Metals in Research and Education. 40 000 tonnes of steel 500 m in length Expands during hot days to gain 2dm in height.

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Presentation transcript:

Metals in Research and Education

tonnes of steel 500 m in length Expands during hot days to gain 2dm in height

What we teach Minerals, Extraction, Steel-making, Corrosion

What we teach

What we teach ?

What we do not teach.

Intermetallics in textbooks Exerpt from a well-used textbook (2:nd ed) in Inorganic Chemistry pp (1 page out of 800+) ”Intermetallic compounds: In contrast to interstitial solid solutions of metals and nonmetals, where geometrical consideration are consistent with intuition, there is a class of solid solutions formed between two metals that are also better regarded as actual compounds despite the similarity of the electronegativities of the metals. For instance, when some liquid mixtures of metals are cooled, they form phases with definitive structures that are often unrelated to the parent structure. These phases are called intermetallic compounds. They include  -brass (CuZn) and compounds of composition Mg 2 Zn, Cu 3 Au and Na 5 Zn 21 ……….Half a page” In the third edition, nothing is changed but the text is shortened (10 lines) In the forth edition, nothing is changed but the text is expanded (13 lines and an image) It is clearly an uphill battle.

Intermetallics is not an optimal term

What are intermetallics? Intermetallics are chemical compounds. Experiment: Add sodium to mercury. What happens?

Metals as solvents

Au as a solvent for Si or In

Ni, Fe, Co as solvent for C

Zintl phases - NaTl

Zintl phases – Na 2 In

e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- Net transport Thermoelectricity

+ _ e-e- <= Heat e-e- p+p+ Thermoelectricity

What’s the use? Scalable, safe, mobile

What’s the problem? ZT=T  2 σ/K The thermopower (  ) is proportional to the rate of change of the density of states at the Fermi level. ZT is inversely proportional to the thermal conductivity.

Quasicrystals