Local structure of multiferroic RMn2O5: Important role of the R site

Tyson, Trevor; Chen, Z.; Deleon, M.; Yoong, S.; Cheong, Sang‐Wook

doi:10.1016/j.jmmm.2009.02.017

Cited by 5 publications

(7 citation statements)

References 38 publications

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“…Even in a stream of air, an almost pure cubic BaCuO 2 phase is formed with the parameter a = 18.2791(8) Å, which is close to the known value a = 18.2772(2) Å for BaCuO 2.00 . [55] (5) heating rate 20°C/min in a flow of argon 60 mL/min, 900°C isotherm for 10 h, flow of oxygen 60 mL/min 6 [18] 40 48 12 18.284 (9) heating rate 10°C/min, 800°C isotherm for 3 h, flow of argon 20 mL/min 6 [18] 47 42 11 18.2844(21) heating rate 20°C/min, 850°C isotherm for 3 h, flow of argon 60 mL/min 6 [18] 75 20 5 18.292(6) heating rate 20°C/min, 900°C isotherm for 10 h, flow of air 60 mL/min 6 [18] 100 --18.2795 (6) heating rate 20°C/min in a flow of argon 60 mL/min, 900°C isotherm for 10 h, flow of oxygen 60 mL/min…”

Section: Methodsmentioning

confidence: 99%

“…The structure of 3 also contains two uncoordinated water molecules involved in hydrogen bonding for each {Ba 3 Cu 3 (Bumal) 6 (H 2 O) 11 } unit.…”

Section: Synthesis and Structural Studies Of 1-4mentioning

confidence: 99%

“…For a long time, lithium cobaltate has been mainly obtained by direct solid-phase synthesis at high temperatures from lithium oxide or hydroxide and cobalt carbonate or oxide, [1,2] GdMnO 3 is obtained by a solidphase reaction from the corresponding oxides followed by grinding and rebriquetting, [3] and barium cuprate is still synthesized by the sintering of oxides for many hours. [4,5] Similarly, classical solid-phase syntheses in an oxygen atmosphere are used to obtain polycrystalline samples of TbMn 2 O 5 , DyMn 2 O 5 , [6] and GdBaCo 2 O 5+x , which is a promising cathode material for solid-electrolyte high-temperature fuel cells. [7] Moreover, in comparison with solidphase syntheses, sol-gel technologies for the preparation of complex oxides from metal salts (nitrates or acetates) in the presence of polybasic carboxylic acids make it possible achieve higher sample homogenization, shorten the heat treatment time and decrease the synthesis temperature for a complex oxide with a required structure.…”

Section: Introductionmentioning

confidence: 99%

“…500°C) and it is possible to obtain oxide nanoparticles at relatively low temperatures. For example, monodispersed CoFe 2 O 4 was obtained by the thermolysis of the molecular complexes [Fe 2 CoO(Piv) 6 (HPiv) 3 ] and [Co 4 Fe 2 O 2 (Piv) 10 (MeCN) 2 ] (Piv = trimethylacetic acid anion) at 260-300°C in organic solvents in the presence of oleylamine or oleic acid. [11] The feasibility of obtaining thin Cu-Co and Ni-Cu oxide films from molecular heterometallic precursors with cubanelike structure has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…[12] The use of [Li(H 2 O)M(N 2 H 3 CO 2 ) 3 ]·H 2 O complexes as the sole precursors of LiMO 2 (M = Co, Ni) has been discussed. [13] Both bulk and thin-film LiMO 2 samples (M = Co, Ni) have been synthesized by the thermal destruction of complexes with molecular and polymeric structures with the general formula [Li 2 M 2 (Piv) 6 (L) x ] (M = Co, Ni; x = 1, 2; L = 2-amino-5-methylpyridine, 2,4-lutidine, 2,2Ј-bipyridine, triethylamine) below 500°C in an inert atmosphere. [14][15][16] The heterometallic β-diketonate [LiMn 2 (thd) 5 ] (thd = 2,2,6,6-tetramethyl-3,5-heptanedionate) is a molecular precursor (decomposition in air/oxygen at 600°C) for nanosized particles of the spinel-type oxide LiMn 2 O 4 , a cathode material for lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 99%

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The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

et al. 2015

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The reactions of CuSO4·5H2O and Ba(R2mal) [R2mal2– is the dianion of 1,1‐cyclopropanedicarboxylic acid (H2Cpdc), 1,1‐cyclobutanedicarboxylic acid (H2Cbdc), or butylmalonic (H2Bumal) acid] in water give crystals of the 3D coordination polymers [BaCu(Cpdc)2]n (1), [BaCu(Cbdc)2(H2O)]n (2) and [Ba3Cu3(Bumal)6(H2O)11]n·2n(H2O) (3). The heating of 2 in air to 200 °C for 60 min results in the removal of the coordinated water molecules to give anhydrous [BaCu(Cbdc)2]n (4). The structures of 1–3 were determined by single‐crystal XRD, and that of 4 was derived from powder XRD (XPRD) data. It was assumed that the crystal structures of the polymer complexes that we isolated were determined, to a considerable extent, by the nature of the substituent of the dicarboxylic acid. For 2, the dicarboxylic acid contains closed cyclic moieties, which are retained during dehydration to give 4. A comparative study of the thermal decomposition processes and thermal kinetics of 1–3 showed that the dehydration proceeds by a single scheme, and the bonds between the structural moieties in the anhydrous intermediates become stronger. The thermal destruction of the anhydrous compounds 1, 4 and {3} [the dehydrated intermediate of the thermal decomposition of 3, as proved by thermogravimetric analysis (TGA) data] occurs above 170 °C. The phase compositions of their solid products are determined by the thermolysis conditions, and the formation of BaCuO2 from 3 can be realized under milder conditions than those for the formation from 1 and 2.

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Section: Methodsmentioning

confidence: 99%

“…The structure of 3 also contains two uncoordinated water molecules involved in hydrogen bonding for each {Ba 3 Cu 3 (Bumal) 6 (H 2 O) 11 } unit.…”

Section: Synthesis and Structural Studies Of 1-4mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

et al. 2015

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Influence of Fe substitution on structural and magnetic features of BiMn2O5 nanostructures

Gaikwad

Goyal

Yanda

et al. 2018

Journal of Magnetism and Magnetic Materials

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Synthesis, Structure, and Magnetic Properties of Na₃LnMn₃O₃(AsO₄)₃(Ln = La, Sm, and Gd): A New 3d-4f Series Exhibiting One-Dimensional Manganese(III) Oxide Chains Connected via LnO₉Units

2009

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In attempts to synthesize compounds containing mixed lanthanide and transition metal oxide magnetic nanostructures, a new 3d-4f arsenate phase, Na(3)GdMn(3)O(3)(AsO(4))(3), was isolated using high-temperature, molten-salt methods. The X-ray single-crystal structure analysis shows that Na(3)GdMn(3)O(3)(AsO(4))(3) crystallizes in a hexagonal space group with a = 11.091(2) A, c = 5.954(1) A, and V = 634.2(2) A(3); P6(3)/m (No.176); Z = 2. The structure has been refined by full-matrix, least-squares methods to a final solution with R1 = 0.0466, wR2 = 0.1318 and GOF = 1.101. This new three-dimensional framework consists of ferromagnetic one-dimensional [MnO(4)](infinity) chains, composed of edge-shared MnO(6) units propagating along c. The GdO(9) polyhedra connect three neighboring [MnO(4)](infinity) chains via oxygen atoms. Na(3)LaMn(3)O(3)(AsO(4))(3) (1), and Na(3)SmMn(3)O(3)(AsO(4))(3) (2), the isostructural derivatives of Na(3)GdMn(3)O(3)(AsO(4))(3) (3), were synthesized to acquire additional insight into the 3d-4f magnetic couplings. The Na(3)LnMn(3)O(3)(AsO(4))(3) series reveals an increase in chiT at low temperatures upon substitution of smaller Ln(3+) ions ranging from La(3+) to Gd(3+). The increase in chiT is likely due to the magnetic nature and size of the lanthanide ions present. It was expected that the Mn-O-Mn ferromagnetic interactions would dominate as 3d-4f magnetic interactions are generally weak. The magnetic data shows that the paramagnetic Ln(3+) ions in 2 (Sm) and 3 (Gd) do significantly enhance the bulk ferromagnetism compared to that of 1 (La), suggesting sizable contributions from the 4f magnetic ions.

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Local structure of multiferroic RMn2O5: Important role of the R site

Cited by 5 publications

References 38 publications

The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

Influence of Fe substitution on structural and magnetic features of BiMn2O5 nanostructures

Synthesis, Structure, and Magnetic Properties of Na₃LnMn₃O₃(AsO₄)₃(Ln = La, Sm, and Gd): A New 3d-4f Series Exhibiting One-Dimensional Manganese(III) Oxide Chains Connected via LnO₉Units

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Local structure of multiferroic RMn2O5: Important role of the R site

Cited by 5 publications

References 38 publications

The Use of Malonate Coordination Polymers with CuII and BaII Atoms for Barium Cuprate Preparation

The Use of Malonate Coordination Polymers with CuII and BaII Atoms for Barium Cuprate Preparation

Influence of Fe substitution on structural and magnetic features of BiMn2O5 nanostructures

Synthesis, Structure, and Magnetic Properties of Na3LnMn3O3(AsO4)3(Ln = La, Sm, and Gd): A New 3d-4f Series Exhibiting One-Dimensional Manganese(III) Oxide Chains Connected via LnO9Units

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The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

The Use of Malonate Coordination Polymers with Cu^II and Ba^II Atoms for Barium Cuprate Preparation

Synthesis, Structure, and Magnetic Properties of Na₃LnMn₃O₃(AsO₄)₃(Ln = La, Sm, and Gd): A New 3d-4f Series Exhibiting One-Dimensional Manganese(III) Oxide Chains Connected via LnO₉Units