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Magnesium bismuthate

Basic information Safety Supplier Related

Magnesium bismuthate Basic information

Product Name:
Magnesium bismuthate
Synonyms:
  • Magnesium bismuthate
MF:
Bi2MgO6
MW:
538.26216
Mol File:
Mol File
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Magnesium bismuthate Usage And Synthesis

Description

This compound is semiconducting and is employed in small batteries used in portable electronic devices. Magnesium bismuthate is prepared by the reaction of sodium bismuthate with a soluble Mg salt.
MgBi2O6 can be classified as a transparent conducting oxide (TCO) that possess an unusual combination of properties; high transparency across most of the visible spectrum, coupled with high-electrical conductivity. TCO’s have a wide variety of applications, including use in flat panel displays, solar cells, energy-efficient windows, gas sensors, antistatic coatings, and heating elements.

Physical properties

MgBi2O6 reveals temperature- independent conductivity (0.01 S/cm2), a negative Seebeck coefficient (20.025 mV/K), and an optical band gap that falls at the low-energy end of visible region (1.8 eV). This combination of attributes, indicating that this compound is a degenerate n-type semiconductor, a trait that has not previously been reported in a Bi5+ oxide.
It consists of a ring structure of octahedral BiO62- octagonal units with interspersed Mg2+ cations. Characterization of polycrystalline samples of the trirutile oxide Bi5+ revealed temperature-independent conductivity (0.4 and 0.01 S/cm), a negative Seebeck coefficient ( 0.035 and 0.025 mV/K), and an optical band gap that falls at the low-energy end of visible region (1.7 and 1.8 eV). This combination of attributes indicates that this compound is a degenerate n-type semiconductor, a property that has not previously been observed in a Bi5+oxide.

Preparation

The preparation of magnesium bismuthate, MgBi2O6, was accomplished in a sealed PTFE-lined pressure vessel. The pressure vessel and contents were heated to and held at 135°C for 2.5 days. The pressure vessel was cooled to room temperature before opening. After separation of the solid by filtration and drying at 60°C for 24 h, a dark brown powder was obtained.

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