New Hilgardite-Group Polyborate Pb2[B5O9]Br
with High Optical Nonlinearity
E. L. Belokoneva*, Yu. K. Kabalov*, O. V. Dimitrova*, and S. Yu. Stefanovich**
* Faculty of Geology, Moscow State University, Leninskie gory, Moscow, 119992 Russia
e-mail: elbel@geol.msu.ru
** Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 103064 Russia
Received March 22, 2002
Abstract—New anhydrous lead borate Pb2[B5O9]Br (sp. gr. Pnn2) was synthesized by the hydrothermal
method. The second harmonic generation from polycrystalline samples of Pb2[B5O9]Br is characterized by a
higher signal than that observed in powdered LiB3O5 . The crystal structure of the new hilgardite-group com-
pound was refined by the Rietveld method. Analysis of the known orthorhombic polar varieties of hilgardites,
including the new compound, showed that their boron–oxygen frameworks are occupied by the Pb2+, Ca2+,
Eu2+, and Ba2+ cations; the Cl
, Br
, and OH
anions; and water molecules in combinations determined by their
sizes. © 2003 MAIK “Nauka/Interperiodica”.
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