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Updated: Jan 2, 2026
08:13
Chemical Precipitation Method for the Synthesis of Nb2O5 Modified Bulk Nickel Catalysts with High Specific Surface Area
Published on: February 19, 2018
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Phase Equilibria in the System Niobium Pentoxide- Boric Acid
Summary
This study maps the niobium pentoxide-boron trioxide (Nb2O5-B2O3) phase diagram. Researchers identified a binary compound and a wide liquid immiscibility region, confirming theoretical predictions.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Phase Equilibria
Background:
- Understanding phase diagrams is crucial for developing new materials.
- The Nb2O5-B2O3 system is of interest for its potential applications.
Purpose of the Study:
- To experimentally determine the phase-equilibrium diagram of the Nb2O5-B2O3 system.
- To identify binary compounds and phase boundaries within this system.
Main Methods:
- Quenching technique for sample preparation.
- Optical microscopy for microstructural analysis.
- X-ray powder diffractometry for phase identification.
Main Results:
- A binary compound with approximate composition 3Nb2O5 · B2O3 was identified.
- This compound melts incongruently at approximately 1150 °C.
- A significant liquid immiscibility region was observed between 10 and 65.7 mole percent Nb2O5 at 1352 °C.
Conclusions:
- The experimental phase diagram provides valuable data for the Nb2O5-B2O3 system.
- The observed liquid immiscibility region aligns with theoretical calculations.
- This research contributes to the understanding of oxide-based material systems.
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