The scheelite form of the TbCrO4 oxide has been obtained by treating TbCrO4-zircon at 4 GPa and 823 K. X-ray and neutron diffraction data reveal that the high-pressure polymorph of TbCrO4 crystallizes with tetragonal symmetry space group I4(1)/a and lattice parameters a=5.036 74(10) angstrom and c=11.3734(4) angstrom. Although bisdisphenoids [TbO8] and tetrahedra [CrO4] are present in both scheelite and zircon polymorphs, the remarkable changes observed in both polyhedra appear to support the reconstructive model for the zircon-scheelite first-order phase transition. Specific heat and neutron diffraction measurements confirm the antiferromagnetic ordering previously proposed from magnetic susceptibility measurements, in which both Tb3+ and Cr5+ sub-lattices are involved. The magnetic structure has been determined and can be described on the basis of the coincidence between the chemical and magnetic cells, k=(0,0,0), where the magnetic moments of the Tb3+ and Cr5+ cations are antiferromagnetically aligned along the c axis of the structure, with T-N=29 K. Their values at 2 K are 8.97(3)mu(B) and 1.089(9)mu(B), respectively.
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Univ Sains Malaysia, Sch Phys, Xray Crystallog Unit, Usm 11800, Penang, MalaysiaUniv Sains Malaysia, Sch Phys, Xray Crystallog Unit, Usm 11800, Penang, Malaysia
Chia, Tze Shyang
Quah, Ching Kheng
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Univ Sains Malaysia, Sch Phys, Xray Crystallog Unit, Usm 11800, Penang, MalaysiaUniv Sains Malaysia, Sch Phys, Xray Crystallog Unit, Usm 11800, Penang, Malaysia
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Bhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, IndiaBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Gupta, Mayanak K.
Singh, Baltej
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Bhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Homi Bhabha Natl Inst, Bombay 400094, Maharashtra, IndiaBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Singh, Baltej
Mittal, Ranjan
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Bhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Homi Bhabha Natl Inst, Bombay 400094, Maharashtra, IndiaBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Mittal, Ranjan
Zbiri, Mohamed
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Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, FranceBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Zbiri, Mohamed
Cairns, Andrew B.
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European SynchrotronRadiat Facil, BP 220, F-38043 Grenoble, FranceBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Cairns, Andrew B.
Goodwin, Andrew L.
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Univ Oxford, Dept Chem, South Parks Rd, Oxford OX1 3QR, EnglandBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Goodwin, Andrew L.
Schober, Helmut
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Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, FranceBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Schober, Helmut
Chaplot, Samrath L.
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Bhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India
Homi Bhabha Natl Inst, Bombay 400094, Maharashtra, IndiaBhabha Atom Res Ctr, Solid State Phys Div, Bombay 400085, Maharashtra, India