X-ray Diffraction Study of a Large-Scale and High-Density Array of One-Dimensional Crystalline Tantalum Pentoxide Nanorods

被引：36

作者：

Devan, Rupesh S. ^{[1
]}

Ho, Wei-Der ^{[1
]}

Lin, Jin-Han ^{[1
]}

Wu, Sheng Yuri ^{[1
]}

Ma, Yuan-Ron ^{[1
]}

Lee, Ping-Chung ^{[2
]}

Liou, Yung ^{[2
]}

机构：

[1] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

来源：

CRYSTAL GROWTH & DESIGN | 2008年 / 8卷 / 12期

关键词：

D O I：

10.1021/cg800369s

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this study we synthesized a new morphological form of tantalum pentoxide (Ta2O5), one-dimensional (1D) nanorod arrays, via hot filament metal vapor deposition. Field-emission scanning electron microscopy (FESEM) showed the 1D Ta2O5 nanorods to be arranged in a large-area and high-density array about 20-25 nm wide and approximately 500 nm long. Energy dispersive spectroscopy (EDS) analysis verified the presence of only the elements Ta and O. X-ray diffractometry (XRD) revealed the crystalline nature of the 1D Ta2O5 nanorods, which included the tetragonal (alpha) phase and orthorhombic (beta) phases at a low temperature of 80 K. The XRD patterns of the 1D Ta2O5 nanorods indicated complex, polymorphic thermochromic phase transformations, which incorporate: (i) alpha to alpha (alpha-alpha); (ii) alpha-alpha-beta (iii) beta to beta (beta-beta); (iv) beta to alpha (beta-alpha); and (v) alpha-beta-alpha phase transitions at elevated temperatures ranging from 80 to 750 K.

引用

页码：4465 / 4468

页数：4

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