title: Formation of structured nanophases in halide crystals.
abstract: When halide crystals KCl and NaCl are slightly doped by PbCl(2), (in orders of 10(-4) mol/mol) the structurally stable nanophases ("quantum dots") are formed via nucleation within the bulks of their matrices. Using lattice modeling we have found in KCl-Pb system natural nucleation pathway from single impurity-vacancy complex to Suzuki phase, not demonstrated in previous analyses; further transition to PbCl(2) is difficult due to high stability of this phase. In the case of NaCl-Pb, no stable "end point" of aggregation was observed and our calculations suggest nucleation may readily proceed to large PbCl(2) clusters when initially formed platelike cluster reaches a certain critical thickness. These results coincide with our experimental data.
authors.affiliation: Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 162 00 Praha 6, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Kulveit
authors.forename: P
authors.initials: P
authors.lastname: Demo
authors.forename: K
authors.initials: K
authors.lastname: Polák
authors.forename: A M
authors.initials: AM
authors.lastname: Sveshnikov
authors.forename: Z
authors.initials: Z
authors.lastname: Kožíšek