Ytterbium was discovered in 1878 by J.C.G. de Marignac in Geneva, Switzerland. Ytterbium is a soft, silvery-white metal of the lanthanide group. It has an abundance of 3.3 ppm in the earth's crust and is always found in combination with other lanthanides. The metal is soft and malleable, oxidises slowly in air and reacts with water. Applications of the metal are limited, research being the principal area of its use.Powder - Small particles with an approximately defined size range. Those materials described as alloy precursors are not true alloys - they are made by sintering a blend of powders of the component metals to achieve alloying by diffusion. The resultant cake is ground and sieved to the required particle size range. Unless otherwise stated, the particle sizes shown are for guidance only. We do not guarantee either any particular size distribution between the quoted minimum and maximum sizes, or a specific particle shape.