{"title":"超低烧结温度Na5Tm1 - x(Y1/3Yb2/3)x(MoO4)4陶瓷的拉曼光谱和微波介电性能","authors":"Yuan-Bin Chen, Siyi Xiong","doi":"10.1038/s41598-025-91117-6","DOIUrl":null,"url":null,"abstract":"<p><p>The Na<sub>5</sub>Tm<sub>1 - x</sub>(Y<sub>1/3</sub>Yb<sub>2/3</sub>)<sub>x</sub>(MoO<sub>4</sub>)<sub>4</sub> ceramics (x=0-0.18) were successfully synthesized via the solid-state reaction method. XRD analysis revealed that they possessed a single-phase tetragonal scheelite structure belonging to the space group I4₁/a(88). SEM analysis demonstrated that the samples sintered at 600 °C exhibited a dense microstructure, with a relative density as high as 94.9% and an average grain size ranging from 2.172 μm to 2.424 μm. The relative density serves as an external factor influencing ε<sub>r</sub> and Q×f, while τ<sub>f</sub> is related to bond valence. The ionicity of the Tm-O bond, and the lattice energy and bond energy of the Mo-O bond are the intrinsic factors determining ε<sub>r</sub>, Q×f, and τ<sub>f</sub>, respectively. Raman spectroscopy provided an intuitive characterization of the vibrational properties of the [MoO<sub>4</sub>]<sup>2-</sup> tetrahedra within the ceramics. Although the pure phase Na₅Tm(MoO<sub>4</sub>)<sub>4</sub> ceramic exhibited optimal dielectric properties (ε<sub>r</sub>=8.025, Q×f=18,967 GHz, and τ<sub>f</sub> = -101 ppm/°C) at 625 °C, the Na<sub>5</sub>Tm<sub>0.91</sub>Y<sub>0.03</sub>Yb<sub>0.06</sub>(MoO<sub>4</sub>)<sub>4</sub> ceramic sintered at 600 °C demonstrated superior dielectric properties (ε<sub>r</sub>=7.82, Q×f=34,752 GHz, and τ<sub>f</sub> = -71.9 ppm/°C).</p>","PeriodicalId":21811,"journal":{"name":"Scientific Reports","volume":"15 1","pages":"6644"},"PeriodicalIF":3.9000,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11850803/pdf/","citationCount":"0","resultStr":"{\"title\":\"Raman spectra and microwave dielectric properties of Na<sub>5</sub>Tm<sub>1 - x</sub>(Y<sub>1/3</sub>Yb<sub>2/3</sub>)<sub>x</sub>(MoO<sub>4</sub>)<sub>4</sub> ceramics with ultra-low sintering temperature.\",\"authors\":\"Yuan-Bin Chen, Siyi Xiong\",\"doi\":\"10.1038/s41598-025-91117-6\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>The Na<sub>5</sub>Tm<sub>1 - x</sub>(Y<sub>1/3</sub>Yb<sub>2/3</sub>)<sub>x</sub>(MoO<sub>4</sub>)<sub>4</sub> ceramics (x=0-0.18) were successfully synthesized via the solid-state reaction method. XRD analysis revealed that they possessed a single-phase tetragonal scheelite structure belonging to the space group I4₁/a(88). SEM analysis demonstrated that the samples sintered at 600 °C exhibited a dense microstructure, with a relative density as high as 94.9% and an average grain size ranging from 2.172 μm to 2.424 μm. The relative density serves as an external factor influencing ε<sub>r</sub> and Q×f, while τ<sub>f</sub> is related to bond valence. The ionicity of the Tm-O bond, and the lattice energy and bond energy of the Mo-O bond are the intrinsic factors determining ε<sub>r</sub>, Q×f, and τ<sub>f</sub>, respectively. Raman spectroscopy provided an intuitive characterization of the vibrational properties of the [MoO<sub>4</sub>]<sup>2-</sup> tetrahedra within the ceramics. Although the pure phase Na₅Tm(MoO<sub>4</sub>)<sub>4</sub> ceramic exhibited optimal dielectric properties (ε<sub>r</sub>=8.025, Q×f=18,967 GHz, and τ<sub>f</sub> = -101 ppm/°C) at 625 °C, the Na<sub>5</sub>Tm<sub>0.91</sub>Y<sub>0.03</sub>Yb<sub>0.06</sub>(MoO<sub>4</sub>)<sub>4</sub> ceramic sintered at 600 °C demonstrated superior dielectric properties (ε<sub>r</sub>=7.82, Q×f=34,752 GHz, and τ<sub>f</sub> = -71.9 ppm/°C).</p>\",\"PeriodicalId\":21811,\"journal\":{\"name\":\"Scientific Reports\",\"volume\":\"15 1\",\"pages\":\"6644\"},\"PeriodicalIF\":3.9000,\"publicationDate\":\"2025-02-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11850803/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Scientific Reports\",\"FirstCategoryId\":\"103\",\"ListUrlMain\":\"https://doi.org/10.1038/s41598-025-91117-6\",\"RegionNum\":2,\"RegionCategory\":\"综合性期刊\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MULTIDISCIPLINARY SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Scientific Reports","FirstCategoryId":"103","ListUrlMain":"https://doi.org/10.1038/s41598-025-91117-6","RegionNum":2,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MULTIDISCIPLINARY SCIENCES","Score":null,"Total":0}
Raman spectra and microwave dielectric properties of Na5Tm1 - x(Y1/3Yb2/3)x(MoO4)4 ceramics with ultra-low sintering temperature.
The Na5Tm1 - x(Y1/3Yb2/3)x(MoO4)4 ceramics (x=0-0.18) were successfully synthesized via the solid-state reaction method. XRD analysis revealed that they possessed a single-phase tetragonal scheelite structure belonging to the space group I4₁/a(88). SEM analysis demonstrated that the samples sintered at 600 °C exhibited a dense microstructure, with a relative density as high as 94.9% and an average grain size ranging from 2.172 μm to 2.424 μm. The relative density serves as an external factor influencing εr and Q×f, while τf is related to bond valence. The ionicity of the Tm-O bond, and the lattice energy and bond energy of the Mo-O bond are the intrinsic factors determining εr, Q×f, and τf, respectively. Raman spectroscopy provided an intuitive characterization of the vibrational properties of the [MoO4]2- tetrahedra within the ceramics. Although the pure phase Na₅Tm(MoO4)4 ceramic exhibited optimal dielectric properties (εr=8.025, Q×f=18,967 GHz, and τf = -101 ppm/°C) at 625 °C, the Na5Tm0.91Y0.03Yb0.06(MoO4)4 ceramic sintered at 600 °C demonstrated superior dielectric properties (εr=7.82, Q×f=34,752 GHz, and τf = -71.9 ppm/°C).
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