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2015 ; 112
(14
): 4257-62
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Criticality of metals and metalloids
#MMPMID25831527
Graedel TE
; Harper EM
; Nassar NT
; Nuss P
; Reck BK
Proc Natl Acad Sci U S A
2015[Apr]; 112
(14
): 4257-62
PMID25831527
show ga
Imbalances between metal supply and demand, real or anticipated, have inspired
the concept of metal criticality. We here characterize the criticality of 62
metals and metalloids in a 3D "criticality space" consisting of supply risk,
environmental implications, and vulnerability to supply restriction. Contributing
factors that lead to extreme values include high geopolitical concentration of
primary production, lack of available suitable substitutes, and political
instability. The results show that the limitations for many metals important in
emerging electronics (e.g., gallium and selenium) are largely those related to
supply risk; those of platinum group metals, gold, and mercury, to environmental
implications; and steel alloying elements (e.g., chromium and niobium) as well as
elements used in high-temperature alloys (e.g., tungsten and molybdenum), to
vulnerability to supply restriction. The metals of most concern tend to be those
available largely or entirely as byproducts, used in small quantities for highly
specialized applications, and possessing no effective substitutes.