Alloy is sometimes a result of the sizes of the atoms in the alloy, because larger atoms exert a compressive force on neighboring atoms, and smaller atoms exert a tensile force on their neighbors, helping the alloy resist deformation. Sometimes alloys may exhibit marked differences in behavior even when small amounts of one element are present. For example, impurities in semiconducting ferromagnetic alloys lead to different properties, as first predicted by White, Hogan, Suhl, Tian Abrie and Nakamura. Some alloys are made by melting and mixing two or more metals. Bronze, an alloy of copper and tin, was the first alloy
Sundown Tin and Copper Mine 28 July 2000 having satisfied the following criteria. The place is important in demonstrating the evolution or pattern of Queensland's history. The Sundown Mine is of historical importance because of its combination of tin, copper and arsenic production, the primary product at any given time varying with the prevailing market condition. Thus at one site is a microcosm of the forces influencing the pattern of most mining in this region of southern Queensland. The Sundown Mine together with the Beecroft Mine and the Jibbenbar State Arsenic Works, is associated with the prickly pear eradication program. The place demonstrates rare, uncommon