Crystal Refinement and Magnetic Structure of KNi4(PO4)3: A Novel Example of Three Interacting Magnetic Sub‐Lattices

Lopez, M.F.; Durio, C.; Daidouh, Abdelaali; Pico, C.; Veiga, María-Luisa

doi:10.1002/chem.200305164

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…0,0 3,0x10 5 6,0x10 5 9,0x10 5 1,2x10 6 0,0 3,0x10 5 6,0x10 5 9,0x10 5 1,2x10 6 0,0 2,0x10 5 4,0x10 5 6,0x10 5 8,0x10 5 1,0x10 6 1,2x10 6 0,0 2,0x10 5 4,0x10 5 6,0x10 5 8,0x10 5 1,0x10 6 1,2x10 6 Z"(Ω) where r 0 is a constant, E a is activation energy for conduction, T is absolute temperature, and K B is Boltzmann constant. Figure 6 shows plots of log (r dcTot ) versus 1000/T of bulk electrical conductivity (r dcg ), grain boundary conductivity (r dcgb ), and total conductivity (r dctot ).…”

Section: Conductivitymentioning

confidence: 99%

“…A number of these structures have been studied; in particular, the complex structural chemistry of several orthophosphates of the general formula AM 4 (PO 4 ) 3 (A = alkali metal, M = divalent metal cation) has been studied for many years [1][2][3][4][5][6][7][8][9][10][11], and different crystal structures have been described. Orthophosphates have been extensively investigated because they show interesting properties such as ionic conductivities, optical, and magnetic behaviors [4][5][6][7][8]. Members of this series of phosphates show orthorhombic symmetries and quite similar unit cell parameters, which mainly depend on the cation sizes.…”

Section: Introductionmentioning

confidence: 99%

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Electrical properties and conduction mechanism of the NaMg4(PO4)3 compound

et al. 2016

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The NaMg 4 (PO 4 ) 3 phosphor was prepared by the conventional high-temperature solid-state reaction. The phase formation of the compound was confirmed by the powder X-ray diffraction. Electrical properties of the compound have been studied using complex impedance spectroscopy in the frequency range 209 Hz-1 MHz and temperature range 648-712 K. The AC conductivity for grain contribution was interpreted using the universal Jonscher's power law. The temperature dependence of frequency exponent s was investigated to understand the conduction mechanism in NaMg 4 (PO 4 ) 3 compound. The non-overlapping small polaron tunneling model can explain the temperature dependence of the frequency exponent, and it was a closely good model to describe the dominant conduction mechanism.

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Section: Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical properties and conduction mechanism of the NaMg4(PO4)3 compound

et al. 2016

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“…[1][2][3][4][5][6][7][8][9] They are built up from NiO 6 octahedra and PO 4 tetrahedra. These basic building blocks are connected via common oxygen atoms to form the three-dimensional frameworks and the alkali metal ions reside in the empty space.…”

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confidence: 99%

Synthesis and Characterization of New Nickel Phosphates, ANi₄(PO₄)₃(A=K, Rb)

Im¹,

Kim²,

Yun

2014

Bulletin of the Korean Chemical Society

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Quaternary nickel orthophosphates, ANi 4 (PO 4 ) 3 (A=Alkali metals) have been extensively investigated because they show interesting properties such as ionic conductivities, optical, and magnetic behaviors.1-9 They are built up from NiO 6 octahedra and PO 4 tetrahedra. These basic building blocks are connected via common oxygen atoms to form the three-dimensional frameworks and the alkali metal ions reside in the empty space.For NaNi 4 (PO 4 ) 3 , two different structures have been reported and this can be caused by the different reaction conditions. While NaNi 4 (PO 4 ) 3 prepared as single crystals with the use of NaCl flux at 1373 K crystallizes in the space group Amam and show a partial disorder of one of the PO 4 tetrahedra, 3 NaNi 4 (PO 4 ) 3 and KNi 4 (PO 4 ) 3 synthesized with alkali metal nitrate at 1073 K as powders adopt an ordered structure with the space group Pnnm.4 As far as we know, no structural studies of KNi 4 (PO 4 ) 3 from single crystal diffraction data have been reported yet and RbNi 4 (PO 4 ) 3 is a new compound. In this paper we report on the synthesis and structural investigations using single crystals of two nickel orthophosphates, KNi 4 (PO 4 ) 3 and RbNi 4 (PO 4 ) 3 . ExperimentalSynthesis. KNi 4 (PO 4 ) 3 : KNi 4 (PO 4 ) 3 was prepared by the reaction of elements with the use of the reactive halide-flux technique. A combination of the pure elements, Ni powder (Alfa Aesar 99.8%), S powder(Sigma-Aldrich) and P powder (SigmaAldrich 99%) were mixed in a fused silica tube in molar ratio of Ni:P:S=4:5:6 and then KCl (Alfa Aesar 99%) was added. The mass ratio of the reactants and the halide was 1:3. The tube was evacuated to 0.133 Pa, sealed, and heated gradually (30 K/h) to 1023 K, where it was kept for 72 h. The tube was cooled to room temperature at the rate of 6 K/h.RbNi 4 (PO 4 ) 3 : RbNi 4 (PO 4 ) 3 was prepared by the reaction of elements with the use of the reactive halide-flux technique. A combination of the pure elements, Ni powder (Alfa Aesar 99.8%), Se powder (Sigma-Aldrich) and P powder (Sigma-Aldrich 99%) were mixed in a fused silica tube in molar ratio of Ni:P:Se=3:4:8 and then RbCl (Alfa Aesar 99%) was added. The mass ratio of the reactants and the halide was 1:2. The tube was evacuated to 0.133 Pa, sealed, and heated gradually (20 K/h) to 923 K, where it was kept for 72 h. The tube was cooled to room temperature at the rate of 12 K/h.In both cases, the excess halide was removed with distilled water and yellow needle-shaped crystals were obtained. The role of chalcogens in the reactions is not clear but it is helpful to obtain the product as single crystals. The crystals are stable in air and water. A qualitative X-ray fluorescence analysis of the crystals indicated the presence of K or Rb, Ni, and P. The compositions of the compounds were determined by single-crystal X-ray diffraction.Crystallographic Studies. The structures of ANi 4 (PO 4 ) 3 (A=K, Rb) were determined by single crystal X-ray diffraction methods. Preliminary examination and data collection were performed ...

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A Comparison of the Magnetic Structures of KMn₄(PO₄)₃ and KCo₄(PO₄)₃ Based on the Connectivity of the Coordination Polyhedra

López

Daidouh

Pico

et al. 2008

Chemistry A European J

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The crystal structures of KMn(4)(PO(4))(3) and KCo(4)(PO(4))(3) have been determined by neutron diffraction at room temperature. Both compounds are orthorhombic with similar cell parameters, but they crystallize in different space groups, Pnam for the Mn phosphate and Pnnm for the Co analogue. On the basis of the metal cation polyhedra and their connectivity, the crystal structures have been rationalised, which allow interpretation of the main magnetic interactions between them. Magnetic measurements show ferromagnetic behaviour for the Co compound, whereas in the Mn derivative antiferromagnetism is observed. Both magnetic structures are described and qualitatively analysed in terms of superexchange and super-superexchange interactions.

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Crystal Refinement and Magnetic Structure of KNi₄(PO₄)₃: A Novel Example of Three Interacting Magnetic Sub‐Lattices

Cited by 5 publications

References 28 publications

Electrical properties and conduction mechanism of the NaMg4(PO4)3 compound

Electrical properties and conduction mechanism of the NaMg4(PO4)3 compound

Synthesis and Characterization of New Nickel Phosphates, ANi₄(PO₄)₃(A=K, Rb)

A Comparison of the Magnetic Structures of KMn₄(PO₄)₃ and KCo₄(PO₄)₃ Based on the Connectivity of the Coordination Polyhedra

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Crystal Refinement and Magnetic Structure of KNi4(PO4)3: A Novel Example of Three Interacting Magnetic Sub‐Lattices

Cited by 5 publications

References 28 publications

Electrical properties and conduction mechanism of the NaMg4(PO4)3 compound

Electrical properties and conduction mechanism of the NaMg4(PO4)3 compound

Synthesis and Characterization of New Nickel Phosphates, ANi4(PO4)3(A=K, Rb)

A Comparison of the Magnetic Structures of KMn4(PO4)3 and KCo4(PO4)3 Based on the Connectivity of the Coordination Polyhedra

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Crystal Refinement and Magnetic Structure of KNi₄(PO₄)₃: A Novel Example of Three Interacting Magnetic Sub‐Lattices

Synthesis and Characterization of New Nickel Phosphates, ANi₄(PO₄)₃(A=K, Rb)

A Comparison of the Magnetic Structures of KMn₄(PO₄)₃ and KCo₄(PO₄)₃ Based on the Connectivity of the Coordination Polyhedra