Manipulating microstructure and properties of dense rutile TiO2 through dynamic flash phenomena

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-07-12 DOI:10.1016/j.scriptamat.2025.116877

Vikaskumar Mishra , Xavier Vendrell , Devinder Yadav

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Abstract

This study demonstrates manipulation of microstructure and properties in dense polycrystalline rutile TiO₂ via dynamic flash phenomena. The specimen exhibited intense luminescence throughout the gage section in state of flash. Upon removal of specimen from furnace and exposure to ambient conditions, the luminescence front propagated towards anode, leaving a progressively expanding blackened region (at rate of 6 µm/s) on the specimen. Once luminescence front reached anode, the entire section displayed this blackened phase. Subsequently, a new luminescence front initiated at cathode and propagated towards anode at rate of 40 µm/s. This cyclical migration of luminescence front persisted until the electric field was turned-off. Complete luminescence migration yielded a textured, defect-rich, highly reduced microstructure, resulting in significantly increased conductivity compared to conventionally sintered specimen. This dynamic flash method offers a novel approach to tailor microstructure and properties of dense specimens, with implications for resistive switching devices and designing movable p-n junctions.

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利用动态闪光现象调控致密金红石型TiO2的微观结构和性能

本研究展示了通过动态闪光现象操纵致密多晶金红石型TiO2的微观结构和性能。在闪光状态下，试样在整个测量截面上表现出强烈的发光。当样品从炉中取出并暴露在环境条件下时，发光锋向阳极传播，在样品上留下一个逐渐扩大的变黑区域（速率为6 μ m/s）。一旦发光锋到达阳极，整个切片显示这种变黑阶段。随后，一个新的发光锋以40µm/s的速率从阴极开始向阳极传播。这种发光锋的周期性迁移一直持续到电场被关闭。完全的发光迁移产生了有织构的、缺陷丰富的、高度还原的微观结构，与传统烧结试样相比，导致电导率显著提高。这种动态闪光方法提供了一种新的方法来定制致密样品的微观结构和性能，对电阻开关器件和设计可移动pn结具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.