Hydrothermal synthesis of new alkali silicates II. Sodium neodymium and sodium yttrium phases

Haile, Sossina M.; Wuensch, B. J.; Laudise, R.A.

doi:10.1016/0022-0248(93)90186-z

Cited by 17 publications

(12 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All of the compounds prepared by us were grown by hydrothermal methods, as described in detail elsewhere (Haile et al 1993a(Haile et al , 1993b. In general, the products were obtained in the form of microcrystalline powders from isothermal experiments, in which the temperature was held typically at 500 ЊC and the pressure at 825 bar.…”

Section: Synthesis and Phase Identificationmentioning

confidence: 99%

Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Haile

Wuensch

1997

American Mineralogist

View full text Add to dashboard Cite

The structures of four A 3 MSi 6 O 15 (•nH 2 O) silicates (A ϭ Na or K, M ϭ Nd or Y) recently determined by the authors are compared with one another and with the structures of related silicates. The 2:5 Si:O ratio in these compounds (silicate tetrahedra linked by sharing three O atoms per tetrahedron plus one unshared O atom) permits layer, double-chain, or doublering configurations. In ␣-K 3 NdSi 6 O 15 •2H 2 O, ␤-K 3 NdSi 6 O 15 , and Na 3 NdSi 6 O 15 •2H 2 O, the linkage is found to result in a corrugated layered structure, in ␤-Na 3 YSi 6 O 15 a double-chain structure, and in ␣-Na 3 YSi 6 O 15 a unique double-ring structure. Although the factors that govern the stabilities of ring vs. chain vs. layered structures remain to be completely elucidated, it is apparent in the layered structures that larger M cations (such as Nd and Ce) produce a greater degree of corrugation than do Zr and Ti cations. The more open structures of neodymium and cerium silicates contain large channels that may serve as pathways for fast alkali ion transport.

show abstract

Section: Synthesis and Phase Identificationmentioning

confidence: 99%

Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Haile

Wuensch

1997

American Mineralogist

View full text Add to dashboard Cite

show abstract

“…The precursor, a powdered glass of composition 4NazO-Nd203-17SiO2, was placed in a solvent of 0.1 M NaOH. Further details of this synthesis and the range of conditions under which the phase was formed are described elsewhere (Haile, 1992;Haile, Wuensch & Laudise, 1993).…”

Section: Crystal Growthmentioning

confidence: 99%

Structure of Na₃NdSi₆O₁₅.2H₂O – a Layered Silicate with Paths for Possible Fast-Ion Conduction

Haile¹,

Wuensch²,

Laudise³

et al. 1997

Acta Crystallogr Sect B

View full text Add to dashboard Cite

Hydrothermal investigations of the high silica region of the Na20-Nd203-SiO2 system, carried out in the search for new fast-ion conductors (FIC's), yielded the compound Na3NdSi6Ols.2H20 (sodium neodymium silicate). Single-crystal X-ray methods provided lattice constants of a=7.385(2), b=30.831(7) and c= 7.1168 (13) /~,, space group Cmm2, and 22 atoms in the asymmetric unit. With four formula units per unit cell, the calculated density is 2.68gcm -3. Refinement was carried out with 1113 independent structure factors to a weighted residual wR(F) of 2.63% [8.09% for wR(F2)] using anisotropic temperature factors for all atoms. The structure, based on corrugated Si6015 layers containing four-, five-, six-and eightmembered rings, is related to that of a model previously reported for a compound assigned the composition NaNdSi6013(OH)2.nH20. Our structure differs in the placement of sodium ions and water molecules, and contains no hydroxyl groups. We believe that both studies examined the same phase.

show abstract

“…Most of these structures are based on sodium or potassium alkali metal cations. [17][18][19] Given the massive number of corresponding transition metal and main group metal silicates, the number of alkaline earth metal or mixed alkaline/alkaline earth metal containing rare earth silicates surprisingly is somewhat limited. This opens a promising avenue of investigation of a relatively undeveloped class of new single crystals with attractive physical properties.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal synthesis, structure, and property characterization of rare earth silicate compounds: NaBa3Ln3Si6O20 (Ln = Y, Nd, Sm, Eu, Gd)

Sanjeewa

Fulle

McMillen

et al. 2015

Solid State Sciences

View full text Add to dashboard Cite

A series of new lanthanide (Ln) silicates have been synthesized using high temperature hydrothermal techniques, and structurally characterized using single crystal and powder X-ray diffraction. The compounds have the general formula NaBa 3 Ln 3 Si 6 O 20 (Ln = Y, Nd, Sm, Eu, Gd), and crystallize in the space group Ama2 (No.40). As a representative example, the unit cell parameters of NaBa 3 Gd 3 Si 6 O 20 are a = 14.731(3) Å, b = 23.864(5) Å, c = 5.5449(11) Å and Z = 4. The title compounds adopt a three dimensional polar acentric framework made of Ln−O−Si bonding. The framework is comprised of LnO 8 and LnO 7 units forming edge-sharing infinite chains along the c-axis. These oxy-bridged infinite chains are also linked by [Si 4 O 13 ] tetrasilicate and [Si 2 O 7 ] disilicate units to form the three-dimensional framework structure, with Ba 2+ and Na + cations residing inside channels of the framework. The polarity in the structure is imparted by the unusual tetrasilicate arrangement. The luminescence and magnetic properties were investigated on selected compounds. The temperature dependent magnetic susceptibility measurements on the Nd, Sm, and Gd derivatives reveal a Curie-Weiss behavior with an antiferromagnetic coupling parameter. For the Eu-derivative, the temperature dependent magnetic susceptibility deviates significantly from Curie-Weiss behavior. Luminescence properties of NaBa 3 Eu 3 Si 6 O 20 and NaBa 3 Sm 3 Si 6 O 20 compounds exhibited the characteristic transitions of Eu 3+ (5 D 0 → 7 F J , J = 0-4) and Sm 3+ (4 G 5/2 → 6 H J , J = 5/2, 7/2), respectively, leading to strong visible red and orange emissions, respectively.

show abstract

Hydrothermal synthesis of new alkali silicates II. Sodium neodymium and sodium yttrium phases

Cited by 17 publications

References 7 publications

Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Structure of Na₃NdSi₆O₁₅.2H₂O – a Layered Silicate with Paths for Possible Fast-Ion Conduction

Hydrothermal synthesis, structure, and property characterization of rare earth silicate compounds: NaBa3Ln3Si6O20 (Ln = Y, Nd, Sm, Eu, Gd)

Contact Info

Product

Resources

About

Hydrothermal synthesis of new alkali silicates II. Sodium neodymium and sodium yttrium phases

Cited by 17 publications

References 7 publications

Comparison of the crystal chemistry of selected MSi6O15-based silicates

Comparison of the crystal chemistry of selected MSi6O15-based silicates

Structure of Na3NdSi6O15.2H2O – a Layered Silicate with Paths for Possible Fast-Ion Conduction

Hydrothermal synthesis, structure, and property characterization of rare earth silicate compounds: NaBa3Ln3Si6O20 (Ln = Y, Nd, Sm, Eu, Gd)

Contact Info

Product

Resources

About

Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Comparison of the crystal chemistry of selected MSi₆O₁₅-based silicates

Structure of Na₃NdSi₆O₁₅.2H₂O – a Layered Silicate with Paths for Possible Fast-Ion Conduction