Related Experiment Video
Updated: May 13, 2026
Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
Published on: December 29, 2016
Syntheses, Structures and Optoelectronic Properties of Copper(I) Tungstate/Molybdate Solid Solutions
1Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States.
Synthesizing copper molybdate-tungstate solid solutions via rapid arc-melting yields materials with tunable optoelectronic properties. These semiconductor materials exhibit small bandgaps and high optical absorption, making them promising for advanced applications.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Optoelectronics
Background:
- Solid solutions are effective for tuning semiconductor optoelectronic properties.
- Copper molybdates and tungstates are of interest for their potential applications.
Purpose of the Study:
- To synthesize Cu(I)-containing molybdate and its solid solutions with tungsten.
- To investigate the crystal structure, optoelectronic properties, and electronic band structure of these materials.
- To explore efficient synthesis methods for these compounds.
Main Methods:
- Synthesis via solid-state reactions and rapid arc-melting.
- Characterization using single-crystal X-ray diffraction.
- Electronic structure calculations to determine cation site preference and band edge contributions.
Main Results:
- Successfully synthesized Cu6-xMo5-yWyO18 solid solutions.
- Crystals feature distorted (Mo/W)O6 octahedra forming zigzag chains and layers bridged by Cu(I) cations.
- W(VI) shows site preference for chain coordination over capping positions.
- Black powders exhibit small bandgaps (1.12–1.25 eV) decreasing with increasing tungsten content.
- High optical absorption coefficients (>1 × 105 cm-1) observed at low energies.
- Bandgaps originate from Cu 3d (valence band) and Mo 4d (conduction band) states; W 5d orbitals have minimal impact.
Conclusions:
- Efficient synthesis of Cu(I)-molybdates/tungstates is demonstrated using rapid arc-melting.
- The synthesized solid solutions possess tunable optoelectronic properties.
- These materials show significant potential for optoelectronic applications due to their small bandgaps and high absorption coefficients.
More Related Videos
08:53Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion
Published on: January 30, 2018
04:09Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
Published on: August 30, 2024
Related Concept Videos
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
02:37Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
01:24Solid–Solid Solutions
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...