Geoscience Reference
In-Depth Information
Figure 5.53 Characteristic
photograph of calcite single
crystal grown in NH
4
NO
3
solution
[180]
.
(a)
(a)
1cm
0.1 mm
(b)
(b)
1cm
0.04 mm
Figure 5.54 Surface morphology of the calcite crystals using as-cleaved and etched seeds
[180]
.
and etched seeds. Lee and Chung (1998)
[189]
have reattempted the use of the solvent
NH
4
Cl, first reported by Ikornikova
[177]
, to obtain calcite single crystals to suppress
the spontaneous mineralizer. It was observed that the addition of such an organic addi-
tive played an important role in suppressing the formation of spontaneous nuclei; usu-
ally a higher percentage fill (81
83%) was selected in all the experiments and the
pressure
temperature conditions were kept low. Hence, Teflon was used as the liner.
