| 词条 | Lanthanum manganite |
| 释义 |
| ImageFile = | ImageSize = | ImageAlt = | IUPACName = | OtherNames = | Section1 = {{Chembox Identifiers | CASNo = 12031-12-8 | CASNo_Ref=[1] | PubChem = | SMILES = }} | Section2 = {{Chembox Properties | Formula = LaMnO3 | MolarMass = 241.84 g/mol | Appearance = | Density = | MeltingPt = | BoilingPt = | Solubility = }} | Section3 = {{Chembox Hazards | MainHazards = | FlashPt = | AutoignitionPt = }} }}Lanthanum manganite is an inorganic compound with the formula LaMnO3, often abbreviated as LMO. Lanthanum manganite is formed in the perovskite structure, consisting of oxygen octahedra with a central Mn atom. The cubic perovskite structure is distorted into an orthorhombic structure by a strong Jahn–Teller distortion of the oxygen octahedra.[2] SynthesisLanthanum manganite can be prepared via solid-state reactions at high temperatures, using their oxides or carbonates.[3]An alternative method is to use lanthanum nitrate and manganese nitrate as raw materials. The reaction occurs at high temperature after the solvents are vaporized.[4] Lanthanum manganite alloysLanthanum manganite is an electrical insulator and an A-type antiferromagnet. It is the parent compound of several important alloys, often termed rare-earth manganites or colossal magnetoresistance oxides. These families include lanthanum strontium manganite, lanthanum calcium manganite and others. In lanthanum manganite, both the La and the Mn are in the +3 oxidation state. Substitution of some of the La atoms by divalent atoms such as Sr or Ca induces a similar amount of tetravalent Mn+4 atoms. Such substitution, or doping can induce various electronic effects, which form the basis of a rich and complex electron correlation phenomena that yield diverse electronic phase diagrams in these alloys.[5] See also
References1. ^{{cite book |last1=Macintyre |first1=Jane E. |title=Dictionary of Inorganic Compounds |date=1992 |publisher=CRC Press |isbn=9780412301209 |page=3546 |url=https://books.google.com/books?id=9eJvoNCSCRMC&pg=PA3546 |language=en}} {{lanthanum compounds}}{{manganese compounds}}{{inorganic-compound-stub}}2. ^{{cite journal |author=S. Satpathy|year=1996 |journal=Physical Review Letters |title=Electronic Structure of the Perovskite Oxides: La1−xCaxMnO3 |url=http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.76.960 |volume=76 |pages=960 |doi=10.1103/PhysRevLett.76.960 |display-authors=etal}} 3. ^{{cite journal|last1=Bockris|first1=John O'M.|last2=Otagawa|first2=Takaaki|title=Mechanism of oxygen evolution on perovskites|journal=The Journal of Physical Chemistry|volume=87|issue=15|year=2002|pages=2960–2971|issn=0022-3654|doi=10.1021/j100238a048}} 4. ^{{cite journal|last1=Liu|first1=Yuxi|last2=Dai|first2=Hongxing|last3=Du|first3=Yucheng|last4=Deng|first4=Jiguang|last5=Zhang|first5=Lei|last6=Zhao|first6=Zhenxuan|last7=Au|first7=Chak Tong|title=Controlled preparation and high catalytic performance of three-dimensionally ordered macroporous LaMnO3 with nanovoid skeletons for the combustion of toluene|journal=Journal of Catalysis|volume=287|year=2012|pages=149–160|issn=00219517|doi=10.1016/j.jcat.2011.12.015}} 5. ^{{cite book |last=Dagotto |first=E. |title=Nanoscale Phase Separation and Colossal Magnetoresistance |publisher=Springer |url=https://www.springer.com/materials/book/978-3-540-43245-6 |isbn=978-3-662-05244-0 }} 3 : Lanthanum compounds|Manganates|Perovskites |
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