Effects of (KMg)3+ co-doping and sintering temperature on the negative thermal expansion property of Sc2W3O12 ceramics

Liu, Hongfei; Fan, Xiaoxue; Wang, Wei; Zeng, Xianghua; Zhang, Zhiping

doi:10.1016/j.ceramint.2024.03.230

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…In addition, W 6+ is coordinated with five O atoms to form a [WO 5 ] polyhedron. Like other compounds in the A 2 M 3 O 12 family, the [EuO 8 ] dodecahedron and the [MoO 4 ]/[WO 4 ] tetrahedron are connected by common O atoms, , and [EuO 8 ] polyhedra connect with each other by edge sharing. The above results indicate that the solid-solution phase can be easily formed without significant crystal structure changes by adjusting the atomic ratio of W 6+ to Mo 6+ .…”

Section: Resultsmentioning

confidence: 99%

“…Eu 2 W 3 O 12 (EWO) and Eu 2 Mo 3 O 12 (EMO) are isomorphic crystal structures that belong to a centric C-centered monoclinic phase with space group C12/c 1. 27,28 In Figure 1a, both compounds comprise one Eu 3+ site, two W 6+ /Mo 6+ sites, and six O 29,30 and [EuO 8 ] polyhedra connect with each other by edge sharing. The above results indicate that the solid-solution phase can be easily formed without significant crystal structure changes by adjusting the atomic ratio of W 6+ to Mo 6+ .…”

Section: Crystal Structure and Phase Identificationmentioning

confidence: 99%

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Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu₂W_3–xMo_xO₁₂ Solid-Solution Phosphors

Sun,

Wang,

Liao

et al. 2024

ACS Appl. Opt. Mater.

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Superior thermal stability is an essential property of phosphor materials for their practical applications in the whitelight-emitting diode (pc-WLED) lighting area. Nevertheless, the development of thermally stable red phosphor remains a challenging issue due to the serious nonradiative transition loss. In this work, a series of red-emitting Eu 2 W 3−x Mo x O 12 (0.0 ≤ x ≤ 3.0) solid-solution phosphors were synthesized based on hightemperature solid-phase reaction. Surprisingly, the thermal stability property is obviously improved by designing a cationic substitution strategy and adjusting the annealing temperature. Under nearultraviolet light excitation (395 nm), the emission intensity of Eu 2 W 3 O 12 and Eu 2 Mo 3 O 12 at 125 °C is 0.63 and 1.36 times of that at 25 °C, respectively. The emission intensity of Eu 2 Mo 3 O 12 at 125 °C is increased to 2.16, which exhibits more competitive thermal stability than Eu 2 W 3 O 12 . This unique antithermal quenching enhancement phenomenon is ascribed to the decreased thermal ionization and thermally activated crossover effect energy, resulting from the simultaneously increased optical band gap and activation energy via the cationic substitution strategy. This work proposes a strategy to optimize the thermal stability behavior of red phosphors in pc-WLED applications.

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Section: Resultsmentioning

confidence: 99%

Section: Crystal Structure and Phase Identificationmentioning

confidence: 99%

Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu₂W_3–xMo_xO₁₂ Solid-Solution Phosphors

Sun,

Wang,

Liao

et al. 2024

ACS Appl. Opt. Mater.

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Synthesis, structure, and thermal expansion in CaZrF6 with two polymorphs

Zhang,

Qiao,

Zhao

et al. 2024

Nano Res.

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Synthesis and negative thermal expansion performance of (NaMg)³⁺ codoped Sc₂W₃O₁₂ ceramics

Fan,

Zhang,

Liu

2024

J Am Ceram Soc.

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A series of NaxMgxSc2 − xW3O12 (0 ≤ x ≤ 0.75) ceramics has been prepared by the coprecipitation process. The phase composition, crystal structure, morphology, and thermal expansion behavior of NaxMgxSc2 − xW3O12 samples were investigated. The results show that (NaMg)3+ substitution causes a phase transition in NaxMgxSc2 − xW3O12. For 0 < x ≤ 0.25, both orthorhombic Sc2W3O12 and hexagonal NaxMgxSc2 − xW3O12 coexist in the sample. For 0.25 < x ≤ 0.75, (NaMg)3+ double cations successfully replace Sc3+, and single‐phase hexagonal NaxMgxSc2 − xW3O12 ceramics were prepared. For x = 1, the impurity MgWO4 was detected. As the (NaMg)3+ codoping amount increases, the grain size grew up and the density of the NaxMgxSc2 − xW3O12 ceramics increased. The coefficients of thermal expansion (CTE) of negative thermal expansion (NTE) NaxMgxSc2 − xW3O12 (0 ≤ x ≤ 0.75) ceramics were improved from −6.02 × 10−6°C−1 to −15.19 × 10−6°C−1 in 30–700°C. Moreover, as the sintering temperature increased, the CTEs of Na0.75Mg0.75Sc1.25W3O12 ceramics were improved from −10.36 × 10−6°C−1 to −13.64 × 10−6°C−1.

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Effects of (KMg)3+ co-doping and sintering temperature on the negative thermal expansion property of Sc2W3O12 ceramics

Cited by 3 publications

References 28 publications

Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu₂W_3–xMo_xO₁₂ Solid-Solution Phosphors

Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu₂W_3–xMo_xO₁₂ Solid-Solution Phosphors

Synthesis, structure, and thermal expansion in CaZrF6 with two polymorphs

Synthesis and negative thermal expansion performance of (NaMg)³⁺ codoped Sc₂W₃O₁₂ ceramics

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Effects of (KMg)3+ co-doping and sintering temperature on the negative thermal expansion property of Sc2W3O12 ceramics

Cited by 3 publications

References 28 publications

Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu2W3–xMoxO12 Solid-Solution Phosphors

Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu2W3–xMoxO12 Solid-Solution Phosphors

Synthesis, structure, and thermal expansion in CaZrF6 with two polymorphs

Synthesis and negative thermal expansion performance of (NaMg)3+ codoped Sc2W3O12 ceramics

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Product

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Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu₂W_3–xMo_xO₁₂ Solid-Solution Phosphors

Thermal Stability Enhancement by a Cationic Substitution Strategy in Red-Emitting Eu₂W_3–xMo_xO₁₂ Solid-Solution Phosphors

Synthesis and negative thermal expansion performance of (NaMg)³⁺ codoped Sc₂W₃O₁₂ ceramics