Wynette Redington

Research Field

Rapid cooling rates and quenching have traditionally been associated with glass formation. Hampshire et al. [1] investigated oxynitride glasses cooled in a tungsten resistance furnace at approximately 200oC/min and found that fast cooling rates were only important near the limits of the glass-forming region. In the current work on various M-Si-Al-O-N (M=Y, La, Yb, Nd) systems, it was found that even at a relatively slow cooling rate glass formation was still possible for a wide range of compositions. Different cooling rates were investigated to determine the minimum cooling rate at which a glass will form. Quantitative X-ray analysis of melted compositions indicated the relative amounts of amorphous phase and crystalline phase.

Slow cooling

10.4028/www.scientific.net/msf.554.25

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Citations (2)

Liquid/glass immiscibility in yttria doped mullite ceramics

Journal of the European Ceramic Society (2016)

José Rocha-Jiménez Yina Guo J. Merced Martínez-Rosales Satoshi Sugita Wynette Redington

Mullite

10.1016/j.jeurceramsoc.2016.05.032

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Citations (6)

Selective Phase Transformation of Wurtzite Cu₂ZnSn(SSe)₄ (CZTSSe) Nanocrystals into Zinc-Blende and Kesterite Phases by Solution and Solid State Transformations

Chemistry of Materials (2016)

Shalini Singh Michael P. Brandon Pai Liu Fathima Laffir Wynette Redington

A wide range of physical properties from optoelectronic (e.g., band gap) to structural (e.g., hardness) can be affected without changing the composition of a solid but just by altering the crystal phase. Here, we report a selective structural phase transition of metastable wurtzite CZTSSe nanocrystals into more stable phases such as zinc blende and kesterite using solution and solid state transformations, respectively. The phase transformation pathways are selective, with the wurtzite to zinc-blende transition not occurring because of thermal annealing or the wurtzite to kesterite transition because of solution transformation. We show the importance of both ligand chemistry and temperature to lowering the barrier for rapid conversion from one phase to another in this system. The phase transitions are accompanied by changes in the band gap with values for each calculated by cyclic voltammetry.

Wurtzite crystal structure

Kesterite

Metastability

10.1021/acs.chemmater.6b01845

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Citations (25)

X-ray analyses of thermally grown and reactively sputtered tantalum oxide films on NiTi alloy

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2011)

Karrina McNamara Syed A. M. Tofail Derek Conroy James D. Butler Abbasi A. Gandhi

Nickel titanium

10.1016/j.nimb.2011.07.106

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Citations (7)

Effect of Porosity on Properties Si<sub>3</sub>N<sub>4</sub>

Key engineering materials (2001)

Aránzazu Díaz‐Cuenca Wynette Redington Stuart Hampshire

10.4028/www.scientific.net/kem.206-213.1033

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Citations (0)

Properties of some high Al content glasses in various lanthanide–Si–Al–O–N systems

Journal of Non-Crystalline Solids (2003)

Wynette Redington Murt Redington Stuart Hampshire Marina Serantoni

Sialon

Liquid phase

10.1016/s0022-3093(02)01939-7

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Citations (18)

An Extension of the Liquid-Forming Region in the M-Si-Al-O-N System

Key engineering materials (2001)

Wynette Redington Murt Redington Stuart Hampshire

10.4028/www.scientific.net/kem.206-213.2125

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Citations (1)

Pt Nanoparticle Decoration of Carbon Materials with Applications in Glucose Sensing and Fuel Cell Technology

Meeting abstracts/Meeting abstracts (Electrochemical Society. CD-ROM) (2009)

Dhanraj Rathod Calum Dickinson Wynette Redington David A. Tanner Denise A. Egan

Abstract not Available.

Carbon fibers

Carbon Nanoparticles

10.1149/ma2009-02/37/2831

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Extension and Representation of the Glass Forming Region in the Nd-Si-Al-O-N System

Key engineering materials (2004)

Wynette Redington Murt Redington Stuart Hampshire

Recent work has indicated that the glass-forming region in the Y-Si-Al-O-N system could be more extensive than originally reported, particularly in the Al-rich part of the system. With knowledge gained from the Y-Si-Al-O-N system and bringing together published behaviour diagrams for the Nd-Si-Al-O-N system, a further study of the latter system was undertaken. The present work outlines the extension of the glass-forming region to Al-rich glasses compositions in the Nd-Si-Al-O-N system.

Representation

10.4028/www.scientific.net/kem.264-268.1911

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Citations (0)

Effects of nitrogen and fluorine on crystallisation of Ca–Si–Al–O–N–F glasses

Journal of the European Ceramic Society (2011)

Amir Reza Hanifi Annaïk Genson Wynette Redington Michael J. Pomeroy Stuart Hampshire

Gehlenite

Anorthite

Wollastonite

Differential thermal analysis

10.1016/j.jeurceramsoc.2011.10.026