Homework Help: Chemistry

Posted by Odesa on Tuesday, December 11, 2012 at 3:35am.

(a) The phase diagram of the binary system, neodymium-scandium ( Nd-Sc ) is given below. There are two polymorphs in the solid state: alpha which is hexagonal close packed (HCP) and beta which is body-centered cubic (BCC).

Identify all phases present at points 1, 2, and 3.

Point 1:
Liquid
Vapor
beta-phase
Sc-rich beta -phase
Nd-rich beta-phase
alpha-phase
Sc-rich alpha-phase
Nd-rich alpha-phase

Point 2:
Liquid
Vapor
beta-phase
alpha-phase

Point 3:
Liquid
Vapor
beta-phase
Sc-rich beta -phase
Nd-rich beta-phase
alpha-phase
Sc-rich alpha-phase
Nd-rich alpha-phase

(b) Are there any examples of a three-phase equilibrium in this phase diagram?
i)Yes, there is a eutectic at 700 degrees C and 60 at. % Sc.
ii)Yes, there is a eutectoid at 800 degrees C and 22 at. % Sc.
iii)Yes, there is a peritectic at 800 degrees C and 22 at. % Sc.
iv)No, there are no three-phase equilibrium points in this diagram.

(c) At point 3, calculate the phase fraction of the phase richest in Nd

Chemistry - qwerty, Tuesday, December 11, 2012 at 7:32pm
(a)
Point 1: Liquid, beta-phase
Point 2: alpha-phase
Point 3: Sc-rich alpha-phase, Nd-rich alpha-phase

(b)
iv)No, there are no three-phase equilibrium points in this diagram.

(c)
0.2631
Chemistry - Odesa, Tuesday, December 11, 2012 at 10:14pm
Thank you

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