Temperature dependent investigations on PbMBO4 (M = Al, Mn)
Metal borates with 6s2 lone electron pair (LEP) elements are tunable for non-centrosymmetric phases, which is a pre-requisite for a variety of technologically important properties. A series of PbAl1-xMnxBO4 (x = 0.0 – 1.0) compounds have been synthesized and investigated by in-house x-ray diffraction, IR and Raman spectroscopes and powder neutron diffraction on D2B for x = 0.5. Whereas the in-house x-ray high absorption due to Pb and the presence of light atoms for x-ray (namely boron) hardly allow the determination of an accurate crystal structure, neutron data have shown to be very successful. Here we ask for beamtime on D2B which would help to a) accurately determine the crystal structure, b) corroborate the spectroscopic evidence of BO3 geometry with the crystal data, c) investigate possible phase transition at high temperatures, d) explore how these compounds with high global instability index (GII > 0.2 v.u.) adopt /change lattice-induced strain from RT to elevated temperatures, and e) check how far the LEP of Pb2+ influences the stereochemistry of the compoundswith respect to the eccentricity parameter. In order to avoid neutron absorption 11B was used for al samples.
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Thorsten M. Gesing; M. Mangir Murshed and NENERT Gwilherm. (2012). Temperature dependent investigations on PbMBO4 (M = Al, Mn). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-505
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