Thursday
April 24, 2014

Homework Help: chemistry

Posted by anita on Monday, December 17, 2012 at 6:02am.

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

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


Point 1:



Liquid

Vapor

β-phase

Sc-rich β-phase

Nd-rich β-phase

α-phase

Sc-rich α-phase

Nd-rich α-phase
Point 2:



Liquid

Vapor

β-phase

α-phase
Point 3:



Liquid

Vapor

β-phase

Sc-rich β-phase

Nd-rich β-phase

α-phase

Sc-rich α-phase

Nd-rich α-phase
You have used 3 of 3 submissions
(b) Are there any examples of a three-phase equilibrium in this phase diagram?



Yes, there is a eutectic at 700 degrees C and 60 at. % Sc.

Yes, there is a eutectoid at 800 degrees C and 22 at. % Sc.

Yes, there is a peritectic at 800 degrees C and 22 at. % Sc.

No, there are no three-phase equilibrium points in this diagram.
You have used 1 of 2 submissions
(c) At point 3, calculate the phase fraction of the phase richest in Nd.

unanswered

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - (a) The phase diagram of the binary system, neodymium-scandium ( Nd-...
Chemistry - A typical phase change diagram is shown below. What are the correct...
chemistry - I have 3 questions that I am uncertain about. 1) what determines the...
math - the binary system is used for computer programming. a binary number ...
binary system - how does the binary system work?
Chemistry - What is true for water? A) In a phase diagram the solid-liquid ...
chemistry - Shown below is a schematic representation of the water-ethanol phase...
science - Shown below is a rough sketch of the unary phase diagram (pressure vs...
Chemistry - Is there a correlation between temperature change with the changes ...
chemistry - what does it mean by in phase and out of phase for orbitals. Is in ...

Search
Members