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Title of Journal: Bull Mater Sci

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Abbravation: Bulletin of Materials Science

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Springer-Verlag

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DOI

10.1007/s11767-004-0015-4

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0973-7669

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Temperatureinduced control over phase selection a

Authors: T N Ramesh P Vishnu Kamath
Publish Date: 2008/08/27
Volume: 31, Issue: 2, Pages: 169-172
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Abstract

While at low 4°C temperatures addition of ammonia to aqueous metal nitrate solutions induces the precipitation of αnickel hydroxide and at high 25–65°C temperatures βNiOH2 is formed The crystallinity of the product improves at higher temperatures of precipitation and the product obtained at 65°C is devoid of various disorders such as stacking faults turbostraticity and interstratification This provides a simple and efficient alternative to the hydrothermal synthesis of crystalline βNiOH2 The temperature induced control over phase selection provides direct experimental evidence for the metastability of αnickel hydroxide Crystalline βNiOH2 is however a poor electrode material for alkaline secondary cells and exhibits a capacity of only 75 ± 10 mAh/g against the theoretically expected 289 mAh/g

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