Synthesis, structural characterization, and magnetic properties of NaRE9(GeO4)6O2 (RE = Nd, Pr)

Emirdag‐Eanes, Mehtap; Pennington, William T.; Kolis, Joseph W.

doi:10.1016/s0925-8388(03)00725-4

Cited by 22 publications

(12 citation statements)

References 7 publications

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“…The theoretical effective magnetic moment of Nd 3+ , Sm 3+ , and Gd 3+ are 3.62, 1.74, and 7.94 per Ln 3+ ion. Further, θ Similar behavior has been observed in Na 5 Ln(SiO 4 ) 4 (OH)11 and the NaLn 9 (GeO 4 ) 6 O 2 series 40.…”

supporting

confidence: 75%

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

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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.

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confidence: 75%

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

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“…In contrast to the phosphate with apatite structure, the oxygen atoms O(4) are located at the 3.874 (19) centers of the triangles formed by Eu(2) atoms, apparently due to the larger radius of silicon atoms compared to phosphorus atoms. Similar results were reported earlier for Eu 8.18 Na 1.08 (SiO 4 ) 6 (OH) 1.62-2y O y [12], as well as NaLa 9 Ge 6 O 26 [21], NaPr 9 Ge 6 O 26 , and NaNd 9 Ge 6 O 26 [22]. e interatomic distances determined for the crystalline structure studied are given in Table 3.…”

Section: Journal Of Chemistrysupporting

confidence: 87%

Sol‐Gel Synthesis, X‐Ray Diffraction Studies, and Electric Conductivity of Sodium Europium Silicate

Borisova

Игнатов

Get’man

et al. 2013

Journal of Chemistry

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Sodium europium silicate, NaEu9(SiO4)6O2, with apatite structure has been obtained and studied using X-ray diffraction and SEM. It has been shown that sodium sublimation does not take place upon synthesis by the sol-gel method. Rietveld refinement has revealed that sodium atoms are ordered and occupy the 4f position. O(4) atoms not related to silicate ions are placed at the centers of Eu(2) triangles. DC and AC electric conductivity and activation energy have been determined for the compound studied.

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“…62) with cell dimensions of a＝1.15733 (12) nm, b ＝ 0.65750 (7) nm, c ＝ 0.53013(5) nm, V ＝ 0.40340(7) nm 3 , Z＝4. The asymmetric unit of NaEu-GeO 4 contains one symmetrically independent Eu site, one symmetrically independent Ge site, and one symmetrically independent Na site as shown in Figure 1 [28][29][30]41] The symmetrically independent Na site is located on the site of symmetry centre (Wyckoff position 4a). The CCDC reference number of NaEuGeO 4 at 1 atm is 846197.…”

Section: Resultsmentioning

confidence: 99%

“…[25][26][27] In recent years, the Ge analogues of some lanthanide silicates have been prepared. Most of these lanthanide germanates are synthesized under high temperature and high pressure conditions [28,29] or through high temperature solid state reactions or using fluxgrowth techniques, [30] but only a few of them were prepared under mild hydrothermal conditions. For example, our group synthesized K 3 LnGe 3 O 8 (OH) 2 ; Ln＝Eu/Tb at 200 ℃, [31] which is a pure Ge counterpart of K 3 LnSi 3 -O 8 (OH) 2 ; Ananias et al [32] synthesized a series of mixed Si/Ge analogues of the chiral Na 3 [RESi 3 O 9 ]• 3H 2 O (RE＝Y 3＋ , Eu 3＋ ) compounds between 150 and 230 ℃.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Pressure‐induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO₄

et al. 2012

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The crystalline solid europium germanate NaEuGeO 4 was prepared under hydrothermal conditions. The in-situ photoluminescence spectroscopic measurement and the synchrotron X-ray diffraction analysis in a diamond anvil cell (DAC) under high pressure were performed to study the pressure-induced phase transition of NaEuGeO 4 as well as changes of the luminescent properties of Eu 3＋ ions. Photoluminescence spectroscopic studies revealed that a phase transition occurred at a pressure range of 6.5-10 GPa and the high-pressure phase of NaEuGeO 4 (NaEu-GeO 4 -HP) was still stable when the pressure raised up to about 20 GPa. As the pressure was released, the spectra returned to the original state, revealing that the pressure-induced phase transition is a completely reversible process. The synchrotron X-ray diffraction analysis demonstrated that the structure of NaEuGeO 4 transformed to an unidentified phase NaEuGeO 4 -HP at a pressure higher than 10 GPa, and the phase transition is reversible. This result is consisted with that obtained by photoluminescence spectra analysis.

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Synthesis, structural characterization, and magnetic properties of NaRE9(GeO4)6O2 (RE = Nd, Pr)

Cited by 22 publications

References 7 publications

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

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

Sol‐Gel Synthesis, X‐Ray Diffraction Studies, and Electric Conductivity of Sodium Europium Silicate

Synthesis and Pressure‐induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO₄

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Synthesis, structural characterization, and magnetic properties of NaRE9(GeO4)6O2 (RE = Nd, Pr)

Cited by 22 publications

References 7 publications

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

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

Sol‐Gel Synthesis, X‐Ray Diffraction Studies, and Electric Conductivity of Sodium Europium Silicate

Synthesis and Pressure‐induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO4

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Synthesis and Pressure‐induced Reversible Phase Transition of a Crystalline Solid Europium Germanate NaEuGeO₄