L. J. Jongh and A. R. Miedema, Experiments on simple magnetic model systems, Advances in Physics, vol.73, issue.1, pp.1-260, 1974.
DOI : 10.1103/PhysRevB.5.2615

S. M. Eicher, J. E. Greedan, and K. J. Lushington, The magnetic properties of FeTa2O6. Magnetic structure and low-dimensional behavior, Journal of Solid State Chemistry, vol.62, issue.2, p.220, 1986.
DOI : 10.1016/0022-4596(86)90235-5

J. N. Reimers, J. E. Greedan, C. V. Stager, and R. K. Kremer, Crystal structure and magnetism in CoSb2O6 and CoTa2O6, Crystal structure and magnetism in CoSb 2 O 6 and CoTa 2 O 6, p.20, 1989.
DOI : 10.1016/0022-4596(89)90049-2

H. Ehrenberg, G. Wltschek, J. Rodriguez-carvajal, and T. Vogt, Magnetic structures of the tri-rutiles NiTa2O6 and NiSb2O6, Journal of Magnetism and Magnetic Materials, vol.184, issue.1, p.111, 1998.
DOI : 10.1016/S0304-8853(97)01122-0

M. Takano and T. Takada, Magnetic properties of MTa2O6 (M = Fe, Co or Ni), Materials Research Bulletin, vol.5, issue.6, p.449, 1970.
DOI : 10.1016/0025-5408(70)90084-X

R. K. Kremer, J. E. Greedan, E. Gmelin, W. Dai, M. A. White et al., ) evidence for low dimensional magnetism, Specific heat of MTa, pp.0-6, 1988.

R. K. Kremer and J. E. Greedan, Magnetic ordering in CoTa2O6 and NiTa2O6, Journal of Solid State Chemistry, vol.73, issue.2, p.579, 1988.
DOI : 10.1016/0022-4596(88)90149-1

M. A. White, G. Neshvadm, =. Mg, . Fe, . Co et al., The heat capacities of the tantalates MTa, J. Chem. Thermodinamics, vol.2, issue.23, pp.0-6, 1991.

M. E. Fisher, Relation between the specific heat and susceptibility of an antiferromagnet, Philosophical Magazine, vol.79, issue.82, p.1731, 1962.
DOI : 10.1088/0034-4885/24/1/306

P. Hague, D. Visser, and D. M. Paul, Magnetic properties of tapiolite (FeTa 2 O 6 ): a quasi two-dimensional (2D) antiferromagnet, J. Phys. Condens. Matter, vol.16, p.7837, 2004.

E. Ramos, F. Fernandez, A. Jerez, C. Pico, R. R. Carvajal et al., One-dimensional antiferromagnetic ordering for a novel nickel-antimony oxide, Materials Research Bulletin, vol.27, issue.9, p.1041, 1992.
DOI : 10.1016/0025-5408(92)90242-R

A. M. Nakua and J. E. Greedan, Single crystal growth of transition metal antimonates AB2O6 from V2O5B2O3 fluxes, Journal of Crystal Growth, vol.154, issue.3-4, p.334, 1995.
DOI : 10.1016/0022-0248(95)00217-0

E. J. Kinast, C. A. Santos, D. Schmitt, O. Isnard, M. A. Gusmão et al., Magnetic structure of the quasi-two-dimensional compound CoTa2O6, Journal of Alloys and Compounds, vol.491, issue.1-2, p.41, 2010.
DOI : 10.1016/j.jallcom.2009.10.241
URL : https://hal.archives-ouvertes.fr/insu-00650992

B. M. Da-cunha, Multi-magnetic phases in Fe 1?x Ni x Ta 2 O 6, J. Magn. Magn. Mater, vol.320, p.125, 2008.

L. I. Zawislak, J. B. Marimon-da-cunha, A. Vasquez, and C. A. Santos, M??ssbauer study of the planar antiferromagnet FeTa2O6, Solid State Communications, vol.94, issue.5, p.345, 1995.
DOI : 10.1016/0038-1098(95)00073-9

. Vasquez, Magnetic behaviour of the antiferromagnet FeTa 2 O 6, J. Phys. Condens. Matter, vol.9, p.2295, 1997.

V. D. Mello, L. I. Zawislak, J. B. Marimom-da-cunha, E. J. Kinast, J. B. Soares et al., Structure and magnetic properties of layered Fe x Co 1?x Ta 2 O 6 compounds, J. Magn. Magn. Mater, pp.196-197, 1999.

V. Antonietti, E. J. Kinast, L. I. Zawislak, J. B. Da-cunha, and C. A. Santos, Structure refinement of mixed oxides FexCo1???xTa2O6, Journal of Physics and Chemistry of Solids, vol.62, issue.7, p.1239, 2001.
DOI : 10.1016/S0022-3697(01)00014-2

E. J. Kinast, Competições magnéticas no sistema Fe x Co 1?x Ta 2 O 6, Tese de Doutorado em Física, 2003.

S. R. De-oliveira and . Neto, Propriedades estruturais e magnéticas de compostos tetragonais do tipo A x B 1?x Ta 2 O 6 , onde A e B são metais de transição 3d, Tese de Doutorado em Física, 2008.

M. R. Paul and . Lees, Spin wave dispersion and magnons from short-range order in tapiolite (FeTa 2 O 6 ); a quasi-two-dimensional antiferromagnet, J. Phys. Condens. Matter, vol.17, p.7227, 2005.

C. Heid, H. Weitzel, F. Bourdarot, R. Calemczuk, T. Vogt et al., Magnetism in and, Journal of Physics: Condensed Matter, vol.8, issue.49, p.10609, 1996.
DOI : 10.1088/0953-8984/8/49/046

. Fuess, Magnetic phase diagram of CoNb 2 0 6 : a neutron diffraction study, J. Magn

S. Kobayashi, S. Mitsuda, M. Ishikawa, K. Miyatani, and K. Kohn, with partially released geometrical frustration, Physical Review B, vol.60, issue.5, p.3331, 1999.
DOI : 10.1103/PhysRevB.60.3331

C. Fe and . Ni, Preparação e caracterização das propriedades e estruturas magnéticas, Tese de Doutorado em Física, 2011.

R. Coldea, D. A. Tennant, E. M. Wheeler, E. Wawrzynska, D. Prabhakaran et al., Quantum Criticality in an Ising Chain: Experimental Evidence for Emergent E8 Symmetry, Science, vol.327, issue.5962, p.177, 2010.
DOI : 10.1126/science.1180085

S. Lee, R. K. Kaul, and L. Balents, Interplay of quantum criticality and geometric frustration in columbite, Nature Physics, vol.90, issue.9, p.702, 2010.
DOI : 10.1038/nphys1696

P. W. Sarvezuk, E. J. Kinast, C. V. Colin, M. A. Gusmão, J. B. Da-cunha et al., compounds, Physical Review B, vol.83, issue.17, p.174412, 2011.
DOI : 10.1103/PhysRevB.83.174412
URL : https://hal.archives-ouvertes.fr/hal-00984007

E. J. Felten, P. G. Sprang, and S. Rosen, Phase Relations in the System CoNb2O6-CoTa2O6, Journal of the American Ceramic Society, vol.15, issue.4, p.273, 1966.
DOI : 10.1016/0022-1902(64)80199-8

J. Edward and . Felten, Composition dependent order-disorder phenomena in CoNb 2?x Ta x O 6 and NiNb 2?x Ta x 0 6, Mat. Res. Bull, vol.2, p.13, 1967.

C. A. Santos and J. De-oliveira, Solubility limit in the tetragonal series of the Fe(TaxNb1???x)2O6 system, Solid State Communications, vol.82, issue.2, p.89, 1992.
DOI : 10.1016/0038-1098(92)90678-3

M. López-blanco, U. Amador, and F. García-alvarado, Structural characterization and electrical properties of NiNb2???xTaxO6 (0???x???2) and some Ti-substituted derivatives, Journal of Solid State Chemistry, vol.182, issue.7, p.1944, 2009.
DOI : 10.1016/j.jssc.2009.04.038

J. C. Jaime, W. L. Cooley, L. Hults, D. J. Morales, J. L. Thoma et al., Critical examination of heat capacity measurements made on a Quantum Design physical property measurement system, Cryogenics, vol.43, p.369, 2003.

F. Bourée and J. Rodríguez, Structures magn??tiques, diffraction de neutrons et sym??trie, ??tudes Structurales par Diffraction des Neutrons, p.65, 2008.
DOI : 10.1051/sfn:2008006

J. Rodriguez, Recent advances in magnetic structure determination by neutron powder diffraction, Physica B: Condensed Matter, vol.192, issue.1-2, p.55, 1993.
DOI : 10.1016/0921-4526(93)90108-I

D. C. Mattis, The Theory of Magnetism, 1965.

C. Fan and F. Y. Wu, Ising Model with Second-Neighbor Interaction. I. Some Exact Results and an Approximate Solution, Physical Review, vol.179, issue.2, p.560, 1969.
DOI : 10.1103/PhysRev.179.560

J. B. Goodenough, An interpretation of the magnetic properties of the perovskite-type mixed crystals La1???xSrxCoO3?????, Journal of Physics and Chemistry of Solids, vol.6, issue.2-3, p.287, 1958.
DOI : 10.1016/0022-3697(58)90107-0

J. B. Goodenough, Magnetism and the Chemical Bond, 1963.

J. Kanamori, Superexchange interaction and symmetry properties of electron orbitals, Journal of Physics and Chemistry of Solids, vol.10, issue.2-3, 1959.
DOI : 10.1016/0022-3697(59)90061-7

J. Villain, La structure des substances magnetiques, Journal of Physics and Chemistry of Solids, vol.11, issue.3-4, 1959.
DOI : 10.1016/0022-3697(59)90231-8

T. A. Kaplan, Classical Theory of Spin Configurations in the Cubic Spinel, Physical Review, vol.119, issue.5, p.1460, 1960.
DOI : 10.1103/PhysRev.119.1460

D. H. Lyons and T. A. Kaplan, Method for Determining Ground-State Spin Configurations, Physical Review, vol.120, issue.5, p.1580, 1960.
DOI : 10.1103/PhysRev.120.1580

M. J. Freiser, Thermal Variation of the Pitch of Helical Spin Configurations, Physical Review, vol.123, issue.6, 1961.
DOI : 10.1103/PhysRev.123.2003

D. H. Lyons, T. A. Kaplan, K. Dwight, and N. Menyuk, Classical Theory of the Ground Spin-State in Cubic Spinels, Physical Review, vol.126, issue.2, p.540, 1962.
DOI : 10.1103/PhysRev.126.540

E. F. Bertaut, Configurations magn??tiques. M??thode de fourier, Journal of Physics and Chemistry of Solids, vol.21, issue.3-4, p.256, 1961.
DOI : 10.1016/0022-3697(61)90105-6

E. F. Bertaut, Configurations magn??tiques. la m??thode directe, Journal of Physics and Chemistry of Solids, vol.21, issue.3-4, p.295, 1961.
DOI : 10.1016/0022-3697(61)90108-1

P. Bak, Commensurate phases, incommensurate phases and the devil's staircase, Reports on Progress in Physics, vol.45, issue.6, p.587, 1982.
DOI : 10.1088/0034-4885/45/6/001

D. H. Martin, Magnetism in solids, Ilife books Ltd, 1967.

C. Domb and M. S. Green, Series Expansions for Lattice Models, Phase Transitions and Critical Phenomena, vol.3, 1974.

L. Onsager, Crystal Statistics. I. A Two-Dimensional Model with an Order-Disorder Transition, Physical Review, vol.65, issue.3-4, p.117, 1944.
DOI : 10.1103/PhysRev.65.117