查找使用阿拉丁产品的科研文献

SrCexNbxWO4+4x: A novel NTC ceramic for high-temperature thermistor with a wide temperature range

Xiaohui Li,Xiaoyi Chen,Bo Gao,Yanwei Fan,Yige Wang,Xin Kang,Wenwen Kong,Aimin Chang

A series of novel negative temperature coefficient thermistor materials based on SrCe x Nb x WO 4+4x (0.1 ≤ x ≤ 0.8) ceramics was synthesized by the solid-state route. X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy revealed that the SrCe x Nb x WO 4+4x ceramics were composed of scheelite structural solid solution based on the SrWO 4 phase and a CeNbO 4.08 secondary phase that exhibited a fergusonite structure. The resistance-temperature analysis demonstrated that the resistivity ρ 800 of the SrCe x Nb x WO 4+4x ceramics decreased from 8.25 ± 0.08 × 10 6 to 2.52 ± 0.11 × 10 2 with the increase of x value, along with a decrease in the thermal constant B from 11,102 ± 97–4137 ± 37 K. It was observed that the SrCe x Nb x WO 4+4x ceramics exhibited high resistivity and excellent aging characteristics as well as suitable B values at elevated temperatures, making it a promising candidate that can be used for the fabrication of high-temperature NTC thermistors with a wide operating temperature range.

A novel NTC ceramic based on La2Zr2O7 for high-temperature thermistor

Xiaoyi Chen,Xiaohui Li,Bo Gao,Wenwen Kong,Pengjun Zhao,Aimin Chang

A novel negative temperature coefficient material based on lanthanum zirconate ceramics was proposed for high-temperature applications. This material was synthesized through a solid-state reaction by sintering at 1923 K for 10 h in air. The X-ray diffraction and scanning electron microscopy results confirmed that La 2 Zr 2 O 7 ceramics exhibited a pyrochlore phase with a relative density of 98.2 %. The resistance–temperature characteristics of the material revealed that La 2 Zr 2 O 7 ceramics exhibited an NTC feature within the broad temperature range of 973–1773 K in addition to maintaining high thermal constant B , and resistivity to ensure good sensitivity at high temperatures. These properties, along with high ceiling temperature, unique oxygen insensitivity, and excellent ageing coefficient of <0.7 % at 1773 K, render La 2 Zr 2 O 7 ceramics a promising candidate as thermistor materials with high-temperature NTC.

Fabrication of high-sensitivity Bi0.2-xCexSr0.5La0.3TiO3 (0

CaMnxZr(1-x)O3: A novel NTC thermo-sensitive ceramic for applications in a wide temperature range

Yuyu Liu,Wenye Deng,Xianghui Chen,Yan Xue,Xuelian Bai,Pengjun Zhao,Huimin Zhang,Aimin Chang,Yongxin Xie

The perovskite CaMn x Zr (1- x ) O 3 ( x  = 0, 0.05, 0.10, 0.15) (CMZO) NTC (Negative Thermal Coefficient) thermo-sensitive ceramic were prepared by the solid phase method that can be used as high temperature thermistor materials in the range of 200–1200 °C.The XRD pattern showed that CMZO is a finite solid solution and that a second phase, CaMnO 3 , will be formed after exceeding the solid solution limit (i.e., at x  = 0.1). The thermal constant B value was found to decrease from 19521 K to 9217–9535 K, with a corresponding decrease in activation energy , E a , from 1.69 eV to 0.82 eV. The Nyquist plot indicates that the grain boundary resistance determines the overall complex impedance. Moreover, the aging drift rate (ΔR/R 0 ) was found to be lower than 4.3%, which is an indication of an excellent high temperature stability of the CMZO ceramic material.