Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Hoechst Aktiengesellschaft

Erich Schonherr

Ulrich Von Alpen

Hans-Georg Von Schnering

Albrecht Rabenau

Hans-Gunter Danielmeyer

Gunter Huber

Jean-Pierre Jeser

Thomas Betz

Walter W Kruhler

Gertraude Muller

.beta.-zinc diphosphide monocrystals (.beta.-ZnP.sub.2) (whiskers) having a diameter of at least 7 mm are made. To this end, a quartz ampoule is filled up to 70-90% its volume with polycrystalline .beta.-ZnP.sub.2 ; the ampoule is sealed and drawn in upright position at a velocity of 0.5-2.5 mm/day during a period of 24-120 days through a kiln; the temperature outline from below to above in the kiln is defined by a lower inlet temperature of 580.degree.-780.degree. C., a mean maximum temperature of 800.degree.-950.degree. C. and an upper outlet temperature of 350.degree.-400.degree. C.; the ampoule coming from the furnace is crushed and .beta.-ZnP.sub.2 condensed into a monocrystal via the gas phase by sublimation into the upper ampoule portion is removed.

Process for making beta-zinc diphosphide monocrystals (whiskers)

Crystalline lithium nitride, stable in air, characterized by a sodium content of less than 5.times.10.sup.-2 weight-percent, a potassium content of less than 10.sup.-2 weight-percent, a magnesium content of less than 1.times.10.sup.-2 weight-percent, and a silicon and iron content of 10.sup.-2 to 10.sup.-3 weight-percent each; is obtained by heating lithium having a purity of at least 99.9% in a vessel made of tungsten, niobium, ruthenium or tantalum in a nitrogen atmosphere at a pressure of at least 250 mm Hg in the absence of oxygen and water at a temperature of from 300.degree. C. to the melting point of lithium nitride.

Stable crystalline lithium nitride and process for its preparation

Neodymium ultraphosphates having the formula

Neodymium ultraphosphates and process for their preparation

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Leonberg, Germany

Erich Schonherr