Phase Equilibria in Ternary System CsBr-AgBr-InBr₃.

Area of Science:

• Materials Science
• Solid-State Chemistry
• Inorganic Chemistry

Background:

• Double perovskite halides (A2B1B3X6) offer less toxic alternatives to lead-based materials.
• These structures can incorporate non-toxic heterovalent cations like silver and indium.
• Cs2AgInBr6 is a potential candidate within this class of materials.

Purpose of the Study:

• To characterize phase equilibria in the CsBr-AgBr-InBr3 ternary system.
• To investigate the thermodynamic feasibility of synthesizing the Cs2AgInBr6 double perovskite.
• To explore alternative materials for optoelectronics.

Main Methods:

• Phase equilibria analysis of the CsBr-AgBr-InBr3 system.
• Thermodynamic assessment of Cs2AgInBr6 formation.
• Solid-state sintering and melt crystallization techniques were considered.

Main Results:

• The Cs2AgInBr6 double perovskite phase was determined to be unfeasible to synthesize.
• The study confirmed the high stability of the constituent binary bromides.
• Phase diagrams indicated potential for other compositions.

Conclusions:

• Direct synthesis of Cs2AgInBr6 is not thermodynamically viable under the studied conditions.
• The stability of binary bromides suggests their potential utility in optoelectronic devices.
• Further research into related bromide systems is warranted for material discovery.