SUPERCONDUCTIVITY CHEMISTRY PROBLEMS
The following twenty problems are selected questions dealing with general
chemistry and the chemistry of the YBCO superconductor.
Give the formula weights of the following compounds.
- If a student wants to make 250 grams of YBa(2)Cu(3)O(7), how many
moles of each element will be needed?
- How many grams of each element will the student need in problem #9?
- When yttrium oxide, barium carbonate and copper(II) oxide are mixed,
annealed and cooled in an oxygen atmosphere, a YBCO compound can be
formed. Give the balanced equation for the formation of
YBa(2)Cu(3)O(7). (NOTE: When BaCO(3) is heated BaCO and
CO(2) are formed.)
- How many additional moles of O(2) need to
be added to the YBCO
compound formed in problem #11 to make it superconducting?
- Why does the YBCO material need to be cooled in a stream of oxygen
- What color should the YBCO superconductor be after it has been
- What type of superconductor is the YBCO material?
- What is the name of the crystal structure found in YBCO ceramics?
- What is the critical temperature Tc for YBa(2)Cu(3)O(7)?
- Which atoms occupy the corners of the crystal lattice of the YBCO
- If a YBCO superconductor is left unprotected in the air a chemical
reaction can occur with CO(2) and water resulting in deoxygenation of the
sample. How can you prevent this from happening?
- Bi(4)(Sr,Ca)(6)Cu(4)O(16) is another high temperature superconductor.
balance equation for the formation of Bi(4)(Sr,Ca)(6)Cu(4)O(16) from its metal oxides.
(NOTE: the moles of Sr and Ca may vary but the total mole of Sr and
Ca is equal to six).
- Briefly describe the formation of Cooper Pairs according to the BCS
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