35/50C04B35/62605C04B2235/3208C04B2235/3213C04B2235/3262C04B2235/425C04B2235/96
Inventor 刘翔刘阳孙涛
Owner KUNMING UNIV OF SCI & TECH