RT Journal Article
T1 Growth of BaxSr1-xSO4 nano-steps on barite (001) face
A1 YuHang, Chen
A1 Asenjo Barahona, Agustina
A1 Sánchez Pastor, Nuria
A1 Fernández Díaz, María Lourdes
A1 Gómez Herrero, Julio
A1 Pina Martínez, Carlos Manuel
AB Crystal growth has been promoted in the fluid cell of an Atomic Force Microscope (AFM) by passing Ba–Sr–SO4 aqueous solutions over barite (001) cleavage surfaces. Steps advance in structural continuity with the original barite (001) surfaces and two-dimensional nucleation occurs preferentially on the newly-formed terraces. The terraces are, on average, 7.5% lower than pure barite terraces. Since the ionic radius of Sr2+ is smaller that the ionic radius of Ba2+, the reduction of terrace height is consistent with an extensive incorporation of Sr2+ into the barite structure. Therefore, it can be considered that the newly-formed terraces have compositions corresponding to terms of the BaxSr1xSO4 solid solution. A non-linear dependence of step rate on [SrSO4] concentration in the solution (and therefore on supersaturation) has been found. The growth behaviour has been discussed by considering both the physicochemical properties of the BaxSr1xSO4 solid solution–aqueous solution (SS–AS) system and a kinetic-based step growth model.
PB Elsevier
SN 0039-6028
YR 2007
FD 2007
LK https://hdl.handle.net/20.500.14352/49783
UL https://hdl.handle.net/20.500.14352/49783
LA eng
DS Docta Complutense
RD 2 oct 2024