✍ Scribed by D. Pelloquin; M. Louër; D. Louër
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The crystal structure of yttrium oxide nitrate and the microstructure of the oxide obtained from its thermal decomposition have been investigated by modern powder diffraction methods. Sequential high-temperature diffraction studies of the thermal decomposition of two precursors of yttrium oxide nitrate, i.e., neutral yttrium nitrate and yttrium hydroxide nitrate, are reported. The structure of (\mathrm{YONO}{3}) has been determined ab initio from conventional powder diffractometry using monochromatic X-rays. The pattern was indexed by the successive dichotomy method yielding tetragonal unit cell dimensions: (a=3.8590(1) \AA) and (c=9.7161(6) \AA). The space group is (P 4 / n m m) and (Z=2). Most of the atoms were located by direct methods and the remaining ones from a Fourier map. Refinement of the complete diffraction profile parameters converged to final agreement factors (R{\mathrm{p}}=0.12, R_{\mathrm{wp}}=0.16) and (R_{\mathrm{F}}=0.039). The structure is closely related to the matlockite PbFCl-type structure. The microstructure of ex-oxide-nitrate yttrium oxide has been analysed by total pattern fitting techniques, from which strain-free coherently diffracting nanodomains with a rectangular parallelepipedic shape have been obtained. O 1994 Academic Press, Inc.
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