CaCeNbWO8-based high-entropy negative temperature coefficient thermal sensitive ceramic material and preparation method thereof

By doping CaCeNbWO8-based high-entropy negative temperature coefficient thermosensitive ceramic materials with A-position doping Sm, Eu, La, Ho or Dy, the temperature range of the material is expanded to 200℃ ~ 1100℃, solving the problems of insufficient high-temperature stability and resistivity of existing materials, and achieving excellent aging stability and sensitivity at high temperatures.

CN120365067APending Publication Date: 2025-07-25XINJIANG TECH INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202510599202.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-10
Publication Date
2025-07-25

AI Technical Summary

Technical Problem

The Ca-Ce-Nb-W-O-based ceramic material with the existing sedraelite structure has a low melting point and a small high-temperature resistivity, resulting in the maximum upper limit temperature of only 700℃, limiting its application environment.

Method used

The temperature range of the material is expanded by using CaCeNbWO8-based high entropy negative temperature coefficient thermosensitive ceramic material, through A-position doping Sm, Eu, La, Ho or Dy, and the high temperature stability of the material is improved through specific preparation methods.

Benefits of technology

The temperature range of the material is expanded to 200℃ ~ 1100℃, and high sensitivity and excellent aging stability are maintained at high temperatures, with resistance drift rate less than 3.49 ± 0.03%.

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Abstract

The invention discloses a CaCeNbWO8-based high-entropy negative temperature coefficient thermal sensitive ceramic material and a preparation method thereof, belongs to the field of negative temperature coefficient thermistors, and aims to expand the temperature zone range of a scheelite structure negative temperature coefficient thermal sensitive ceramic material. The material is prepared by mixing and firing raw materials including calcium carbonate, cerium dioxide, tungsten oxide, niobium pentoxide, samarium oxide, europium oxide, lanthanum trioxide, holmium oxide or dysprosium oxide according to a stoichiometric ratio, the chemical formula is (Ca1 / 3Ce1 / 3M1 / 3) (Nb1 / 2W1 / 2) O4, and M is Sm, Eu, La, Ho or Dy; the electrical property parameters of the thermal sensitive ceramic material with the negative temperature coefficient are as follows: B200 DEG C / 1100 DEG C is equal to 6081-7210 + / -1.8% K, rho1100 DEG C is equal to 2.87 * 10 < 3 >-4.09 * 10 < 3 > + / -1.37% omega.cm, and the applicable temperature range is 200-1100 DEG C. The material has a wide temperature range of 200-1100 DEG C, can maintain high sensitivity at a high temperature due to a large material constant B value, and shows excellent aging stability at 1000 DEG C. Through measurement, the resistance drift rate of the thermal sensitive ceramic material with the negative temperature coefficient is less than 3.49 + / -0.03% after the thermal sensitive ceramic material is aged at 1000 DEG C for 500 hours.
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