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  4. Syntheses, structures and characterizations of novel arsenotungstates : NLO, conductivity, band-gap and thermal expansion properties
 
Zitierlink URN
https://nbn-resolving.de/urn:nbn:de:gbv:46-00104700-18

Syntheses, structures and characterizations of novel arsenotungstates : NLO, conductivity, band-gap and thermal expansion properties

Veröffentlichungsdatum
2015-09-04
Autoren
Zhao, Pei  
Betreuer
Gesing, Thorsten M.  
Gutachter
Alekseev, Evgeny  
Zusammenfassung
Three groups of tungsten compounds: tungsten oxides, tungsten bronzes and tungstates (VI) are reviewed. Based on the first alkali metal arsenotungstate, we synthesized two novel compounds by replacing alkali metals. Of them, the sodium arsenotungstate is isotypic to the potassium compound, but the lithium compound has a completely new framework. The structures were discussed in detail along with diffraction, Raman and infrared spectra, thermal analysis and properties like nonlinear optical. We discussed the temperature-dependent properties of these three products, especially thermal expansion behavior. From the diffraction data, the metric parameters can be extracted and modeled using Grüneisen first-order approximation for the zero-pressure equation of state. Using Raman spectra data and the autocorrelation method, we can get consistent results. We also measured electrochemical impedance spectroscopy to know conductivity properties. The phase diagram of the system K2O-As2O5-WO3 was intensively studied by selecting the special points with different molar ratios of raw materials and analyzing products via powder X-ray diffraction patterns.
Schlagwörter
alkali metal arsenotungstate

; 

temperature-dependent

; 

nonlinear optical

; 

thermal expansion

; 

Debye-Einstein-Anharmonicity model

; 

autocorrelation

; 

density function theory

; 

phase diagram
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Dissertation
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
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Vorschaubild
Name

00104700-1.pdf

Size

16.57 MB

Format

Adobe PDF

Checksum

(MD5):b242d02b4f6790e3dcb72002c4dbffd8

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