The Negative Thermal Expansion Property of NdMnO3 Based on Pores Effect and Phase Transition

A novel negative thermal expansion (NTE) material NdMnO 3 was synthesized by solid-state method at 1 523 K. The crystal structure, phase transition, pores effect and negative expansion properties of NdMnO 3 were investigated by variable temperature X-ray diffraction (XRD), scanning electron microsco...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2024-02, Vol.39 (1), p.39-43
Main Authors: Li, Yucheng, Zhang, Yang, Zhang, Muqun, Duan, Rong, Liu, Xiteng
Format: Article
Language:English
Subjects:
Advanced Materials
Chemistry and Materials Science
Crystal structure
Materials Science
Phase transitions
Raman spectra
Thermal expansion
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Summary:A novel negative thermal expansion (NTE) material NdMnO 3 was synthesized by solid-state method at 1 523 K. The crystal structure, phase transition, pores effect and negative expansion properties of NdMnO 3 were investigated by variable temperature X-ray diffraction (XRD), scanning electron microscope (SEM) and variable temperature Raman spectra. The compound exhibits NTE properties in the orderly O′ phase crystal structure. When the temperature is from 293 to 759 K, the ceramic NdMnO 3 shows negative thermal expansion of −4.7×10 −6 /K. As temperature increases, the ceramic NdMnO 3 presents NTE property range from 759 to 1 007 K. The average linear expansion coefficient is −18.88×10 −6 /K. The physical mechanism of NTE is discussed and clarified through experiments.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-024-2852-3