Abstract
For many decades, zero thermal expansion materials have been the focus of numerous investigations because of their intriguing physical properties and potential applications in high-precision instruments. Different strategies, such as composites, solid solution and doping, have been developed as promising approaches to obtain zero thermal expansion materials. However, microstructure controlled zero thermal expansion behavior via interface or surface has not been realized. Here we report the observation of an impressive zero thermal expansion (volumetric thermal expansion coefficient, −1.41 × 10−6 K−1, 293–623 K) in single-crystal ferroelectric PbTiO3 fibers with large-scale faceted and enclosed mesopores. The zero thermal expansion behavior is attributed to a synergetic effect of positive thermal expansion near the mesopores due to the oxygen-based polarization screening and negative thermal expansion from an intrinsic ferroelectricity. Our results show that a fascinating surface construction in negative thermal expansion ferroelectric materials could be a promising strategy to realize zero thermal expansion.
Highlights
For many decades, zero thermal expansion materials have been the focus of numerous investigations because of their intriguing physical properties and potential applications in high-precision instruments
Most of the materials expand with the increase of temperature, which is commonly referred as positive thermal expansion (PTE)
It is widely accepted that the thermal expansion is mainly determined by the intrinsic electronic, ferroelectric, or magnetic properties that are sensitive to the microstructure of the materials[5,6,17], the influence of surface or interface on the thermal expansion has not been fully explored
Summary
Zero thermal expansion materials have been the focus of numerous investigations because of their intriguing physical properties and potential applications in high-precision instruments. The zero thermal expansion behavior is attributed to a synergetic effect of positive thermal expansion near the mesopores due to the oxygen-based polarization screening and negative thermal expansion from an intrinsic ferroelectricity. As a typical perovskite ferroelectric material, PbTiO3 (PTO) has been reported to exhibit a NTE performance with the thermal expansion coefficient (TEC) of −1.99 × 10−5 K−1 in a wide temperature range from room temperature to Curie temperature (298–763 K)[18]. The ZTE performance of PTO fibers is attributed to a synergetic effect of PTE near the mesopores due to the polarization screening and NTE from an intrinsic ferroelectricity
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