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Updated: Nov 10, 2025
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
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New Solids in As-O-Mo, As(P)-O-Mo(W) and As(P)-O-Nb(W) Systems That Exhibit Nonlinear Optical Properties
Nikolay Gerasimchuk1, Lauri Kivijarvi1, Bruce Noll2
1Department of Chemistry, Missouri State University, Temple Hall 456, Springfield, MO 65897, USA.
Molecules (Basel, Switzerland)
|April 3, 2021
Summary
New crystalline materials were synthesized from arsenic, phosphorus, molybdenum, tungsten, and niobium oxides. These novel semiconducting solids exhibit a strong second-harmonic-generation effect and unique layered structures.
Area of Science:
- Solid-state chemistry
- Materials science
- Inorganic synthesis
Background:
- Exploration of mixed-valence compounds for novel properties.
- Synthesis of complex oxides involving transition metals.
Purpose of the Study:
- To synthesize and characterize new crystalline materials from As2O3, P2O5, MoO3, WO3, and Nb2O5.
- To investigate the structural, optical, and electrical properties of the synthesized compounds.
- To explore the potential applications of these new materials.
Main Methods:
- High-temperature solid-state reaction under vacuum.
- X-ray diffraction for structural analysis.
- Spectroscopic techniques (diffusion reflectance, IR, Raman, EPR).
- Second harmonic generation (SHG) measurements.
- Thermal analysis (TGA/DSC).
- Single crystal electrical conductivity studies.
Main Results:
- Formation of four new complex crystalline solids with previously unknown compositions and structures.
- Three compounds crystallized in non-centrosymmetric space groups, forming layered 2D polymeric puckered structures.
- All synthesized solids exhibited a strong second-harmonic-generation (SHG) effect.
- The new compounds demonstrated semiconductor behavior with determined band gaps.
- A rare phenomenon was observed during SHG testing when crystals moved in the laser beam.
Conclusions:
- Successful synthesis of novel complex oxide materials.
- Demonstration of significant nonlinear optical properties (SHG effect).
- Confirmation of semiconducting behavior and characterization of band gaps.
- Potential for practical applications in optics and electronics due to their unique properties.
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