TITLE

In situ x-ray diffraction study on AgI nanowire arrays

AUTHOR(S)
Wang, Yinhai; Ye, Changhui; Wang, Guozhong; Zhang, Lide; Liu, Yanmei; Zhao, Zhongyan
PUB. DATE
June 2003
SOURCE
Applied Physics Letters;6/16/2003, Vol. 82 Issue 24, p4253
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The AgI nanowire arrays were prepared in the ordered porous alumina membrane by an electrochemical method. Transmission electron microscopy observation shows that the AgI nanowires are located in the channels of the alumina membrane. In situ x-ray diffractions show that the nanowire arrays possess hexagonal close-packed structure (β-AgI) at 293 K, orienting along the (002) plane, whereas at 473 K, the nanowire arrays possess a body-centered cubic structure (α-AgI), orienting along the (110) plane. The AgI nanowire arrays exhibit a negative thermal expansion property from 293 to 433 K, and a higher transition temperature from the β to α phase. We ascribe the negative thermal expansion behavior to the phase transition from the β to α phase, and the elevated transition temperature to the radial restriction by the channels of alumina membrane.
ACCESSION #
9987405

 

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