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Pressure-dependent phase transformation of PX-PbTiO3 nanowires.

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Title: Pressure-dependent phase transformation of PX-PbTiO3 nanowires.
Authors: Zhang, Hongtao1,2 (AUTHOR) htzhang@hytc.edu.cn, Zhu, Chongyang2 (AUTHOR), Ma, Chunlin1 (AUTHOR), Wu, Xiaohui1 (AUTHOR), Shi, Jiayi1 (AUTHOR), Li, Jiaqi1 (AUTHOR), Zhuang, Yuming1 (AUTHOR), Wu, Minghui1 (AUTHOR), Fan, Wenkai1 (AUTHOR), Sun, Litao1,2 (AUTHOR) slt@seu.edu.cn
Source: Ceramics International. May2026:Part B, Vol. 52 Issue 11, p17179-17185. 7p.
Subjects: Phase transitions, Solid-state phase transformations, Perovskite analysis, Heat treatment, Nanowires, Perovskite, Titanium dioxide
Abstract: Solid state phase transformation of PX-PbTiO 3 has attracted great attention due to its potential for effectively controlling the microstructure and properties of derived materials. However, the mechanisms governing the transformation process are not fully understood. In this study, pressure-dependent phase transformation processes of PX-PbTiO 3 nanowires are observed during heat treatment at distinct atmospheric conditions. Under standard atmospheric pressure, PX-PbTiO 3 transforms into ferroelectric PbTiO 3 at temperatures above 550 °C while retaining the initial chemical composition. Reduced pressure induces incomplete phase transformation and leads to a decrease in the Pb:Ti ratio. At extremely low pressure of 10−7 Pa, most of the Pb volatilize into environment and the PX-PbTiO 3 transforms into monoclinic TiO 2 (B). High temperature provides necessary energy for breakage and rearrangement of connection between Ti–O octahedra whereas adsorbed gas atoms prevent volatilization of Pb. These competing effects underlie the observed pressure-dependent transformation pathways. This work not only enhances the understanding of perovskite structure but also suggests a crystallography engineering strategy to obtain different desired crystal phase from a single precursor. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Solid state phase transformation of PX-PbTiO 3 has attracted great attention due to its potential for effectively controlling the microstructure and properties of derived materials. However, the mechanisms governing the transformation process are not fully understood. In this study, pressure-dependent phase transformation processes of PX-PbTiO 3 nanowires are observed during heat treatment at distinct atmospheric conditions. Under standard atmospheric pressure, PX-PbTiO 3 transforms into ferroelectric PbTiO 3 at temperatures above 550 °C while retaining the initial chemical composition. Reduced pressure induces incomplete phase transformation and leads to a decrease in the Pb:Ti ratio. At extremely low pressure of 10−7 Pa, most of the Pb volatilize into environment and the PX-PbTiO 3 transforms into monoclinic TiO 2 (B). High temperature provides necessary energy for breakage and rearrangement of connection between Ti–O octahedra whereas adsorbed gas atoms prevent volatilization of Pb. These competing effects underlie the observed pressure-dependent transformation pathways. This work not only enhances the understanding of perovskite structure but also suggests a crystallography engineering strategy to obtain different desired crystal phase from a single precursor. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.02.304