λ-Ti3O5粉体的制备及其光存储性能的研究

doi:10.3724/SP.J.1077.2013.12309

无机材料学报 ›› 2013, Vol. 28 ›› Issue (4): 425-430.DOI: 10.3724/SP.J.1077.2013.12309 CSTR: 32189.14.SP.J.1077.2013.12309

λ-Ti₃O₅粉体的制备及其光存储性能的研究

刘刚¹, 黄婉霞¹, 易勇²

(1. 四川大学材料科学与工程学院, 成都 610064; 2. 西南科技大学极端条件物质特性实验室, 绵阳 621010)

收稿日期:2012-05-11 修回日期:2012-07-17 出版日期:2013-04-10 网络出版日期:2013-03-20
作者简介:刘刚(1988–), 男, 硕士研究生. E-mail: liugangscu@163.com
基金资助:
极端条件物质特性实验室基金(11zxjk01) Open Foundation of Laboratory for Extreme Conditions Matter Properties (11zxjk01)

Preparation and Optical Storage Properties of λTi₃O₅ Powder

LIU Gang¹, HUANG Wan-Xia¹, YI Yong²

(1. Materials Science and Engineering College, Sichuan University, Chengdu 610064, China; 2. Laboratory of Matter Characteristic Research at Extreme Conditions, Southwest University of Science and Technology, Mianyang 621010, China)

Received:2012-05-11 Revised:2012-07-17 Published:2013-04-10 Online:2013-03-20
About author:LIU Gang. E-mail: liugangscu@163.com

摘要/Abstract

摘要：

采用氢气还原纳米TiO₂粉体制备了Ti₃O₅粉体, 采用FTIR、XRD、SEM、UV-Vis等对原料及产物进行了表征。结果表明: 加大通氢流量有利于还原反应的进行; 以氧化硅包覆的纳米TiO₂粉体(金红石型)为原料, 1150℃下氢气还原1 h可合成单一物相组成的λ-Ti₃O₅粉体。对比自制未包覆处理的纳米TiO₂, TiO₂粉体的氧化硅包覆处理有利于λ-Ti₃O₅的形成; λ-Ti₃O₅与β-Ti₃O₅有较高的光学对比度, 室温下, 经适当的纳秒脉冲激光(532 nm, 20 ns)处理, λ-Ti₃O₅会向β-Ti₃O₅发生转变, 表现出较好的光存储性能。

关键词: λ, -Ti₃O₅, 粉体, 还原, 纳米TiO₂, 光存储

Abstract:

The Ti₃O₅ powder was prepared by reducing TiO₂ nanopartical in H₂ atmosphere. The samples were investigated by powder X-ray diffraction (XRD), Fourier transform infrared spectroscope (FTIR), scanning electron microscope (SEM) and UV-Vis diffusion reflectance spectra (UV-Vis). The results show that, single phase Ti₃O₅ can be obtained by increasing the H₂ flow. When H₂ flow increases from 0.3 mL/min to 0.8 mL/min, the single phase λ-Ti₃O₅ can be synthesized using SiO₂-coated TiO₂ (rutile, nanoparticle) as raw material at 1150℃ for 1 h. While using nano-TiO₂ powders without SiO₂-coated as raw material, the reduction product is multiphases composed of λ-Ti₃O₅ and β-Ti₃O₅. There is a high reflectivity contrast between λ-Ti₃O₅ and β-Ti₃O₅. When the multiphases sample is irradiated with 532 nm 20 ns-pulsed laser light at room temperature, Ti₃O₅ will transit from α phase to β phase, which shows a good optical storage performance.

Key words: &#x003bb, -Ti₃O₅, powder, reduction, nano-TiO₂, optical storage

中图分类号:

TB383

刘刚, 黄婉霞, 易勇. λ-Ti₃O₅粉体的制备及其光存储性能的研究[J]. 无机材料学报, 2013, 28(4): 425-430.

LIU Gang, HUANG Wan-Xia, YI Yong. Preparation and Optical Storage Properties of λTi₃O₅ Powder[J]. Journal of Inorganic Materials, 2013, 28(4): 425-430.

图/表 11

图1 不同温度下反应吉布斯函变与压力商的关系

Fig. 1 Relationship of Gibbs free energy and pressure quotient at different temperature

图2 不同温度下H2还原氧化硅包覆TiO2粉体(金红石)的XRD图谱

Fig. 2 XRD patterns of the SiO2-coated TiO2 powder (rutile) after reduction in H2 atmosphere at different temperatures for 1 h

图3 不同保温时间下H2还原氧化硅包覆TiO2粉体(金红石)的XRD图谱

Fig. 3 XRD patterns of the SiO2-coated TiO2 powder(rutile) after reduction in H2 atmosphere at 1150℃ for different time

Table 1 Effect of raw material and H2 flow on the composition of reduction product

Number	TiO₂	T/℃ t/h	H₂/(L·min^-1)	Composition
1	A	1150 1	0.3	Ti₄O₇,Ti₃O₅
2	R	1150 1	0.3	Ti₄O₇,Ti₃O₅
3	A	1150 1	0.8	Ti₃O₅
4	R	1150 1	0.8	Ti₃O₅

图4 不同纳米TiO2粉体的红外光谱图

Fig. 4 IR spectra of different nano-TiO2

图5 不同纳米TiO2粉体的SEM照片

Fig. 5 SEM images of different nano-TiO2

图6 不同TiO2的氢还原产物的XRD图谱

Fig. 6 XRD patterns of the different nano-TiO2 after reduction in H2 atmosphere at 1150℃ for 1 h

图7 不同TiO2为原料氢还原制备的Ti3O5的SEM照片

Fig. 7 SEM images of different TiO2 powder after reduction in H2 atmosphere at 1150℃ for 1 h

图8 不同相结构的Ti3O5的反射率曲线

Fig. 8 Wavelength dependence of reflection difference between the β-Ti3O5 and λ-Ti3O5

Table 2 Reflectivity contrast between β-Ti3O5(R1) and λ-Ti3O5(R2)

Wavelength/nm	R₁/%	R₂/%	C/%
310	27.8	11.9	79.9
350	12.7	6.0	71.1
480	9.0	4.7	62.1
750	6.6	2.8	82.1

图9 激光处理前后Ti3O5粉体的XRD图谱

Fig. 9 XRD patterns of the Ti3O5 powder before and after 532 nm laser light irradiation at room temperature

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λ-Ti₃O₅粉体的制备及其光存储性能的研究

Preparation and Optical Storage Properties of λTi₃O₅ Powder

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