Re: <none>

Matteo Leoni ( leonim@ing.unitn.it )
Fri, 5 Jun 1998 16:31:06 +0200 (MET DST)

> Searching in the literature about nickel hydroxide, it is mentioned that
> two Ni(OH)2 phases exist (alpha and beta). Does anybody have information
> about the crystallography of these two phases?

Just had a quick look at the CSD... maybe you've already found them...
in any case there are just two references there on Ni hydroxide:

Nickel hydroxide
Ni (O H)2
55 527 1933 JACSA(678)
Journal of the American Chemical Society
Cairns R W, Ott E
Space Group : P3-m1 (or P-3m1) (164)

Dimensions 3.1140(-) 3.1140(-) 4.6170(-)
Angles 90.000(-) 90.000(-) 120.000(-)
Measured Density 3.560(-)
Volume 38.773
Z-Value 1
Space Group Code P3-M1
Space Group No. 164

Atom Oxid. Wyck. Occup. x y z

Ni1 2.0 1A - .0000(-) .0000(-) .0000(-)
O1 1H -2.0 2D 1.00(0) .3333(-) .6667(-) .2500(-)
H1 1.0 2.00 Atoms not located in Unit Cell

Nickel hydroxide
Ni (O H)2
43 125 1971 PSSBB(1124)
Physica Status Solidi, Sectio B: Basic Research
Szytula A, Murasik A, Balanda M
Space Group : P3-m1 (or P-3m1) (164)

Dimensions 3.1300(-) 3.1300(-) 4.6300(-)
Angles 90.000(-) 90.000(-) 120.000(-)
Measured Density -
Volume 39.283
Z-Value 1
Space Group Code P3-M1
Space Group No. 164
Number of Atoms 3

Atom Oxid. Wyck. Occup. x y z

Ni1 2.0 1A - .0000(-) .0000(-) .0000(-)
O1 -2.0 2D - .3333(-) .6667(-) .2400(-)
H1 1.0 2D - .3333(-) .6667(-) .4700(-)

they seems quite old, and so probably Alan Hewat's reference is better...
cheers
Matteo

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