Difference between revisions of "Lanthanum manganite"
Physchim62 (talk | contribs) (→References) |
Physchim62 (talk | contribs) |
||
Line 1: | Line 1: | ||
+ | {{chembox | ||
+ | | IUPACName = lanthanum oxide—manganese(III) oxide (1/1) | ||
+ | | Section1 = {{Chembox Identifiers | ||
+ | | InChI=1/La.Mn.3O/q2*+3;3*-2 | ||
+ | }} | ||
+ | | Section2 = {{Chembox Properties | ||
+ | | Formula = LaMnO<sub>3</sub> | ||
+ | | MolarMass = 241.84 g mol<sup>−1</sup> | ||
+ | }} | ||
+ | | Section3 = {{Chembox Structure | ||
+ | | CrystalStruct = [[Perovskite (structure)|Perovskite]] | ||
+ | | Coordination = Distorted octahedral (Mn<sup>3+</sup>) | ||
+ | }} | ||
+ | }} | ||
'''Lanthanum manganite''', LaMnO<sub>3</sub>, is a [[mixed oxide]] of [[lanthanum]] and [[manganese]](III). It adopts the [[perovskite structure]]. | '''Lanthanum manganite''', LaMnO<sub>3</sub>, is a [[mixed oxide]] of [[lanthanum]] and [[manganese]](III). It adopts the [[perovskite structure]]. | ||
Latest revision as of 16:52, 19 September 2010
Lanthanum manganite | |
---|---|
IUPAC name | lanthanum oxide—manganese(III) oxide (1/1) |
Identifiers | |
InChI | InChI=1/La.Mn.3O/q2*+3;3*-2 |
Properties | |
Chemical formula | LaMnO3 |
Molar mass | 241.84 g mol−1 |
Structure | |
Crystal structure | Perovskite |
Coordination geometry | Distorted octahedral (Mn3+) |
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
Lanthanum manganite, LaMnO3, is a mixed oxide of lanthanum and manganese(III). It adopts the perovskite structure.
Lanthanum manganite is usually encountered doped with monovalent or (especially) divalent metal ions such as strontium, to give a compound of formula La1−xMxMnO3, where x is typically 0.1–0.2. This forces an equivalent proportion of the manganese ions (double the portion if M is monovalent) to be oxidized from manganese(III) to manganese(IV). These doped lanthanum manganites show colossal magnetoresistance (CMR).[1][2][3] The strontium-doped material is a half-metal for x = 0.3.[4]
References
- ↑ McCormack, M.; Jin, S.; Tiefel, T. H.; Fleming, R. M.; Phillips, Julia M.; Ramesh, R. Very large magnetoresistance in perovskite-like La-Ca-Mn-O thin films. Appl. Phys. Lett. 1994, 64, 3045–47. DOI: 10.1063/1.111372.
- ↑ Gubkin, M. K.; Perekalina, T. M. Pis'ma Zh. Eksp. Teor. Fiz. 1994, 60 (10), 727–30; Nature of the giant magnetoresistance in ferromagnetic lanthanum manganates. JETP Lett. 1994, 60 (10), 747–50, <http://www.jetpletters.ac.ru/ps/1357/article_20515.pdf>.
- ↑ Ramirez, A. P. Colossal magnetoresistance. J. Phys.: Cond. Matter, 9 (39), 8171. DOI: 10.1088/0953-8984/9/39/005.
- ↑ Park, J.-H.; Vescovo, E.; Kim, H.-J.; Kwon, C.; Ramesh, R.; Venkatesan, T. Direct evidence for a half-metallic ferromagnet. Nature 1998, 392, 794–96. DOI: 10.1038/33883.
Error creating thumbnail: Unable to save thumbnail to destination |
This page is currently licensed under the Creative Commons Attribution 3.0 Unported license and any later versions of that license. |