TY - JOUR
T1 - Morphology and crystal phase evolution of GeO 2 in liquid phase deposition process
AU - Jing, Chengbin
AU - Sun, Wei
AU - Wang, Wei
AU - Li, Yi
AU - Chu, Junhao
PY - 2012/1/1
Y1 - 2012/1/1
N2 - Morphology and crystal phase evolution of GeO 2 in liquid phase deposition (LPD) process is investigated. Rod-like solid phases precipitate out of solution ahead of truncated cube-like phases. SEM, XRD and TEM analyses reveal that the two sorts of solid phases are tetragonal GeO 2 and hexagonal GeO 2, respectively. The tetragonal GeO 2 phases start to experience a re-dissolving process as soon as the hexagonal phases come into being. The prior precipitation of the rod-like phase arises from a relatively low solute saturation of tetragonal GeO 2. Fast growth of a tetragonal GeO 2 phase along [111] direction leads to development of a rod-like shape. The re-dissolving phenomenon does not agree with the classic growth kinetics of crystals but is strongly favored by our calculations based on thermodynamics. The GeO 2 solutes are released in a fluctuant way by germanate ions, which promotes the occurrence of the re-dissolution phenomenon. The current researches open a door for room-temperature LPD growth of not only the hexagonal GeO 2 particles and film but also the one-dimensional tetragonal GeO 2 product.
AB - Morphology and crystal phase evolution of GeO 2 in liquid phase deposition (LPD) process is investigated. Rod-like solid phases precipitate out of solution ahead of truncated cube-like phases. SEM, XRD and TEM analyses reveal that the two sorts of solid phases are tetragonal GeO 2 and hexagonal GeO 2, respectively. The tetragonal GeO 2 phases start to experience a re-dissolving process as soon as the hexagonal phases come into being. The prior precipitation of the rod-like phase arises from a relatively low solute saturation of tetragonal GeO 2. Fast growth of a tetragonal GeO 2 phase along [111] direction leads to development of a rod-like shape. The re-dissolving phenomenon does not agree with the classic growth kinetics of crystals but is strongly favored by our calculations based on thermodynamics. The GeO 2 solutes are released in a fluctuant way by germanate ions, which promotes the occurrence of the re-dissolution phenomenon. The current researches open a door for room-temperature LPD growth of not only the hexagonal GeO 2 particles and film but also the one-dimensional tetragonal GeO 2 product.
KW - A1. Crystal morphology
KW - A1. Low dimensional structures
KW - A2. Growth from solutions
KW - B1. Inorganic compounds
KW - B1. Oxides
KW - B2. Dielectric materials
UR - https://www.scopus.com/pages/publications/84655160876
U2 - 10.1016/j.jcrysgro.2011.11.024
DO - 10.1016/j.jcrysgro.2011.11.024
M3 - 文章
AN - SCOPUS:84655160876
SN - 0022-0248
VL - 338
SP - 195
EP - 200
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1
ER -