Oxybismuthides

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Oxybismuthides or bismuthide oxides are chemical compounds formally containing the group BiO, with one bismuth and one oxygen atom. The bismuth and oxygen are not bound together as in bismuthates, instead they make a separate presence bound to the cations (metals), and could be considered as a mixed bismuthide-oxide compound. So a compound with OmBin requires cations to balance a negative charge of 2m+3n. The cations will have charges of +2 or +3. The trications are often rare earth elements or actinides. They are in the category of oxypnictide compounds.

Many of the bismuthide oxides have bismuth in an unusual −2 oxidation state. The ones with Ln2BiO2 have the anti-ThCr2Si2 structure. They include alternating layers of LnO (anti-fluorite-type) and LnBiO. The Eu4Bi2O has an anti-K2NiF4 structure, the same as for Na2Ti2As2O. Some other compounds contain calcium and a rare earth CaRE3BiO4, and Ca2RE8Bi3O10.[1]

Some of these compounds are superconductors at very low temperatures and many are semiconductors at standard conditions.[1]

Examples

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formula name mw structure space group cell appearance properties supercondicting Tc reference
Ti8BiO7 octatitanium bismuthide heptoxide orthorhombic Cmmm I = 7.8473 Å, b = 16.829 Å, c = 3.0256 Å silver conductor [2]
(SrF)2Ti2Bi2O tetragonal I4/mmm [3]
BaTi2Bi2O tetragonal a = 4.046 Å, c = 7.272 Å [4]
LaNiBiO Lanthanum nickel oxybismuthide 4.2 [5]
Ce2O2Bi tetragonal I4/mmm a=4.034 c=13.736 [1][6]
Nd2BiO2 529.46 tetragonal I4/mmm a=399.11 c = 1366.3 V=217.53 dark grey [7]
Tb2BiO2 558.82 tetragonal I4/mmm a=389.62 c=1331.7 V=202.16 dark grey [7]
Dy2BiO2 565.98 tetragonal I4/mmm a=387.61 c=1323.3 V=198.82 dark grey [7]
Ho2BiO2 570.84 tetragonal I4/mmm a=385.83 c=1321.8 V=196.77 dark grey [7]
La2BiO2 tetragonal I4/mmm a=4.08083 c=13.9866 V=198.74 [8]
Er2BiO2 tetragonal I4/mmm a=3.84531 c=13.1513 V=194.48 [8]
(EuF)2Ti2Bi2O tetragonal I4/mmm a=4.1172 c=21.2718 [3]
Gd2BiO2 tetragonal I4/mmm a=3.9181 c=13.4246 V=206.09 [9]
Y2BiO2 tetragonal I4/mmm a=3.8734 c=13.2469 V=198.74 [9]
Pr2BiO2 tetragonal I4/mmm [9]
Nd2BiO2 tetragonal I4/mmm a=3.99258 c=13.6663 V=217.851 [9]
Ho2BiO2 tetragonal I4/mmm a=3.86212 c=13.2262 V=197.28 [9]
Sm2BiO2 tetragonal I4/mmm a=3.95296 c=13.5083 V=211.074 [9]
Sm4Bi2O [10]
Eu4Bi2O [1]
Ba2Cd2.13Bi3O Dibarium tricadmium bismuthide(-I,-III) oxide tetragonal I4/mmm a = 4.7396 c = 43.601 V=979.5 Z=4 black [11]
Gd3BiO3 monoclinic C2/m [12]
Gd8Bi3O8 monoclinic C2/m grey [12]
Ca2RE7Bi5O5 grey [1]
Cm2BiO2 tetragonal I4/mmmm a=3.957 c=13.359 [13]
Am2BiO2 Americium dioxybismuthide orthorhombic Pnam a=5.053 b=8.092 c=5.738 [14]

References

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