@inproceedings{87749e962aa74a85ab797209ff1e6cd2,
title = "Germanium nanocrystals embedded in sapphire",
abstract = "74Ge nanocrystals are formed in a sapphire matrix by ion implantation followed by thermal annealing. Transmission electron microscopy (TEM) of as-grown samples reveals that the nanocrystals are faceted and have a bi-modal size distribution. Notably, the matrix remains crystalline despite the large implantation dose and corresponding damage. Embedded nanocrystals experience large compressive stress relative to bulk, as measured by Raman spectroscopy of the zone center optical phonon. In contrast, ion-beam-synthesized nanocrystals embedded in silica are observed to be spherical and experience considerably lower stresses. Also, in situ TEM reveals that nanocrystals embedded in sapphire melt very close to the bulk melting point (Tm= 936 %C) whereas those embedded in silica exhibit a significant melting point hysteresis around Tm.",
author = "Q. Xu and Sharp, {I. D.} and Liao, {C. Y.} and Yi, {D. O.} and Ager, {J. W.} and Beeman, {J. W.} and Yu, {K. M.} and Chrzan, {D. C.} and Haller, {E. E.}",
year = "2005",
doi = "10.1557/proc-880-bb5.22",
language = "English",
isbn = "1558998349",
series = "Materials Research Society Symposium Proceedings",
publisher = "Materials Research Society",
pages = "115--120",
booktitle = "Mechanical Properties of Nanostructured Materials",
note = "2005 MRS Spring Meeting ; Conference date: 28-03-2005 Through 01-04-2005",
}