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Corundum is the name for a structure prototype in inorganic solids, derived from the namesake polymorph of aluminum oxide (α-Al2O3).[1] Other compounds, especially among the inorganic solids, exist in corundum structure, either in ambient or other conditions. Corundum structures are associated with metal-insulator transition,[2] ferroelectricity,[3] polar magnetism,[4][5] and magnetoelectric effects.

Structure

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The corundum structure has the space group R3c. It typically exists in binary compounds of the type A2B3, where A is metallic and B is nonmetallic, including sesquioxides (A2O3),[6] sesquisulfides (A2S3),[7] etc. When A is nonmetallic and B is metallic, the structure becomes the antiphase of corundum, called the anticorundum structure type,[8] with examples including β-Ca3N2[9] and borates. Ternary and multinary compounds can also exists in the corundum structure. The corundum-like structure with the composition A2BB'O6 is called double corundum.[4] A list of examples are tabulated below.

Crystal structure of corrundum. The unit cell contains 16 formulas R2W3 (R=red, W=white). Each red atom is surrounded by six white atoms, and each white by four red.
Materials that exist in the corundum structure
Chemical formula Alternative name Material type Reference
Al2O3 α-Al2O3 or corundum Oxide [1]
V2O3 Oxide [2][10]
Cr2O3 α-Cr2O3 Oxide [10]
Fe2O3 α-Fe2O3 or hematite Oxide [10]
Ga2O3 α-Ga2O3 Oxide [11]
In2O3 rh-In2O3 Oxide [12][13]
Ti2O3 α-Ti2O3 Oxide [14]
Mn2O3 ε-Mn2O3 Oxide [15]
Rh2O3 Oxide [16]
Ir2O3 α-Ir2O3 Oxide [17]
Tl2O3 Oxide [18]
Ca3N2 β-Ca3N2 Nitride [9]
In2S3 ε-In2S3 Sulfide [19]
Tm2S3 E-Tm2S3 or ε-Tm2S3 Sulfide [20]
Yb2S3 E-Yb2S3 or ε-Yb2S3 Sulfide [21]
Lu2S3 E-Lu2S3 or ε-Lu2S3 Sulfide [22]
Cr2(CN2)3 Carbodiimide [23]
Yb2(CN2)3 Carbodiimide [24]
Ca3(BO3)2 Borate [25]
Sr3(BO3)2 Borate [26]
Eu3(BO3)2 Borate [27]
ScFeO3 Ferrite [28]
GaFeO3 Ferrite [29]
InFeO3 Ferrite [30]
CrTiO3 Titanate [31]
NiCrO3 Chromite [32]
InVO3 Vanadate [33]
Ni3TeO6 Double oxide [34]
Ni2InSbO6 Double oxide [35]
Ni2ScSbO6 Double oxide [35]
Mn2FeMoO6 Double oxide [36]
Mn2FeWO6 Double oxide [37]
Co4Ta2O9 Triple oxide [38][39]

See also

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References

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  1. ^ a b Pauling, Linus; Hendricks, Sterling B. (1925-03-05). "The crystal structures of hematite and corundum". Journal of the American Chemical Society. 47 (3): 781–790. doi:10.1021/ja01680a027. ISSN 0002-7863.
  2. ^ a b Tanaka, Arata (2002). "Electronic Structure and Phase Transition in V2O3 : Importance of 3 d Spin-Orbit Interaction and Lattice Distortion". Journal of the Physical Society of Japan. 71 (4): 1091–1107. arXiv:cond-mat/0201407. Bibcode:2002JPSJ...71.1091T. doi:10.1143/JPSJ.71.1091. ISSN 0031-9015. S2CID 119014386.
  3. ^ Ye, Meng; Vanderbilt, David (2016-04-04). "Ferroelectricity in corundum derivatives". Physical Review B. 93 (13): 134303. arXiv:1602.03852. Bibcode:2016PhRvB..93m4303Y. doi:10.1103/PhysRevB.93.134303. ISSN 2469-9950. S2CID 56429009.
  4. ^ a b Cai, Guo-Hong; Greenblatt, Martha; Li, Man-Rong (2017-07-11). "Polar Magnets in Double Corundum Oxides". Chemistry of Materials. 29 (13): 5447–5457. doi:10.1021/acs.chemmater.7b01567. ISSN 0897-4756.
  5. ^ P N, Ravi Shankar; Mishra, Swarnamayee; Athinarayanan, Sundaresan (2020-04-01). "Polar magnetic oxides from chemical ordering: A new class of multiferroics". APL Materials. 8 (4): 040906. Bibcode:2020APLM....8d0906P. doi:10.1063/5.0003305. ISSN 2166-532X. S2CID 216480507.
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  39. ^ Chaudhary, S.; Srivastava, P.; Kaushik, S.D.; Siruguri, V.; Patnaik, S. (2019-04-01). "Nature of magnetoelectric coupling in corundum antiferromagnet Co4Ta2O9". Journal of Magnetism and Magnetic Materials. 475: 508–513. arXiv:1707.03127. Bibcode:2019JMMM..475..508C. doi:10.1016/j.jmmm.2018.09.071. S2CID 119445458.
source: https://en.wikipedia.org/wiki/Corundum_(structure)

One thought on “Cannabaceae”

  1. Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
    View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction

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