Synthesis and structural investigations of tantalates phosphates in the flux system Na&lt;inf&gt;2&lt;/inf&gt;O-P&lt;inf&gt;2&lt;/inf&gt;O&lt;inf&gt;5&lt;/inf&gt;-Ta&lt;inf&gt;2&lt;/inf&gt;O&lt;inf&gt;5&lt;/inf&gt;-MoO&lt;inf&gt;3&lt;/inf&gt;

Odynets, Ievgen V.; Doroshenko, O.M.; Babaryk, Artem A.; Slobodyanik, Nikolay S.; Khainakov, Sergei A.; Baumer, V. N.

doi:10.1109/omee.2012.6464779

Cited by 1 publication

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“…The P atom is bonded to four oxygen atoms in the form of a PO 4 tetrahedron with bond lengths of 1.522(2)–1.544(2) Å (Figure a). All bond distances fall within the rational ranges. − …”

Section: Resultsmentioning

confidence: 81%

“…28 Nb/Ta, by virtue of the same octahedral coordination, is able to substitute W in the bronzes and form isotypic structures, namely, niobium/tantalum phosphate bronzes. A series of niobium/tantalum phosphate bronzes were successively found, such as Na Na 2 Ta 6 P 4 O 26 , 32 and Na 3 Ta 7 P 4 O 29 . 32 K 3 Nb 6 P 4 O 26 shows typical anisotropic semiconduction and Curie-like magnetic character.…”

Section: ■ Introductionmentioning

confidence: 99%

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Polymorphism of Niobium Phosphate Bronze Na₄Nb₈P₄O₃₂Deduced by the Packings of Structural Units: A Centrosymmetric Phase

Zhou,

Gong,

et al. 2024

Inorg. Chem.

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Herein, a new centrosymmetric phase Na 4 Nb 8 P 4 O 32 (referred to as CS-Na 4 Nb 8 P 4 O 32 ) was obtained by a molten salt method, which is a polymorph of niobium phosphate bronze Na 4 Nb 8 P 4 O 32 . CS-Na 4 Nb 8 P 4 O 32 displays high structural similarity to the noncentrosymmetric Na 4 Nb 8 P 4 O 32 phase (referred to as NCS-Na 4 Nb 8 P 4 O 32 ): Distorted NbO 6 octahedra are cornercoordinated to form ReO 3 -type layers, which are further joined together by isolated PO 4 tetrahedra. However, two polymorphous phases adopt different packings of structural units, resulting in distinct symmetries. NbO 3 layers and PO 4 tetrahedra are reversely arranged along the crystallographic a direction in CS-Na 4 Nb 8 P 4 O 32 , thereby producing a centrosymmetric structure. The reverse packing cancels out all contributions of dipole moments originating from the distorted NbO 6 octahedra; NCS-Na 4 Nb 8 P 4 O 32 exhibits the C2-rotation distribution of NbO 3 layers and PO 4 tetrahedra, thus generating a noncentrosymmetric and polar structure. The C2rotation packing of structural units brings a constructive addition of the dipole moments, further obtaining large calculated independent second harmonic generation susceptibilities. The study of structural evolution deduced by the packings of structural units in polymorphous Na 4 Nb 8 P 4 O 32 might provide valuable insights into polymorphism and structural regulation.

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Section: Resultsmentioning

confidence: 81%

Section: ■ Introductionmentioning

confidence: 99%

Polymorphism of Niobium Phosphate Bronze Na₄Nb₈P₄O₃₂Deduced by the Packings of Structural Units: A Centrosymmetric Phase

Zhou,

Gong,

et al. 2024

Inorg. Chem.

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Synthesis and structural investigations of tantalates phosphates in the flux system Na<inf>2</inf>O-P<inf>2</inf>O<inf>5</inf>-Ta<inf>2</inf>O<inf>5</inf>-MoO<inf>3</inf>

Cited by 1 publication

References 6 publications

Polymorphism of Niobium Phosphate Bronze Na₄Nb₈P₄O₃₂Deduced by the Packings of Structural Units: A Centrosymmetric Phase

Polymorphism of Niobium Phosphate Bronze Na₄Nb₈P₄O₃₂Deduced by the Packings of Structural Units: A Centrosymmetric Phase

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Synthesis and structural investigations of tantalates phosphates in the flux system Na<inf>2</inf>O-P<inf>2</inf>O<inf>5</inf>-Ta<inf>2</inf>O<inf>5</inf>-MoO<inf>3</inf>

Cited by 1 publication

References 6 publications

Polymorphism of Niobium Phosphate Bronze Na4Nb8P4O32Deduced by the Packings of Structural Units: A Centrosymmetric Phase

Polymorphism of Niobium Phosphate Bronze Na4Nb8P4O32Deduced by the Packings of Structural Units: A Centrosymmetric Phase

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Polymorphism of Niobium Phosphate Bronze Na₄Nb₈P₄O₃₂Deduced by the Packings of Structural Units: A Centrosymmetric Phase

Polymorphism of Niobium Phosphate Bronze Na₄Nb₈P₄O₃₂Deduced by the Packings of Structural Units: A Centrosymmetric Phase