How to Look for Compounds: Predictive Screening and in situ Studies in Na-Zn-Bi System

Area of Science:

• Materials Science
• Solid State Chemistry
• Computational Materials Science

Background:

• The discovery of novel compounds is crucial for advancing materials science.
• Exploring complex multinary systems like Na-Zn-Bi presents significant challenges.
• Predictive methods can accelerate the discovery process.

Purpose of the Study:

• To demonstrate a combined theoretical and experimental approach for discovering novel compounds.
• To explore the previously uncharacterized Na-Zn-Bi system.
• To understand the phase equilibria and structural properties within this system.

Main Methods:

• Theoretical computations (electronic structure calculations).
• Rapid experimental screening using the hydride route method.
• In situ synchrotron powder X-ray diffraction (XRD).
• Single crystal X-ray diffraction.

Main Results:

• Discovery of four novel phases in the Na-Zn-Bi system.
• Successful synthesis of predicted NaZnBi and Na11Zn2Bi5 phases.
• Identification of two new Zn-deficient, isostructural phases derived from NaZnBi.
• Observation of a high-temperature polymorph of Na3Bi (HT-Na3Bi) from Na11Zn2Bi5 decomposition.

Conclusions:

• The combined computational and experimental strategy is highly effective for novel compound discovery.
• The Na-Zn-Bi system exhibits complex phase behavior, including Zn vacancies and high-temperature polymorphs.
• This predictive synthesis approach is applicable to other multinary systems.