Question

Sketch, using graph paper, the phase diagram for Na2O–Nb2O5 using the following information: There are four binary phases with melting points as follows: Na3NbO4 congruent, 992 °C; NaNbO3 congruent, 1412 °C; Na2Nb8O21 incongruent, 1265 °C (to Na2Nb20O51 + liquid); Na2Nb20O51 incongruent, 1290 °C (to Nb2O5 + liquid); Na2O melts at ~1200 °C; Nb2O5 melts at 1485 °C. Eutectics at: 10% Nb2O5, 830 °C; 31% Nb2O5, 975 °C; 68% Nb2O5, 1220 °C. NaNbO3 undergoes polymorphic transitions at 368 and 640 °C. Label all regions on the diagram.

Name: sketch using graph paper the phase diagram for na2onb2o5 using the following information there are four binary phases with melting points as follows na3nbo4 congruent 992 c nanbo3 congruent 85562
Uploaded: 2023-01-10T16:14:51-08:00
Duration: 5 min 46 s
Channel: Sri K
Description: sketch using graph paper the phase diagram for na2onb2o5 using the following information there are four binary phases with melting points as follows na3nbo4 congruent 992 c nanbo3 congruent 85562

          Sketch, using graph paper, the phase diagram for Na2O–Nb2O5 using the following information: There are four binary phases with melting points as follows: Na3NbO4 congruent, 992 °C; NaNbO3 congruent, 1412 °C; Na2Nb8O21 incongruent, 1265 °C (to Na2Nb20O51 + liquid); Na2Nb20O51 incongruent, 1290 °C (to Nb2O5 + liquid); Na2O melts at ~1200 °C; Nb2O5 melts at 1485 °C. Eutectics at: 10% Nb2O5, 830 °C; 31% Nb2O5, 975 °C; 68% Nb2O5, 1220 °C. NaNbO3 undergoes polymorphic transitions at 368 and 640 °C. Label all regions on the diagram.

Added by Roberto T.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Sri K

01/10/2023

Step 1

Label the horizontal axis as “Composition” (from 0% Nb2O5 at the Na2O end to 100% Nb2O5 at the Nb2O5 end) and the vertical axis as “Temperature (°C)”. Be sure to extend the temperature scale to at least about 1500 °C so that all melting and invariant points are Show more…

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Sketch, using graph paper, the phase diagram for Na2O–Nb2O5 using the following information: There are four binary phases with melting points as follows: Na3NbO4 congruent, 992 °C; NaNbO3 congruent, 1412 °C; Na2Nb8O21 incongruent, 1265 °C (to Na2Nb20O51 + liquid); Na2Nb20O51 incongruent, 1290 °C (to Nb2O5 + liquid); Na2O melts at ~1200 °C; Nb2O5 melts at 1485 °C. Eutectics at: 10% Nb2O5, 830 °C; 31% Nb2O5, 975 °C; 68% Nb2O5, 1220 °C. NaNbO3 undergoes polymorphic transitions at 368 and 640 °C. Label all regions on the diagram.