Synthesis, structure, and physical properties of layered tetragonal Mg-doped Nd2MoO6 compounds

Воронкова, В. И.; Kharitonova, E. P.; Орлова, Е.И.; Сорокина, Н. И.; Sorokin, Timofei A.; Antipin, A. M.; Baldin, Egor; Гребенев, В. В.

doi:10.1016/j.jallcom.2019.06.378

Cited by 6 publications

(25 citation statements)

References 29 publications

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“…with Pb, was found to cause drastic changes in their conductivity and other properties, as mentioned above (Voronkova et al, 2016(Voronkova et al, , 2017. Among other bivalent impurities doping Nd 2 MoO 6 , the structure with magnesium is known (Voronkova et al, 2019). According to this work, magnesium replaces molybdenum in the structure, and the compound becomes hygroscopic, which does not exclude the occurrence of proton conductivity in these compounds.…”

Section: Introductionmentioning

confidence: 89%

“…Distances between split sites: Pr1-Pr1_1 = 0.564 (11) Å , Pr1-Pr1_2 = 0.543 (9) Å , Pr1_1-Pr1_2 = 0.594 14 the process of incorporation of magnesium atoms into the structure of Nd 2 MoO 6 (Voronkova et al, 2019). Doping of Nd 2 MoO 6 single crystals with Mg leads to splitting of the Mo, Nd1 and O2 sites.…”

Section: Single Crystal X-ray Analysismentioning

confidence: 98%

“…In this work, polycrystalline samples were synthesized according to the scheme (MgO) x (Pr 2 MoO 6 ) (1-x)/2 (x is the molar fraction of magnesium oxide), which corresponds to the Pr 2 MoO 6 -MgO line in the phase diagram of the ternary system MgO-Pr 2 O 3 -MoO 3 . We used this scheme in a similar way to the work of Voronkova et al (2019), where a wide range of solid solutions for compounds with neodymium was obtained. At the same time, the composition of single crystals (Pr 2 Mo 0.974 Mg 0.026 O 5.94 ) obtained from the X-ray diffraction data deviates from the Pr 2 MoO 6 -MgO line.…”

Section: Composition Of Solid Solutionsmentioning

confidence: 99%

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Synthesis, structure and properties of layered Pr₂MoO₆-based oxymolybdates doped with Mg

Воронкова¹,

Antipin²,

Sorokin³

et al. 2020

Acta Crystallogr Sect B

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Undoped and Mg-doped Pr 2 MoO 6 oxymolybdate polycrystals and single crystals have been prepared by solid-state reactions and flux growth. The compounds have been characterized by powder X-ray diffraction, energydispersive spectroscopy, inductively coupled plasma mass spectrometry, scanning transmission electron microscopy, single crystal X-ray structure analysis, differential scanning calorimetry and thermogravimetry. The (MgO) x -(Pr 2 O 3 ) y (MoO 3 ) z (x + y + z = 1) solid solution series has been shown to extend to x = 0.03. The structure of the Mg-doped Pr 2 MoO 6 single crystals can be represented as superimposed lattices of the main matrix (Pr 2 MoO 6 ) and lattices in which Mo atoms are partially replaced by Mg. The incorporation of Mg atoms into the structure of Pr 2 MoO 6 results in the disordering of the praseodymium and oxygen lattices. Both the polycrystalline and single-crystal Mg-doped samples are hygroscopic.

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Section: Introductionmentioning

confidence: 89%

Section: Single Crystal X-ray Analysismentioning

confidence: 98%

Section: Composition Of Solid Solutionsmentioning

confidence: 99%

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Synthesis, structure and properties of layered Pr₂MoO₆-based oxymolybdates doped with Mg

Воронкова¹,

Antipin²,

Sorokin³

et al. 2020

Acta Crystallogr Sect B

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“…The conductivity of oxymolybdates does not exceed 10 -4 S cm -1 [23]. Thermogravimetry shows that molybdates Ln 2 MoO 6 (Ln = La, Pr, Nd) have hygroscopic properties up to 1000-1200 • C, which may indicate the possible proton conductivity in these compounds [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, a number of works are known in which the rare earth element in oxymolybdates with large cations is partially replaced by divalent elements-lead or magnesium [21,[24][25][26]. Solid solutions (PbO) x (Nd 2 MoO 6 ) (1-x)/2 are formed in a wide range 0 ≤ x ≤ 0.6.…”

Section: Introductionmentioning

confidence: 99%

Structure and Properties of Ln2MoO6 Oxymolybdates (Ln = La, Pr, Nd) Doped with Magnesium

et al. 2021

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The literature data and the results obtained by the authors on the study of the structure and properties of a series of polycrystalline and single-crystal samples of pure and Mg-doped oxymolybdates Ln2MoO6 (Ln = La, Pr, Nd) are analyzed. Presumably, the high-temperature phase I41/acd of Nd2MoO6 single crystals is retained at room temperature. The reason for the loss of the center of symmetry in the structures of La2MoO6 and Pr2MoO6 and the transition to the space group I4¯c2 is the displacement of oxygen atoms along the twofold diagonal axes. In all structures, Mg cations are localized near the positions of the Mo atoms, and the splitting of the positions of the atoms of rare-earth elements is found. Thermogravimetric studies, as well as infrared spectroscopy data for hydrated samples of Ln2MoO6 (Ln = La, Pr, Nd), pure and with an impurity of Mg, confirm their hygroscopic properties.

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La₂MoO₆ Oxymolybdates Doped with Sodium: Crystal Growth, Features of the Structure, and Properties

Орлова

Chernyak

Kharitonova

et al. 2021

Crystal Growth & Design

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Pure and sodium-containing lanthanum oxymolybdates were synthesized as polycrystalline samples and single crystals. The compounds have been characterized by several methods including SEM, inductively coupled plasma MS, X-ray single crystal diffraction analysis, thermogravimetry, differential scanning calorimetry, IR-spectroscopy, and impedance spectroscopy. ICP-MS has shown the presence of sodium cations in single crystals. According to X-ray diffraction analysis, sodium cations replace lanthanum atoms in the structure. The I4̅c2 (Z = 8) space group was established for sodium-containing crystals. The feature of Na-doped polycrystalline La2MoO6 samples is a reversible phase transition at about 650 °C recorded by DSC. La2MoO6 ceramics with sodium absorb water as evidenced by TG and IR-spectroscopy data. Investigated materials exhibit proton conductivity in a humid environment.

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Synthesis, structure, and physical properties of layered tetragonal Mg-doped Nd2MoO6 compounds

Cited by 6 publications

References 29 publications

Synthesis, structure and properties of layered Pr₂MoO₆-based oxymolybdates doped with Mg

Synthesis, structure and properties of layered Pr₂MoO₆-based oxymolybdates doped with Mg

Structure and Properties of Ln2MoO6 Oxymolybdates (Ln = La, Pr, Nd) Doped with Magnesium

La₂MoO₆ Oxymolybdates Doped with Sodium: Crystal Growth, Features of the Structure, and Properties

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Synthesis, structure, and physical properties of layered tetragonal Mg-doped Nd2MoO6 compounds

Cited by 6 publications

References 29 publications

Synthesis, structure and properties of layered Pr2MoO6-based oxymolybdates doped with Mg

Synthesis, structure and properties of layered Pr2MoO6-based oxymolybdates doped with Mg

Structure and Properties of Ln2MoO6 Oxymolybdates (Ln = La, Pr, Nd) Doped with Magnesium

La2MoO6 Oxymolybdates Doped with Sodium: Crystal Growth, Features of the Structure, and Properties

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Synthesis, structure and properties of layered Pr₂MoO₆-based oxymolybdates doped with Mg

Synthesis, structure and properties of layered Pr₂MoO₆-based oxymolybdates doped with Mg

La₂MoO₆ Oxymolybdates Doped with Sodium: Crystal Growth, Features of the Structure, and Properties