Crystal_Growth_and _Phase_Diagrams

Crystal_Growth_and _Phase_Diagrams - Crystal Growth...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Crystal Growth • “Rock Cycle” = fundamentally controlled by mineralogic changes caused by changing geologic environments - Geologic history of the earth - Geologic processes: * ore deposits * oil and gas * building materials * engineering hazards Mineral Stability Requirements for mineral growth: (1) Constituents (i.e. right elements - X) (2) Stable conditions (P and T) Stability • More stable “position” is one of lower energy • Change may not be spontaneous – metastable • Energy required to overcome metastability – activation energy • Measure of stability in chemical reactions – Gibbs Free Energy – G - Units are energy e.g. Calories or Joules • G always relative to some standard - “free energy of formation from the elements” - G f 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
e.g. Si + O 2 SiO 2 - Difference in G f between 298 K and 1 atm P - G f is a function of P and T different G f if P and T 298 K and 1 atm P Reactions • Mineral Reactions are conversion from one mineral to another: • Stability of reactions determined by G If; • Possible to calculate stability of reactions using algebra above
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/06/2011 for the course GLY 5245 taught by Professor Staff during the Spring '11 term at University of Florida.

Page1 / 7

Crystal_Growth_and _Phase_Diagrams - Crystal Growth...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online