Structures and Properties of the Perovskite-Type Compounds Na1−xSrxNbO3 (0.1≤x≤0.9)—From Insulating to Metallic Conductivity

Istomin, S.Ya.; Svensson, Gunnar; Köhler, Jürgen

doi:10.1006/jssc.2002.9603

Cited by 7 publications

(5 citation statements)

References 17 publications

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“…and Na ? cations have similar oxygen coordination geometries and a similar situation has also been previously observed in the structures of Sr 0.3 Na 0.7 NbO 3 [13], Sr 0.3 Na 0.7 TaO 3 [14], and Sr 3.67 Na 0.33 PtO 6 [15]. The NaSr 7 AlB 18 O 36 crystal has also been checked on a Rigaku AFC7R four-circle diffractometer with a slower scan rate and lower intensity limitation, no symmetry lower than rhombohedral or a larger unit cell that would allow Sr 2?…”

Section: X-ray Crystallographysupporting

confidence: 72%

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

Chen

Chang

et al. 2014

J Chem Crystallogr

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A new sodium strontium aluminoborate, NaSr 7 AlB 18 O 36 , has been synthesized by high-temperature solution reaction at 860°C. Its crystal structure was established by single-crystal X-ray diffraction technique: the space group R " 3c (No. 167), cell parameters a = 11.356(2) Å , c = 36.655 (7) Å , V = 4093.7(12) Å 3 , and Z = 6. It is isostructural with Sr 8 MgB 18 O 36 and the crystal structure consists of the cyclic B 18 O 36 18-building unit of corner-sharing twelve BO 3 triangles and six BO 4 tetrahedra. Each B 18 O 36 18-group is bonded to six octahedrally coordinated Al 3? centers via Al-O bonds to generate a 3D 3 1 [Al(B 18 O 36 )] 15-framework that has intersecting open channels occupied by Sr 2? /Na ? cations.The IR spectrum has further confirmed that the compound contains low symmetric BO 3 and BO 4 groups; UV-Vis diffuse reflectance spectrum revealed an optical band gap of about 3.65 eV; while solid-state fluorescence spectrum exhibited a broad emission band with the emitted main peak localized at about 533.3 nm and shoulder at 420 nm upon excitation by laser of 325 nm.

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Section: X-ray Crystallographysupporting

confidence: 72%

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

Chen

Chang

et al. 2014

J Chem Crystallogr

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“…Niobates and tantalates in the A O− A 2 ′O− M 2 O 5 − system ( A = Ca 2+ , Sr 2+ , Ba 2+ ; A ′ = Li + , Na + , Rb + ; M = Nb 5+ /Nb 4+ , Ta 5+ /Ta 4+ ) commonly crystallize in the perovskite or perovskite-related structure types, including Ca 2 A′M 3 O 10 ( A′ = Li + , Na + , K + , Rb + , Cs + , NH 4 + , Tl + ; M = Nb 5+ , Ta 5+ ), − Ca 2 A′ 2 Ta 3 O 10 ( A′ = Li, Na), Li 2 x Ca 0.5− x TaO 3 , Li 0.2 (Ca 1− y Sr y ) 0.4 TaO 3 , Ca 4 NaNb 5 O 17 , , Ca 2 Na 2 Nb 4 O 13 , , Sr x Na 1− x NbO 3 , Ba 4 LiM 3 O 12 , − and A 3 Na M O 6 ( M = Nb, Ta), , as well as in less commonly observed structure types including Ruddlesden−Popper-related compounds (Li 4 Sr 3 Nb 6 O 20 , Li 2 SrNb 2 O 7 ), anion-deficient pyrochlores (SrNaNb 2 O 6.5 ), rock salt structures (Ca 2 Na 3 TaO 6 ), and tetragonal tungsten bronzes (Ba 2 NaNb 5 O 15 ) . In almost all cases, polycrystalline samples of these oxides were synthesized by the traditional solid-state or ion-exchange methods, ,, while single crystals were obtained from sulfate and carbonate fluxes .…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth of Two New Photoluminescent Oxides: Sr₃Li₆Nb₂O₁₁ and Sr₃Li₆Ta₂O₁₁

et al. 2008

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Single crystals of Sr3Li6M2O11 (M = Nb, Ta) were grown out of a high-temperature Sr(OH)2/LiOH/KOH flux. The single crystal X-ray diffraction data were indexed to the orthorhombic Pmma system, with a = 10.5834(15) A, b = 8.3103(13) A, c = 5.8277(8) A, V = 512.55(13) A(3), and Z = 2 for Sr3Li6Nb2O11 and a = 10.5936(6) A, b = 8.3452(5) A, c = 5.8271(4) A, V = 515.15(6) A(3), and Z = 2 for Sr3Li6Ta2O11. The crystal structure consists of sheets of interconnected SrO8 polyhedra that are separated by M-O layers and an intervening LiO(x) polyhedral framework, representing a new structural type. The M-O layers exhibit a rare occurrence of both five- and six-coordinated M(5+) ions in the same structure. The oxides, upon excitation at 250 nm, exhibit violet emission at room temperature.

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“…26 Likewise, phases in the Na 1−x Sr x NbO 3 solid solution are insulators for x < 0.3 and semiconducting for x = 0.3 and 0.4, with a change to metallic behaviour at x = 0.5. 27 These observations combined with the data in this study suggest the niobium 4d π* bands are too narrow to allow metallic conductivity at low d-electron counts.…”

Section: Discussionmentioning

confidence: 53%

Reductive lithium insertion into B-cation deficient niobium perovskite oxides

Perejón

Hayward

2015

Dalton Trans.

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Reaction between LiH and the A(n)B(n-1)O(3n) cation deficient perovskite phases Ba(5)Nb(4)O(15), Ba(6)TiNb(4)O(18) and Ba(3)LaNb(3)O(12) proceeds by reductive lithium insertion, leading to the formation of Ba(5)LiNb(4)O(15), Ba(6)LiTiNb(4)O(18) and Ba(3)LaLiNb(3)O(12) respectively. During lithium insertion into Ba(5)Nb(4)O(15) and Ba(6)TiNb(4)O(18) the respective ccchh and cccchh stacking sequences are converted into entirely cubic stacking sequences, while the B-cation vacancy order of the two phases is faithfully converted into Li-Nb or Li-Nb/Ti cation order in the lithiated products. In contrast lithium insertion into Ba(3)LaNb(3)O(12) leads to no gross change in structure, with the inserted lithium cations displacing some of the niobium cations leading to a cation disordered material. Transport measurements indicate semiconducting behaviour consistent with variable range hopping for Ba(5)LiNb(4)O(15) and insulating behaviour for Ba(6)LiTiNb(4)O(18) and Ba(3)LaLiNb(3)O(12). Detailed analysis of the crystal structure of Ba(6)LiTiNb(4)O(18) suggests crystallographic charge ordering in this phase.

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Structures and Properties of the Perovskite-Type Compounds Na1−xSrxNbO3 (0.1≤x≤0.9)—From Insulating to Metallic Conductivity

Cited by 7 publications

References 17 publications

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

Crystal Growth of Two New Photoluminescent Oxides: Sr₃Li₆Nb₂O₁₁ and Sr₃Li₆Ta₂O₁₁

Reductive lithium insertion into B-cation deficient niobium perovskite oxides

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Structures and Properties of the Perovskite-Type Compounds Na1−xSrxNbO3 (0.1≤x≤0.9)—From Insulating to Metallic Conductivity

Cited by 7 publications

References 17 publications

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

Crystal Growth of Two New Photoluminescent Oxides: Sr3Li6Nb2O11 and Sr3Li6Ta2O11

Reductive lithium insertion into B-cation deficient niobium perovskite oxides

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Crystal Growth of Two New Photoluminescent Oxides: Sr₃Li₆Nb₂O₁₁ and Sr₃Li₆Ta₂O₁₁