Transcription of Structural Theories of Glass Formation - Missouri …
{{id}} {{{paragraph}}}
Example: bachelor of science
Structural Theories of Glass Formation - Missouri …
Cer103 NotesShelby chapter BrowGlass structure (1) Structural Theories of Glass FormationZachariasen's Random Network Theory- 1932 (see Shelby pp. 7-10) Before Zachariasen, Glass structures wereconsidered to be comprised of nanocrystals-~20 size- estimated from broadening ofdiffraction patterns: 'breadth'~ /(t cos ),where is the x-ray wavelength, t is theparticle size, the Bragg angle. Problems: Glass densities are too small( 10%) and no SAXS in diffraction patternBragg's Law describes the conditions for constructive interference, and so theangle of incident x-rays that will produce intense diffraction peaks. Otherdiffraction angles will lead to destructive interference. The angle is related to thewavelength of the incident x-rays ( ) and the lattice (crystallographer) noted similar mechanical properties (elasticmodulus, etc.) between glasses and crystals and so expected similar structuralenergies similar underlying atomistic building blocks (cation polyhedra).
Cer103 Notes Shelby Chapter 5 5-2 R.K. Brow Glass Structure (1) Glasses possess a Continuous Random Network Glasses and crystals have the same building blocks (cation polyhedra) arranged
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document:
Related search queries
CHAPTER, CHEMICAL BONDING AND CHEMICAL STRUCTURE, Atomic, Chapter 2: Atomic Structure and Chemical Bonding, Chapter 2, 2 CLASSICAL THEORIES OF CHEMICAL BONDING, Introduction to, Bonding, Structure, Introduction to Materials Science, Chapter, 2 Introduction to Materials Science, Chapter, INTRODUCTION TO ORGANIC, 2 Bonding, Organic Chemistry, Free High School Science Texts: A Textbook, NATIONAL DIPLOMA: ANALYTICAL CHEMISTRY, NATIONAL DIPLOMA: ANALYTICAL CHEMISTRY Qualification code