Question

T(K) 2500 2400 3) Using the phase diagram below for the system MgO-SiO2 and given the TMelt for MgO is 2,852°C: a) Compile a list of all the melting points of the compounds (including the end members). b) Compare the melting point of the two end members, MgO and SiO? to the eutectic temperature. c) Determine the chemical composition of tridymite (trid) and of cristobalite (crist). 2300 MgO + Slag-liq 2200 2100 2000 MgO +Mg2SiO4 1900 1800 1700 MgO Mg2SiO4 Slag-liq Mg2SiO? + Slag-liq Slag-liq + Slag-liq#2 (miscibility gap) MgSiO3 SiO?(crist) + Slag-liq MgSiO3 + SiO?(crist) MgSiO3 + SiO?(trid) 1600 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 XSiO?

          T(K)
2500
2400
3) Using the phase diagram below for the system MgO-SiO2 and given the TMelt for MgO is 2,852°C:
a) Compile a list of all the melting points of the compounds (including the end members).
b) Compare the melting point of the two end members, MgO and SiO? to the eutectic temperature.
c) Determine the chemical composition of tridymite (trid) and of cristobalite (crist).
2300
MgO + Slag-liq
2200
2100
2000
MgO +Mg2SiO4
1900
1800
1700
MgO
Mg2SiO4
Slag-liq
Mg2SiO? + Slag-liq
Slag-liq + Slag-liq#2
(miscibility gap)
MgSiO3
SiO?(crist) + Slag-liq
MgSiO3 + SiO?(crist)
MgSiO3 + SiO?(trid)
1600
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
XSiO?

T(K)
2500
2400
3) Using the phase diagram below for the system MgO-SiO2 and given the TMelt for MgO is 2,852°C:
a) Compile a list of all the melting points of the compounds (including the end members).
b) Compare the melting point of the two end members, MgO and SiO? to the eutectic temperature.
c) Determine the chemical composition of tridymite (trid) and of cristobalite (crist).
2300
MgO + Slag-liq
2200
2100
2000
MgO +Mg2SiO4
1900
1800
1700
MgO
Mg2SiO4
Slag-liq
Mg2SiO? + Slag-liq
Slag-liq + Slag-liq#2
(miscibility gap)
MgSiO3
SiO?(crist) + Slag-liq
MgSiO3 + SiO?(crist)
MgSiO3 + SiO?(trid)
1600
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
XSiO?

Added by Margaret M.

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