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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Syntheses of two vanadium oxide-fluoride materials that differ in phase matchability
Martin D Donakowski1, Romain Gautier, Hongcheng Lu
1Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States.
Inorganic Chemistry
|August 20, 2014
Summary
Synthesizing noncentrosymmetric (NCS) vanadium oxide-fluorides from identical precursors yielded two distinct materials. These compounds exhibit different crystal structures and second-harmonic-generation properties, highlighting the impact of synthesis temperature.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Crystallography
Background:
- Noncentrosymmetric (NCS) materials are crucial for nonlinear optical applications.
- Synthesizing chemically similar but structurally distinct NCS materials remains a challenge.
- Vanadium oxide-fluorides are a promising class of materials for such applications.
Purpose of the Study:
- To present the synthesis of two novel NCS vanadium oxide-fluoride compounds.
- To compare the structural and optical properties of these two materials.
- To investigate the influence of synthesis temperature on material formation.
Main Methods:
- Hydrothermal and low-temperature synthesis techniques were employed.
- Reagent concentrations were kept identical for both syntheses.
- X-ray crystallography was used to determine the crystal structures.
Main Results:
- Two distinct NCS vanadium oxide-fluorides, NaVOF(4)(H(2)O) (I) and NaVO(2-x)F(2+x) (II; x = 1/3), were successfully synthesized.
- Compound I crystallized in Pna2(1) and Compound II in P2(1) space groups.
- Both compounds exhibited second-harmonic-generation (SHG) activity, with Compound II being phase-matchable.
Conclusions:
- Synthesis temperature significantly influences the formation of distinct NCS vanadium oxide-fluoride phases from identical precursors.
- The synthesized materials, particularly Compound II, show potential for nonlinear optical applications due to their SHG properties.
- This work demonstrates a pathway to create structurally diverse materials with tunable optical properties.
