The Non-Centrosymmetric Borate Hydride Sr₄Ba₃(BO₃)_3.83H_2.5

Area of Science:

• Solid-state chemistry
• Materials science
• Inorganic chemistry

Background:

• Borate and hydride ions are key components in advanced materials.
• Synthesizing compounds with both borate and hydride ions is challenging.
• Understanding the structural and electronic properties of such materials is crucial.

Purpose of the Study:

• To synthesize and characterize a novel strontium barium borate hydride compound.
• To elucidate the crystal structure and confirm the presence of borate and hydride ions.
• To investigate the electronic properties and band gap of the synthesized material.

Main Methods:

• Mechanochemical synthesis route for material preparation.
• Synchrotron X-ray and neutron diffraction for crystal structure determination.
• Vibrational spectroscopy and Density Functional Theory (DFT) calculations for structural and electronic analysis.

Main Results:

• Successful synthesis of Sr 4 Ba 3 (BO 3 ) 3.83 H 2.5 .
• Crystal structure determined in the non-centrosymmetric space group P6 3 mc.
• Vibrational spectroscopy and DFT calculations confirmed the disordered nature and presence of borate and hydride ions.
• Electronic band structure calculations predicted a large band gap of 7.1 eV.

Conclusions:

• Sr 4 Ba 3 (BO 3 ) 3.83 H 2.5 is a new material combining borate and hydride ions.
• The compound exhibits a disordered structure with potential applications in electronic materials.
• This work expands the family of rare compounds containing complex oxoanions and hydride ions.