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

- Chemistry -
**guest**, Thursday, July 31, 2014 at 2:18pm
thank you bery much

- Chemistry -
**an**, Monday, August 4, 2014 at 7:26am
how you clacula the number c?

- Chemistry -
**L.Festinger**, Friday, August 8, 2014 at 11:05am
@an apply the lever rule.

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