Phase evolution and formation of lambda phase in Ti3O5 induced by magnesium doping
Phase evolution and formation of lambda phase in Ti3O5 induced by magnesium doping
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镁掺杂诱导 Ti3O5 中的相演化和 lambda 相的形成
DOI：
10.1016/j.jallcom.2018.09.350
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发表时间：
2019
影响因子：
6.2
通讯作者：
Qiwu Shi
中科院分区：
文献类型：
--
作者：
Mingzhe Wang;Wanxia Huang;Zujia Shen;Junzheng Gao;Yanli Shi;Tiecheng Lu;Qiwu Shi
λ-Ti 3 O 5具有λ-β相的金属-半导体相变（MST）特性，是一种很有应用前景的相变金属氧化物，在光存储、热存储和智能光电器件等方面具有广阔的应用前景。然而，λ-Ti_3O_5是一种室温亚稳相，其合成一直是一个很大的挑战。本文提出了一种Mg掺杂的碳热还原法制备λ-Ti 3 O 5的相控制策略。结果表明，Mg掺杂可以通过调节Mg掺杂量来改变Ti 3 O 5的晶体结构。结果表明，随着Mg添加量的增加，β-λ相的相变温度（Tc）降低，最终稳定在室温下。电阻率测试结果表明，Mg掺杂使Ti 3 O 5的电阻率显著降低，表明Mg掺杂导致了β-λ-α相的演变，原位变温XRD分析证实了Ti 3 O 5的相演变和相变特征。本工作为通过掺杂策略对Ti_3O_5晶体结构的可控改性以及亚稳态λ-Ti_3O_5的稳定化机制提供了重要的见解。
λ-Ti3O5is a promising phase-transition metal oxide for the application in rewritable data storage, heat storage and smart optoelectronic devices due to its bistable metal-semiconductor transition (MST) characteristics between λ and β phase. However, λ-Ti3O5is a room-temperature metastable phase and it's synthesis has been a great challenge. This paper presented a magnesium (Mg)-doping strategy for phase control of Ti3O5to obtain the λ-Ti3O5via carbothermal reduction method. The results revealed that Mg-doping induced a crystal-structure modification in Ti3O5by tuning the Mg-doping content. Particularly, it suggested that the phase-transition temperature (Tc) of β–λ was reduced efficiently by increasing the Mg additive amount, and the λ phase was stabilized at room temperature eventually. Electrical resistivity measurement demonstrated a remarkable decrease in resistivity of Ti3O5, indicating a β–λ–α phase evolution induced by Mg-doping.In-situtemperature-dependent XRD was also employed to confirm the phase evolution and phase-transition characteristic of Ti3O5. This work offered considerable insights into a controllable crystal-structure modification for Ti3O5by a doping strategy and the mechanism to the stabilization of metastable λ-Ti3O5.