Unique Growth Pathway in Solution–Solid–Solid Nanowires: Cubic to Hexagonal Phase Transformation

Herein, a thin film of hexagonal-phase NaGdF4:Yb–Er is fabricated by electro-deposition at moderate temperatures. The phase of NaGdF4:Yb–Er thin film can be controlled by adding PVP in the electrolyte.

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Influence of Cubic-to-Hexagonal-Phase Transformation on the Uniformity of NaLnF4 (Ho, Tb, Eu, Sm) Nanoparticles

Chemistry of Materials ◽

10.1021/acs.chemmater.9b03421 ◽

2019 ◽

Vol 31 (23) ◽

pp. 9742-9749

Author(s):

Elsa Lu ◽

Jothirmayanantham Pichaandi ◽

Chandresh Kumar Rastogi ◽

Loryn P. Arnett ◽

Mitchell A. Winnik

Keyword(s):

Phase Transformation ◽

Hexagonal Phase

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Restitution conditions of the parent cubic texture from the inherited hexagonal texture in the β–α phase transformation

Journal of Applied Crystallography ◽

10.1107/s0021889898009297 ◽

1999 ◽

Vol 32 (1) ◽

pp. 21-26 ◽

Cited By ~ 5

Author(s):

Michel Humbert ◽

Nathalie Gey

Keyword(s):

Phase Transformation ◽

Distribution Function ◽

Correlation Function ◽

Room Temperature ◽

Hexagonal Phase ◽

Parent Phase ◽

Orientation Distribution ◽

Variant Selection ◽

Qualitative Information ◽

Α Phase

Different factors calculated from theCcoefficients of the inherited orientation distribution function (ODF) allow us to check the importance of the variant selection. When no variant selection or a slight variant selection occurs by the cubic-to-hexagonal phase transformation, it is possible to calculate the ODF of the cubic parent phase present at high temperature from the ODF of the inherited hexagonal phase at room temperature. When a stronger variant selection occurs, qualitative information about the parent ODF can be obtained by using a specific correlation function, which we have named R(g).

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Control of morphology in synthesizing mesoporous silica

Pure and Applied Chemistry ◽

10.1351/pac200072010137 ◽

2000 ◽

Vol 72 (1-2) ◽

pp. 137-146 ◽

Cited By ~ 60

Author(s):

Chung-Yuan Mou ◽

Hong-Ping Lin

Keyword(s):

Phase Transformation ◽

Liquid Crystal ◽

Nitric Acid ◽

Mesoporous Silica ◽

Hexagonal Phase ◽

Silicate Liquid ◽

Morphological Transformation ◽

Liquid Crystal System ◽

Surfactant Composition ◽

Morphological Transformations

Mesoporous silica can be synthesized by either the alkaline route or the acidic route, both using surfactants as templates. Morphological transformations of mesoporous silica can produce various hierarchical orders. Different morphologies are produced under different synthetic conditions. In the alkaline route, the surfactant/silicate liquid crystal system undergoes phase transformation to form vesicles and further transforms to the hexagonal phase. The results are tubule-within-tubule and hollow pillar-within-sphere structures depending on cosurfactant/surfactant composition. Using nitric acid in the acidic route, one can obtain hierarchical ropes or gyroids depending on stirring conditions. Ammonia hydrothermal treatment can induce further morphological transformation to nanotubes of mesoporous silica.

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