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Unterphosphorige Säure reagiert mit den Acetylenen (Ia)‐(Ic) oder (Ie) zu den Alkenphosphinsäuren (II).

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Lead Germanate thin films have been successfully deposited on different electrodes by a metalorganic chemical vapor deposition (MOCVD) system for the first time. Three different phases have been characterized. The single c-axis oriented Pb 5 Ge 3 O 11 phase has been deposited on Ir, Ir/Pt (Pt on top) and Pt electrodes respectively and shows a very uniform surface. A lead rich phase, Pb 3 GeO 5 , also was formed with a polycrystalline structure and large grain size exhibiting a very rough surface. Finally an unknown oxygen and/or lead deficient phase, which is considered here a non-stoichiometric phase of Pb 5 Ge 3 O 11 , appeared with a smaller interplanar spacing of about 9.4 Å compared with 10.68 Å for the Pb 5 Ge 3 O 11 phase. This unknown phase can co-exist with the c-axis oriented Pb 5 Ge 3 O 11 phase and deteriorates its ferroelectric properties. Post deposition annealing in an oxygen or oxygen plus lead ambient can recover the ferroelectric properties of this film.

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