Abstractα,α‐Dichlordimethylether (II) reagiert mit Dialkylphosphiten (I) zu den Methoxymethan‐diphosphonsäureestern (III).

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621.762 Oxide composite Al 2 O 3 -ZrO 2 (Y 2 O 3 ) powders containing 50 and 70 vol.% Al 2 O 3 , are deposited from salt solutions. The surface area of the deposited powders exceeds 75 m 2 /g. It is established that the α-Al 2 O 3 and t-ZrO 2 (Y 2 O 3 ) matrix has an effect on stepwise crystallization of α-Al 2 O 3 and the powder production history on the sinterability of oxide composites. Ceramics based on Al 2 O 3 -ZrO 2 (Y 2 O 3 ) composite powder containing 20 vol.% titanium carbonitride are hot pressed to be used as a cutting tool. The microstructure and mechanical properties of the ceramics are analyzed. The best mechanical properties are shown by ceramic samples sintered at 1550°C at 35 MPa: bending strength 950 MPa, fracture toughness 10.1 MPa ⋅ m 1/2 , and hardness 18.0 GPa. The performance and lifetime of cutting tools based on these ceramics are tested according to GOST 26613-85.

A spectroscopic investigation of the electron energy distributions and spectral photosensitivities of the photoemission from field-assisted caesiated metal-semiconductor structures has been performed. Strong field heating of the electron distribution in the semiconductor crystal due to the applied electric field was directly observed and a n increase in the photoemission sensitivity by a factor

243ChemInform Abstract The complex (I), formed from benzene, phosphorus trichloride, and aluminum trichloride, is chloromethylated with paraformaldehyde (II) in the presence of phosphoryl chloride to give the phosphine oxide (III). The phosphine oxide (V) is obtained from (I) and dichloromethyl methyl ether (IV). Reaction of dioctylphosphine oxide (VI) with (II) and subsequent chlorination yield the phosphine oxide (VIII). (1H-NMR-data).