Synthesis, Structure and Magnetic Properties of Monoclinic Nb12O29

2000 ◽  
Vol 658 ◽  
Author(s):  
J. E. L. Waldron ◽  
M. A. Green
Keyword(s):  
Magnetic Properties ◽  
Magnetic Order ◽  
Bulk Sample ◽  
Charge Ordering ◽  
Rapid Reduction ◽  
One Dimensional ◽  
Range Magnetic Order ◽  
A Charge ◽  
Ordering Transition ◽  
Long Range Magnetic Order

ABSTRACTThe synthesis, structure and magnetic properties of monoclinic Nb12O29 are described. The synthesis of a pure bulk sample is difficult due to the large number of other similar phases. It is achieved by rapid reduction of H-Nb2O5 with Nb metal. The compound is shown to undergo a charge ordering transition at low temperature which provokes long range magnetic order in an intriguing one dimensional arrangement.

Phase Transformations in Nd2/3Ca1/3MnO3: Effect of Y Substitution

2009 ◽  
Vol 152-153 ◽  
pp. 108-111
Author(s):  
Elena Fertman ◽  
Anatoly Beznosov ◽  
Vladimir Desnenko ◽  
Marcela Kajňaková ◽  
Alexander Feher
Keyword(s):  
Phase Transformations ◽  
Electronic Structures ◽  
Room Temperature ◽  
Magnetic Order ◽  
Charge Ordering ◽  
Range Magnetic Order ◽  
Different Types ◽  
Y Substitution ◽  
Long Range Magnetic Order ◽  
Charge Orderings

It was found that below the room temperature both parent Nd2/3Ca1/3MnO3 and doped (Nd0.9Y0.1)2/3Ca1/3MnO3 compounds exhibit a sequence of phase transformations: charge ordering, structural transformation of O-O type within the orthorhombic structure, and three magnetic transitions. Three different types of long-range magnetic order co-exist in (Nd0.9Y0.1)2/3Ca1/3MnO3 at low temperatures (as it was earlier found in Nd2/3Ca1/3MnO3): the antiferromagnetic orderings of PCE and DE types existing below ~110 K and ~60 K, respectively, and the ferromagnetic one of B type existing below ~42 K. Charge ordering occurs at 290 K in the doped compound. Diluting of Nd subsystem by Y in the parent perovskite has opposite effects on the temperatures of magnetic and charge orderings: the temperatures of all magnetic transformations are reduced in the doped compound by 20-30 K, while the charge ordering one increases by 80 K. A relationship between evolution of the phase transformation temperatures and crystal and electronic structures of the compound are analyzed.

scholarly journals Syntheses, Crystal Structure and Magnetic Properties of Tl9RETe6 (RE = Ce, Sm, Gd)

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 277
Author(s):  
Anna Isaeva ◽  
Rico Schönemann ◽  
Thomas Doert
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Dft Calculations ◽  
Magnetic Order ◽  
Earth Metal ◽  
Magnetic Data ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order ◽  
Derivatives Of

The three compounds Tl9RETe6 with RE = Ce, Sm, Gd were synthesized from the elements at 1020 K. Their isostructural crystal structures are ordered derivatives of the Tl5Te3 type with rare-earth metal and thallium occupying different Wyckoff positions. The structures can be understood as charge-ordered in accordance with the Zintl-Klemm concept: 9 Tl+ + RE3+ + 6 Te2−. DFT calculations for Tl9GdTe6, however, result in a low, but finite density of states at the Fermi level. Magnetic data confirm trivalent Gd, but indicate a small amount of Ce4+ in Tl9CeTe6; no indications for long-range magnetic order was found down to T = 2 K.

Long-range magnetic order in quasi-one-dimensional chromium-based(S=32)pyroxenes(Li,Na)Cr(Si,Ge)2O6

2005 ◽  
Vol 72 (1) ◽  
Author(s):  
A. N. Vasiliev ◽  
O. L. Ignatchik ◽  
A. N. Sokolov ◽  
Z. Hiroi ◽  
M. Isobe ◽  
...  
Keyword(s):  
Long Range ◽  
Magnetic Order ◽  
One Dimensional ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

Long-range magnetic order in quasi-one-dimensional NaCrSi2O6 and NaCrGe2O6 metal oxides

JETP Letters ◽  
2003 ◽  
Vol 78 (9) ◽  
pp. 551-554 ◽  
Author(s):  
A. N. Vasil’ev ◽  
O. L. Ignatchik ◽  
A. N. Sokolov ◽  
Z. Hiroi ◽  
M. Isobe ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Long Range ◽  
Magnetic Order ◽  
One Dimensional ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

scholarly journals Titanium Doping of the Metallic One-Dimensional Antiferromagnet, Nb12O29

Inorganics ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 66 ◽  
Author(s):  
Izabella Kruk ◽  
Joanna E. L. Waldron ◽  
Mark A. Green
Keyword(s):  
Direct Consequence ◽  
Charge Ordering ◽  
Itinerant Electron ◽  
One Dimensional ◽  
Powder Neutron Diffraction ◽  
Temperature Regimes ◽  
A Charge ◽  
Ordering Transition ◽  
Ti Doping ◽  
Ordered State

Monoclinic Nb12O29 undergoes a charge ordering transition to form antiferromagnetic Nb4+ chains (TN ~ 12 K) spaced 15.7 Å apart, which are coupled through mediation from a subset of metallic electrons which are present over all temperature regimes. We present the effects of disrupting the delicate electronic equilibrium in monoclinic Nb12O29 through doping Nb4+ (d1) with Ti4+ (d0) ions in the series, TixNb12−xO29. Powder neutron diffraction demonstrates that Ti is distributed over all of the 6 crystallographically distinct Nb positions. Magnetic susceptibility measurements reveal a rapid suppression of the magnetic ordered state on Ti doping, with a 3% percolation threshold consistent with the existence of one-dimensional Nb4+ chains. The reduction of the number of unpaired electrons on Ti4+ doping is shown to depopulate both localised and itinerant electron subsets, demonstrating that they are intrinsic to the properties of the system, which is argued to be a direct consequence of the mixture of bonding schemes within the lattice.

Magnetic properties and long-range magnetic order of Er3+ in Er2Ba 4Cu7O14.92

1998 ◽  
Vol 177-181 ◽  
pp. 517-518 ◽  
Author(s):  
G. Böttger ◽  
P. Fischer ◽  
A. Dönni ◽  
Y. Aoki ◽  
H. Sato ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Long Range ◽  
Magnetic Order ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

Magnetic excitations in the quasi-one-dimensional magnetSr0.73CuO2:Coexistence of the spin gap and long-range magnetic order

1999 ◽  
Vol 60 (13) ◽  
pp. 9260-9263 ◽  
Author(s):  
G. I. Meijer ◽  
R. S. Eccleston ◽  
H. Mutka ◽  
C. Rossel ◽  
J. Karpinski ◽  
...  
Keyword(s):  
Long Range ◽  
Magnetic Order ◽  
Magnetic Excitations ◽  
Spin Gap ◽  
One Dimensional ◽  
Range Magnetic Order ◽  
Long Range Magnetic Order

scholarly journals Emergent long-range magnetic order in ultrathin (111)-oriented LaNiO3 films

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Margaret M. Kane ◽  
Arturas Vailionis ◽  
Lauren J. Riddiford ◽  
Apurva Mehta ◽  
Alpha T. N’Diaye ◽  
...  
Keyword(s):  
Long Range ◽  
Degrees Of Freedom ◽  
Magnetic Order ◽  
Magnetic Ordering ◽  
Anomalous Hall Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Range Magnetic Order ◽  
Film Substrate ◽  
Long Range Magnetic Order

AbstractThe emergence of ferromagnetism in materials where the bulk phase does not show any magnetic order demonstrates that atomically precise films can stabilize distinct ground states and expands the phase space for the discovery of materials. Here, the emergence of long-range magnetic order is reported in ultrathin (111) LaNiO3 (LNO) films, where bulk LNO is paramagnetic, and the origins of this phase are explained. Transport and structural studies of LNO(111) films indicate that NiO6 octahedral distortions stabilize a magnetic insulating phase at the film/substrate interface and result in a thickness-dependent metal–insulator transition at t = 8 unit cells. Away from this interface, distortions relax and bulk-like conduction is regained. Synchrotron x-ray diffraction and dynamical x-ray diffraction simulations confirm a corresponding out-of-plane unit-cell expansion at the interface of all films. X-ray absorption spectroscopy reveals that distortion stabilizes an increased concentration of Ni2+ ions. Evidence of long-range magnetic order is found in anomalous Hall effect and magnetoresistance measurements, likely due to ferromagnetic superexchange interactions among Ni2+–Ni3+ ions. Together, these results indicate that long-range magnetic ordering and metallicity in LNO(111) films emerges from a balance among the spin, charge, lattice, and orbital degrees of freedom.

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