Formation of α,β-Type Hydroxides and Second-Stage Intermediate in Hydrothermal Decomposition of Nickel Acetate
✍ Scribed by H. Nishizawa; T. Kishikawa; H. Minami
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 944 KB
- Volume
- 146
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
During heating of nickel acetate solution at a constant rate of 43C/min up to 3503C, -type anion-exchangeable layered hydroxide Ni 2 (OH) 3 (OCOCH 3 )1.4H 2 O, containing the acetate anions in the interlayer spaces, 5rst crystallized at 1603C. A second-stage intermediate phase losing the acetate guest in every second layer appeared at 1803C and subsequently transformed at 2103C to slightly disordered -Ni(OH) 2 phase with a small amount of acetate anions. -Ni(OH) 2 phases were gradually losing the acetate guest with increasing temperature, and perfectly ordered hexagonal-shaped -Ni(OH) 2 crystals with a mean diameter of 10 m were obtained at 3203C. Above 3403C, dehydration of -Ni(OH) 2 to NiO occurred.