Magnetism of β′-Gd&lt;sub&gt;2&lt;/sub&gt;(MoO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt; and photoluminescence of β′-Eu&lt;sub&gt;2&lt;/sub&gt;(MoO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;3&lt;/sub&gt; crystallized in rare-earth molybdenum borate glasses

Wang, Yong; Honma, Tsuyoshi; Doi, Yoshihiro; Hinatsu, Yukio; Komatsu, Takayuki

doi:10.2109/jcersj2.121.230

Cited by 22 publications

(9 citation statements)

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“…Self-activated phosphors are characterized by an almost complete absence of structural defects, and the precise determination of the crystal structure makes it possible to evaluate the relations between the Eu 3+ ion coordination in the lattice and spectroscopic characteristics of the compound. Simple europium stoichiometric compounds with tetrahedral MO 4 units, where M = Mo, W and S, were thoroughly studied and their applicability as highly efficient polyfunctional materials was shown [54][55][56][57][58][59][60][61][62][63][64][65][66][67]. At the same time, the properties of complex compounds of monovalent cations and rare-earth elements with tetrahedral anions are presented quite sporadically in the literature [37,[48][49][50][51]53,[68][69][70][71][72].…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

et al. 2021

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Crystalline hydrate of double cesium europium sulfate [CsEu(H2O)3(SO4)2]·H2O was synthesized by the crystallization from an aqueous solution containing equimolar amounts of 1Cs+:1Eu3+:2SO42− ions. Anhydrous salt CsEu(SO4)2 was formed as a result of the thermal dehydration of the crystallohydrate. The unusual effects observed during the thermal dehydration were attributed to the specific coordination of water molecules in the [CsEu(H2O)3(SO4)2]·H2O structure. The crystal structure of [CsEu(H2O)3(SO4)2]·H2O was determined by a single crystal X-ray diffraction analysis, and the crystal structure of CsEu(SO4)2 was obtained by the Rietveld method. [CsEu(H2O)3(SO4)2]·H2O crystallizes in the monoclinic system, space group P21/c (a = 6.5574(1) Å, b = 19.0733(3) Å, c = 8.8364(2) Å, β = 93.931(1)°, V = 1102.58(3) Å3). The anhydrous sulfate CsEu(SO4)2 formed as a result of the thermal destruction crystallizes in the monoclinic system, space group C2/c (a = 14.327(1) Å, b = 5.3838(4) Å, c = 9.5104(6) Å, β = 101.979(3) °, V = 717.58(9) Å3). The vibration properties of the compounds are fully consistent with the structural models and are mainly determined by the deformation of non-rigid structural elements, such as H2O and SO42−. As shown by the diffused reflection spectra measurements and DFT calculations, the structural transformation from [CsEu(H2O)3(SO4)2]·H2O to CsEu(SO4)2 induced a significant band gap reduction. A noticeable difference of the luminescence spectra between cesium europium sulfate and cesium europium sulfate hydrate is detected and explained by the variation of the extent of local symmetry violation at the crystallographic sites occupied by Eu3+ ions, namely, by the increase in inversion asymmetry in [CsEu(H2O)3(SO4)2]·H2O and the increase in mirror asymmetry in CsEu(SO4)2. The chemical shift of the 5D0 energy level in cesium europium sulfate hydrate, with respect to cesium europium sulfate, is associated with the presence of H2O molecules in the vicinity of Eu3+ ion.

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Section: Introductionmentioning

confidence: 99%

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

et al. 2021

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“…Furthermore, it has been demonstrated that the effective magnetic moment of μ eff = 7.87 μ B and the Weiss constant of θ = −0.7 K in GM15B glass are close to the values of μ eff = 7.94 μ B and θ = −0.3 K in β′-Gd 2 (MoO 4 ) 3 crystals formed in GM15B glass [22]. It has also been found that the concentration quenching of the photoluminescence of Eu 3+ ions in β′-Eu 2 (MoO 4 ) 3 crystals formed in 22.5Eu 2 O 3 -47.5MoO 3 -30B 2 O 3 glass is low [22]. These studies apparently support the results of the present study: the distance of the nearest-neighbor Gd-Gd pairs in the GM15B glass is short compared to that in the β-GMO and β′-GMO crystals.…”

Section: Resultsmentioning

confidence: 60%

“…The magnetic susceptibility and specific heat of GM15B glass have been examined in the temperature range of T = 1.8-300 K, and it has been clarified that Gd 3+ ions are distributed homogeneously and randomly as paramagnetic ions at temper atures as low as 1.8 K without inducing any strong magnetic interaction [21]. Furthermore, it has been demonstrated that the effective magnetic moment of μ eff = 7.87 μ B and the Weiss constant of θ = −0.7 K in GM15B glass are close to the values of μ eff = 7.94 μ B and θ = −0.3 K in β′-Gd 2 (MoO 4 ) 3 crystals formed in GM15B glass [22]. It has also been found that the concentration quenching of the photoluminescence of Eu 3+ ions in β′-Eu 2 (MoO 4 ) 3 crystals formed in 22.5Eu 2 O 3 -47.5MoO 3 -30B 2 O 3 glass is low [22].…”

Section: Resultsmentioning

confidence: 80%

Structural origin of high-density Gd₂O₃–MoO₃–B₂O₃ glass and low-density β′-Gd₂(MoO₄)₃ crystal: a study conducted using high-energy x-ray diffraction and EXAFS at high temperatures

Shinozaki

Tsuchiya

Honma

et al. 2019

J. Phys.: Condens. Matter

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In this study, the short-and medium-range ordering of 21.25Gd 2 O 3 -63.75MoO 3 -15B 2 O 3 glass (GM15B glass) was studied at temperatures ranging from 297 K to above the crystallization temperature. This was achieved using extended x-ray absorption fine structure and high-energy x-ray diffraction analyses to elucidate the structural origin of the higher glass density (d) as compared to that of precipitated crystals, i.e. GM15B glass with d = 4.762 g cm −3 and β′-Gd 2 (MoO 4 ) 3 crystal with d = 4.555 g cm −3 , and the self-powdering phenomenon in GM15B glass. The bond lengths in the short-range order, i.e. Gd-O, Mo-O, and Gd-Mo in GM15B, were extremely similar to those in the β-phase; Gd-Gd and Mo-Mo bonds in Gd-O-Gd and Mo-O-Mo, respectively, were not found. The distance between the Gd-Gd pairs in Gd-O-Mo-O-Gd in GM15B glass, r(Gd-Gd) = 6.19 Å, was considerably smaller than that in β-Gd 2 (MoO 4 ) 3 crystals (6.71 Å) in the crystallized glass at 808 K. This indicates that the glass had a more packed structure than did the precipitated crystals. The probable origin of the self-powdering phenomenon in GM15B glass was the large expansion of the structure during crystallization, which is due to the formation of an open structure with long Gd-Gd pairs and varying bond angles.

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“…Many inorganic molybdates with second harmonic generation (SHG) effect had been investigated and much progress had been achieved [11][12][13]. β′-Gd 2 (MoO 4 ) 3 crystal is one of them, which belongs to the orthorhombic system with space group Pba2 (no.…”

Section: Introductionmentioning

confidence: 99%

β′-Yb3+:Gd2(MoO4)3 crystal – A promising self-frequency doubling laser material

Sun

Zhang

et al. 2015

Optics Communications

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Magnetism of β′-Gd<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> and photoluminescence of β′-Eu<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> crystallized in rare-earth molybdenum borate glasses

Cited by 22 publications

References 24 publications

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

Structural origin of high-density Gd₂O₃–MoO₃–B₂O₃ glass and low-density β′-Gd₂(MoO₄)₃ crystal: a study conducted using high-energy x-ray diffraction and EXAFS at high temperatures

β′-Yb3+:Gd2(MoO4)3 crystal – A promising self-frequency doubling laser material

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Magnetism of β′-Gd<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> and photoluminescence of β′-Eu<sub>2</sub>(MoO<sub>4</sub>)<sub>3</sub> crystallized in rare-earth molybdenum borate glasses

Cited by 22 publications

References 24 publications

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]·H2O and Its Thermal Dehydration Product CsEu(SO4)2

Structural origin of high-density Gd2O3–MoO3–B2O3 glass and low-density β′-Gd2(MoO4)3 crystal: a study conducted using high-energy x-ray diffraction and EXAFS at high temperatures

β′-Yb3+:Gd2(MoO4)3 crystal – A promising self-frequency doubling laser material

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Structural origin of high-density Gd₂O₃–MoO₃–B₂O₃ glass and low-density β′-Gd₂(MoO₄)₃ crystal: a study conducted using high-energy x-ray diffraction and EXAFS at high temperatures