The crystal structure of the isomorphical rare earth borophosphate compounds, Ln(7)O(6)(BO3)(PO4)(2) (Ln=La, Nd, Gd and Dy), has been studied by a combination of X-ray powder diffraction (XRD) and vibration spectroscopic techniques. The Raman and infrared specra of these compounds have been investigated, and their interpretation is discussed on both theoretical and experimental bases. Assignments have been deduced from the systematic investigation of pure compounds and isotopic species. A comparison of vibrational frequencies in La, Na, Gd, and Dy borophosphates reveals that the internal vibrations of the BO2 and PO4 ions shift to higher frequency with the decrement of lattice parameters from La to Dy, indicating a strengthening of the phosporus-oxygen and boron-oxygen bonding. (C) 1997 Academic Press.
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