Crystalline to non-crystalline transformation of irradiated quartz
Thesis/Dissertation
·
OSTI ID:5912178
The solid-state, irradiation-induced, crystalline to non-crystalline transformation of synthetic ..cap alpha..-quartz was studied during in situ electron irradiation using transmission electron microscopy (TEM). The transformation proceeds in two stages: 1) rapid, heterogeneous nucleation and growth of three-dimensional amorphous inclusions, and 2) more gradual, homogeneous loss of long-range correlations in the surrounding matrix. Both of these processes were studied using convergent beam electron diffraction (CBED), high resolution structure imaging (HRSI), and as a function of temperature from approx.15K to approx.1100K. The nucleation and growth of amorphous inclusions is found to be controlled by temperature dependent point defect migration and aggregation. The amorphization of the matrix, as imaged in TEM, appears to be a surface-initiated process. The structural information obtained from CBED and HRSI indicates that short-range correlations are lost first during transformation; subsequent loss of long-range order occurs through extensive, cooperative rearrangement of the (SiO/sub 4/) coordination tetrahedra.
- Research Organization:
- Case Western Reserve Univ., Cleveland, OH (USA)
- OSTI ID:
- 5912178
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360602 -- Other Materials-- Structure & Phase Studies
360605* -- Materials-- Radiation Effects
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
MICROSCOPY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
QUARTZ
RADIATION EFFECTS
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
STRUCTURE FACTORS
TEMPERATURE DEPENDENCE
TRANSMISSION ELECTRON MICROSCOPY
360602 -- Other Materials-- Structure & Phase Studies
360605* -- Materials-- Radiation Effects
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
LEPTONS
MICROSCOPY
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
QUARTZ
RADIATION EFFECTS
SCATTERING
SILICON COMPOUNDS
SILICON OXIDES
STRUCTURE FACTORS
TEMPERATURE DEPENDENCE
TRANSMISSION ELECTRON MICROSCOPY