Dendritic crystal growth in pure /sup 4/He
Journal Article
·
· J. Low Temp. Phys.; (United States)
Dendritic crystal growth of pure hcp and fcc /sup 4/He was observed at pressures between 210 and 6500 bar. Dendrite morphology depends on fluid supercooling and crystal phase. At large supercooling, dendrites with side arms are observed, whereas at low supercooling dendrites grow without side arms. The morpholpogy of hcp /sup 4/He dendrites is strongly influenced by crystalline anisotropy. Comparison with present theories of dendrite growth show good agreement with the power law dependencies of velocity, tip radius, and Peclet number on supercooling. Numerically, theory predicts much larger velocities than are observed. The stability parameter sigma is found to be much smaller than theoretically predicted.
- Research Organization:
- Univ of Alberta, Alberta
- OSTI ID:
- 7151718
- Journal Information:
- J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 64:3/4; ISSN JLTPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
640450 -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COOLING
COOLING SYSTEMS
CRYSTAL GROWTH
CRYSTAL GROWTH METHODS
CRYSTAL LATTICES
CRYSTAL MODELS
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DENDRITES
DENDRITIC WEB GROWTH METHOD
DIFFUSION
ENERGY SYSTEMS
EVEN-EVEN NUCLEI
FCC LATTICES
HCP LATTICES
HELIUM 4
HELIUM ISOTOPES
HEXAGONAL LATTICES
ISOTOPES
KINETICS
LIGHT NUCLEI
MATHEMATICAL MODELS
NUCLEI
PRESSURE DEPENDENCE
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THERMAL DIFFUSION
360603* -- Materials-- Properties
640450 -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COOLING
COOLING SYSTEMS
CRYSTAL GROWTH
CRYSTAL GROWTH METHODS
CRYSTAL LATTICES
CRYSTAL MODELS
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DENDRITES
DENDRITIC WEB GROWTH METHOD
DIFFUSION
ENERGY SYSTEMS
EVEN-EVEN NUCLEI
FCC LATTICES
HCP LATTICES
HELIUM 4
HELIUM ISOTOPES
HEXAGONAL LATTICES
ISOTOPES
KINETICS
LIGHT NUCLEI
MATHEMATICAL MODELS
NUCLEI
PRESSURE DEPENDENCE
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
THERMAL DIFFUSION