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oai:docta.ucm.es:20.500.14352/436412023-08-26T11:51:03Zcom_20.500.14352_14col_20.500.14352_15

Nanoscale anglesite growth on the celestite (001) face. Pina Martínez, Carlos Manuel Rico García, Aida In situ atomic force microscopy (AFM) was used to study the growth behaviour of anglesite (PbSO4) monolayers on the celestite (001) face. Growth was promoted by exposing the celestite cleavage surfaces to aqueous solutions that were supersaturated with respect to anglesite. The solution supersaturation, βang, was varied from 1.05 to 3.09 (where βang = a(Pb2+)•a(SO42-)/Ksp,ang). In this range of supersaturation, two single anglesite monolayers (~3.5 Å in height each) from pre-existent celestite steps were grown. However, for solution supersaturation of the values of βang < 1.89 +- 0.06, subsequent multilayer growth is strongly inhibited. AFM observations indicate that the inhibition of a continuous layer-by-layer growth of anglesite on the celestite (001) face is due to the in-plane strain generated by the slight difference between the anglesite and celestite lattice parameters (i.e. the linear misfits are lower than 1.1%). The minimum supersaturation required to overcome the energy barrier for multilayer growth gave an estimate of the in-plane strain energy: 11.4 +/- 0.6 mJ/m2. Once this energy barrier is overcome, a multilayer Frank–van der Merwe epitaxial growth was observed. 2023-06-20T01:28:48Z 2023-06-20T01:28:48Z 2009-09-01 journal article 0039-6028 10.1016/j.susc.2009.07.007 https://hdl.handle.net/20.500.14352/43641 http://www.elsevier.com/wps/find/journaldescription.cws_home/505676/description#description http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235546%232009%23993969982%231448051%23FLA%23&_cdi=5546&_pubType=J&_auth=y&_acct=C000012038&_version=1&_urlVersion=0&_userid=144492&md5=fea0477e827859be4fef0a1485fb7189 eng Project No.CCG08-UCM/AMB-3795 Grant No. 910148-Superficies Minerales open access Elsevier