Congtical Laboratory | Study on Temperature-Variable Resistivity Characteristics of New Materials

In the vast field of materials science, the research and development of new materials have always been the core driving force for technological progress. Temperature-variable resistivity testing experiments are of great significance for deeply understanding the electrical properties, doping status, structural changes, and semiconductor characteristics of materials.

Therefore, this experiment of Congtical Laboratory focuses on the 1000°C temperature-variable resistivity test of new materials, aiming to uncover the electrical characteristics of a certain component silicon carbide fiber membrane material at high temperatures together with you.

1. Testing Equipment and Principles

(1)1000°C Temperature-Variable Resistivity Test Bench

Adopts an advanced PID temperature control meter to control a specially designed heating rod, with excellent precise temperature control capabilities. The temperature display accuracy reaches 0.1°C, and the temperature control accuracy is as high as ±0.1°C, ensuring stable temperature within a minimal error range throughout the test.

In terms of temperature variation speed, the heating rate can be programmed within 1–150°C/min.

(2)Water-Cooled Circulation System

Cools the chamber shell through water circulation to ensure the testing equipment operates in a stable temperature environment and reduces interference from external factors on test results.

(3)Hioki RM3545 Resistance Meter

Instantly and accurately measures the resistivity of samples at different temperatures.

(4)Integrated Software

Achieves unified control and management of all instruments through a simple and efficient operation interface, and automatically generates charts and reports based on test data.

(5) Test Sample

A certain component silicon carbide fiber membrane material.

(5) Test Principle: Four-Probe Method

Conductive material π-type four-wire method—suitable for measuring the bulk resistance of metal and superconducting materials.

2.Experimental Preparation

Before testing, preparation work is crucial, as every detail affects the accuracy and reliability of subsequent tests.

Sample Selection: Consider the doping type and concentration to ensure the sample accurately reflects the resistance characteristic changes of such materials under temperature-variable conditions.

Instrument Debugging: Comprehensively inspect and calibrate all instruments, including temperature calibration of the test bench, water-cooling debugging, resistance meter debugging, and integrated system function testing.

3.Experimental Process

Temperature Range: Room temperature (RT) to 1000°C.

Heating Procedure: First, rapidly heat from room temperature to 1000°C at a rate of 50°C/min, then maintain 1000°C for 5 minutes to stabilize the material at high temperature, ensuring the measured resistivity reflects the true state of the material.

Sample Placement: Place a quartz glass (with good insulation and high-temperature resistance) on the sample stage to isolate the sample from the stage, then place the sample on the quartz glass and press it gently with four probes to ensure good contact.

Parameter Setting: Adjust the Hioki RM3545 resistance meter to an appropriate unit according to sample characteristics and test requirements.

4.Test Results

The research shows that the electrical conductivity of this new material exhibits unique variation laws at different temperatures:

When the temperature rises, the resistivity initially decreases rapidly, and the conductivity significantly enhances, as the increase in temperature increases the number of carriers inside the material and improves electron activity.

When the temperature exceeds a certain level, the decline in resistivity slows down, and even a slight increase occurs in the high-temperature range, possibly due to intensified lattice vibration at high temperatures, which enhances electron scattering and offsets the conductivity improvement brought by the increase in carrier number.

5.Conclusion

This experiment is just one of many material tests. Congtical Laboratory will continue to uphold its innovative spirit and professional attitude to explore the unknown fields of new materials. In the future, it will:

Further optimize existing equipment and technologies to improve research accuracy and efficiency.

Expand research directions to more challenging material systems, such as new superconducting materials and intelligent materials, providing innovative material solutions for key issues in energy, information, environment, and other fields.