STRUCTURAL CHARACTERIZATION AND CRYSTAL-GROWTH OF THE 2-AMINO-5-NITROPYRIDINIUM DIHYDROGENPHOSPHATE ARSENATE HYBRID SOLID-SOLUTION

The 2-amino-5-nitropyridinium dihydrogenphosphate/arsenate (2B5NPDP((1 -x))As-x) solid solution offers the opportunity to adjust the NLO prop erties of these hybrid organic-inorganic materials. This continuous so lid solution has been structurally characterized by X-ray diffraction. In order to overcome the problem of the preferential deposition of th e phosphate anions compared with the arsenate ones during the growth o f the 2A5NPDP((1-x))As-x crystals, a new solution growth reactor has b een perfected. The vertical temperature gradient method allows a simul taneous growth of several (8-10) large crystals. Their good crystallin e quality has been confirmed by synchrotron X-ray diffraction topograp hy. (C) 1998 Elsevier Science B.V. All rights reserved.