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Pb2MnTeO6 Double Perovskite : An Antipolar Anti-ferromagnet
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- Retuerto, Maria (författare)
- Rutgers State Univ, Dept Chem & Chem Biol, 610 Taylor Rd, Piscataway, NJ 08854 USA.;CSIC, Inst Catalisis & Petr Quim, Grp Energia & Quim Sostenibles EQS, C Marie Curie 2,L10, Madrid 28049, Spain.
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- Skiadopoulou, Stella (författare)
- Acad Sci Czech Republic, Inst Phys, Na Slovance 2, Prague 18221 8, Czech Republic.
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- Li, Man-Rong (författare)
- Rutgers State Univ, Dept Chem & Chem Biol, 610 Taylor Rd, Piscataway, NJ 08854 USA.
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- Kamba, Stanislav (författare)
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- Rutgers State Univ, Dept Chem & Chem Biol, 610 Taylor Rd, Piscataway, NJ 08854 USA;CSIC, Inst Catalisis & Petr Quim, Grp Energia & Quim Sostenibles EQS, C Marie Curie 2,L10, Madrid 28049, Spain. Acad Sci Czech Republic, Inst Phys, Na Slovance 2, Prague 18221 8, Czech Republic. (creator_code:org_t)
- 2016-04-08
- 2016
- Engelska.
- Ingår i: Inorganic Chemistry. - : American Chemical Society (ACS). - 0020-1669 .- 1520-510X. ; 55:9, s. 4320-4329
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- Pb2MnTeO6, a new double perovskite, was synthesized. Its crystal structure was determined by synchrotron X-ray and powder neutron diffraction. Pb2MnTeO6 is monoclinic (I2/m) at room temperature with a regular arrangement of all the cations in their polyhedra. However, when the temperature is lowered to similar to 120 K it undergoes a phase transition from I2/m to C2/c structure. This transition is accompanied by a displacement of the Pb atoms from the center of their polyhedra due to the 6s2 lone-pair electrons, together with a surprising off-centering of Mn2+ (d5) magnetic cations. This strong first-order phase transition is also evidenced by specific heat, dielectric, Raman, and infrared spectroscopy measurements. The magnetic characterizations indicate an anti-ferromagnetic (AFM) order below TN approximate to 20 K; analysis of powder neutron diffraction data confirms the magnetic structure with propagation vector k = (0 1 0) and collinear AFM spins. The observed jump in dielectric permittivity near similar to 150 K implies possible anti-ferroelectric behavior; however, the absence of switching suggests that Pb2MnTeO6 can only be antipolar. First-principle calculations confirmed that the crystal and magnetic structures determined are locally stable and that anti-ferroelectric switching is unlikely to be observed in Pb2MnTeO6.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
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