optical devices with essentially tetragonalen ferroelectric wolframbronzen

摘要

1,228,386. Niobates and tantalates. WESTERN ELECTRIC CO. Inc. 8 July, 1968 [11 July, 1967], No. 32421/68. Heading C1A. [Also in Divisions G2, H3 and H4] An optical device (see Division H4) comprises a ferro-electric single crystal having a composition represented by the formula where MSPI/SP = K, Na, and up to 20 atom per cent total of any one or combination of Li, Rb and Cs; MSPII/SP = Ba, Sr, Ca, Pb, Sn; MSPIII/SP = Y, Sc, and any of the rare earths from Nos. 57 through to 71 on the periodic chart according to Mendelyeev; MSP1IV/SP = Ti, Zr, Sn and up to 10 atom total per cent of any one or combination of Hf, Ge, Si; MSP1V/SP = Nb together with V or Ta together with V, V being limited to a maximum amount of 30 atoms per cent of the total of MSP1V/SP ions; MSP11I/SP = Li together with up to 20 atom per cent Na. ' The Specification describes in detail a plurality of crystals, and the manner in which they are grown, and specifically claims the following crystal compositions: where x equals from 0 to 0.2, and where x equals from 0 to 0.4.