Hot Under the Collar (part III) Phase Diagrams

Slides:

Advertisements

Similar presentations

EQUILIBRIUM DIAGRAMS HAVING INTERMEDIATE PHASES OR COMPOUNDS

Advertisements

1 Binary Phase Diagrams GLY 4200 Fall, Binary Diagrams Binary diagrams have two components We therefore usually choose to plot both T (temperature)

Evolution of Igneous Rocks. Simple Eutectic Two components that don’t mix in the solid state One or the other begins to form as melt cools When temperature.

Lecture 18Multicomponent Phase Equilibrium1 Thermodynamics of Solutions Let’s consider forming a solution. Start with X A moles of pure A and X B moles.

Mechanical & Aerospace Engineering West Virginia University Phase Diagram (1)

Phase Equilibria.

Crystal-Melt Equilibria in Magmatic Systems Learning Objectives: –How are crystal-melt equilibria displayed graphically as phase diagrams? –What are the.

CHAPTER 8 Phase Diagrams 8-1.

Class 7. Mantle Melting and Phase Diagrams William Wilcock OCEAN/ESS 410.

Lecture 4. Phase Equilibrium PhD Falfushynska H..

Phase Any physically distinct, chemically homogeneous and mechanically separable portion of a substance Can be continuous or discontinuous Can be solid,

Chapter 6 Interpretation of Phase Diagrams Phase diagrams summarize in graphical form the ranges of temperature (or pressure) and composition over which.

CENG151 Introduction to Materials Science and Selection Phase Diagrams Homework Solutions 2007.

Lecture 7 (9/27/2006) Crystal Chemistry Part 6: Phase Diagrams.

Phase diagram Need to represent how mineral reactions at equilibrium vary with P and T.

Readings: Winter Chapter 6

Review: Binary Phase Diagrams N0zєXAXBN0zєXAXB є =  AB – ½ (  AA +  BB ) , є > 0   AB is large  avoid A-B bonds  clustering, unmixing, phase separation.

Phase Equilibria: Solubility Limit Sucrose/Water Phase Diagram Pure Sugar Temperature (°C) Co=Composition (wt% sugar) L (liquid solution.

Phase Equilibrium At a constant pressure simple compounds (like ice) melt at a single temperature More complex compounds (like silicate magmas) have very.

Eutectic and Peritectic Systems

Phase Equilibrium. Makaopuhi Lava Lake Magma samples recovered from various depths beneath solid crust From Wright and Okamura, (1977) USGS Prof. Paper,

CENG151 Introduction to Materials Science and Selection

Introduction to Materials Science, Chapter 9, Phase Diagrams University of Virginia, Dept. of Materials Science and Engineering 1 Development of microstructure.

Readings: Winter Chapter 7

EXPERIMENT # 9 Instructor: M.Yaqub

Chapter Outline: Phase Diagrams

Mineral Stability What controls when and where a particular mineral forms? Commonly referred to as “Rock cycle” Rock cycle: Mineralogical changes that.

CENG151 Introduction to Materials Science and Selection

Notation convention Let G' stand for total free energy and in a similar fashion S', V', H', etc. Then we will let = G'/n represent the free energy per.

Element Groups (Families)

How to calculate the total amount of  phase (both eutectic and primary)? Fraction of  phase determined by application of the lever rule across the entire.

Lecture 9 Phase Diagrams 8-1.

Element Groups (Families)

Introduction to Materials Science, Chapter 9, Phase Diagrams University of Virginia, Dept. of Materials Science and Engineering 1 Growth of Solid Equilibrium.

Thermal Equilibrium Diagram

(Earth Science Teachers’ Association)

Microstructure and Phase Transformations in Multicomponent Systems

PHASE DIAGRAMS THEORY AND APPLICATIONS. Some basic concepts u Phase A homogeneous region with distinct structure and physical properties In principle,

Review: Binary Phase Diagrams N0zєXAXBN0zєXAXB є =  AB – ½ (  AA +  BB ) , є > 0   AB is large  avoid A-B bonds  clustering, unmixing, phase separation.

Phase Rule and Phase Equilibria

Phase equilibrium Plan 1.Phase equilibrium. Gibb’s phase rule. 2.Diagram of the state for a one component system 2.Diagram of the state for a one component.

The Phase Rule and its application. Thermodynamics A system: Some portion of the universe that you wish to study The surroundings: The adjacent part of.

Lab 3. Binary Phase Diagrams. Binary Peritectic System Peritectic point - The point on a phase diagram where a reaction takes place between a previously.

CHE 333 Class 3 Phase Diagrams.. Why Phases? Few materials used in pure state – gold, copper, platinum etc for electrical properties or coatings. Most.

Geol 2312 Igneous and Metamorphic Petrology

The Phase Rule and its application

 Thermodynamics?  Therma (heat) + Dynamics (study of the causes of motion and changes in motion)  Heat = energy (1 st law?)  Wiki: the branch of physical.

Fo Liquid EnSiO 2 X Forsterite + Enstatite Enstatite + Silica Enstatite + Liquid Forsterite + Liquid Temperature P = 1 atm 1. Cool liquid X to liquidus;

10.5 Liquid and Solid Standard States

Affect of Variables on Recrystallization

Chapter 17 Stability of minerals. Introduction Kinetics (the rate of reactions): Kinetics (the rate of reactions): –Reaction rates slow down on cooling.

Exsolution and Phase Diagrams Lecture 11. Alkali Feldspar Exsolution ‘Microcline’ - an alkali feldspar in which Na- and K-rich bands have formed perpendicular.

Lecture 4 Phase Diagram.

Chemical compositions of equilibrated phases One phase areas: the determination of the chemical composition of a single phase is automatic: it has the.

Phase diagrams of unary and binary systems

Phase Diagrams Continued

Geol 2312 Igneous and Metamorphic Petrology

Phase Diagrams 8-1.

Class 8. Mantle Melting and Phase Diagrams William Wilcock

Phase Diagrams Liquid a b Anorthite + Liquid T C Diopside + Anorthite

CHAPTER 8 Phase Diagrams 1.

CHAPTER 8 Phase Diagrams 1.

CHAPTER 8 Phase Diagrams 1.

Eutectic and Peritectic Systems

Phase diagrams of pure substances

Temperature 1. Cool liquid X to liquidus; En begins to crystallize

The Phase Rule.

T l s Full solubility liquid Phase diagram solid g(n) Gibbs Energy

Mechanical Properties of Isomorphous Alloys

Presentation transcript:

Hot Under the Collar (part III) Phase Diagrams Rocks at last!!!!

Gibbs Phase Rule F = C - P + 2 F = the number of degrees of freedom C = the number of components P = number of phases

Gibbs Phase Rule Divarient Field Point C F = C - P + 2 Only one phase Only one component (e.g. H2O exists as ice, water and steam but is always present as H2O) Therefore two degrees of freedom Divarient Field

Gibbs Phase Rule Univarient Line Point B F = C - P + 2 Two phases Only one component (e.g. H2O exists as ice, water and steam but is always present as H2O) Therefore one degree of freedom Univarient Line

Gibbs Phase Rule Invarient Point Point A F = C - P + 2 Three phases Only one component (e.g. H2O exists as ice, water and steam but is always present as H2O) Therefore no degrees of freedom Invarient Point

Two component phase diagrams – mixtures between two endmembers Binary Phase Diagrams Two component phase diagrams – mixtures between two endmembers

Binary Phase Diagrams Eutectic Liquidus Solidus

Equilibrium BALANCE MgO + SiO2 MgSiO3 periclase quartz enstatite

Binary Phase Diagrams

Binary Phase Diagrams

Binary Phase Diagrams

Binary Phase Diagrams

Lever Rule F = L2/L1 F is the fraction of melt remaining

Lever Rule F = L3/L1 F is the fraction of crystals of B L3

Lever Rule F = L2/L1 F is the fraction of crystals of B generated at the eutectic

Lever Rule F = L2/L1 F is the fraction total fraction of B in the whole rock

Disequilibrium Reactions are not balanced Rapid cooling Separation of crystals by sinking or flotation (crystal differentiation) “Protection” of crystals by the formation of rims or zoning.

At Disequilibrium

At Disequilibrium

At Disequilibrium

At Disequilibrium

Solid Solutions

Solid Solutions

Solid Solutions

Lever Rule F = L2/L1 F is the fraction of liquid left.

Under Disequilibrium

Under Disequilibrium

Under Disequilibrium

Why phase diagrams are the way they are!!!! Next Time Why phase diagrams are the way they are!!!!