Microwave dielectric properties of low-fired Li2SnO3 ceramics co-doped with MgO–LiF

Fu, Zhifen; Liu, Peng; Ma, Jianli; Guo, Baochun; Chen, Xiao‐Ming; Zhang, Huaiwu

doi:10.1016/j.materresbull.2016.01.019

Cited by 25 publications

(13 citation statements)

References 27 publications

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“…With addition of 1/7 mol Mg contents, a secondary phase of Li 2 Mg 3 SnO 6 (JCPDS# 39‐0932) was detected accompanied by a reduction of Li 2 SnO 3 phase, and the intensity of (002) peak sharply decreased. This phenomena was in agreement with Keulen et al's report of Li/Sn/Mg catalysts and Fu et al's investigation of Li 2 SnO 3 co‐doped with MgO and LiF, which indicated the following chemical reaction happened:

\begin{matrix} {Li}_{2} Sn {normalO}_{3} false(monoclinic (C 2 / c) false) \\ + 3 MgO false(cubic (F m \bar{3} m) false) \to {Li}_{2} {Mg}_{3} {SnO}_{6} false(cubic 3 (F m \bar{3} m) false) \end{matrix}

XRD results demonstrated the existence of Li 2 Mg 3 SnO 6 by the presence of 2θ = 42.57° characteristic peak and will be further evidenced by refinement of XRD and EDX analysis later. Meanwhile, our XRD results were different to the Castellanos's study of phase diagram for the join Li 2 SnO 3 –MgO system where only Li 4 MgSn 2 O 7 or Li 2 SnO 3 existed in the range of 0 < x ≤ 1/7.…”

Section: Resultssupporting

confidence: 91%

“…It was noticeable that a weak vibration mode at around 643 cm −1 was detected at x = 1/7 for the first time. And the appearance of the new mode for XRD was correlated to the single Li/Sn/Mg–O vibration mode in Li 2 Mg 3 SnO 6 phase . Although the Li 4 MgSn 2 O 7 phase was observed in XRD pattern for x = 1/5 and 1/4, no special Raman peaks could be detected and some peaks at around 261 and 317 cm −1 even disappeared.…”

Section: Resultsmentioning

confidence: 92%

“…Figure displays the powder XRD patterns of the Li 2/3(1− x ) Sn 1/3(1− x ) Mg x O ceramic systems ( x = 0‐4/7) sintered in controlled atmosphere at optimal temperatures for 5 hours. For x = 0, all characteristic peaks were identified as pure Li 2 SnO 3 (JCPDS#31‐0761) phase with monoclinic rock salt structure in C 2/ c space group, and the strongest peak of (002) correlated with the long range ordering and preferred orientation of grain growth along the c axis was also observed . With addition of 1/7 mol Mg contents, a secondary phase of Li 2 Mg 3 SnO 6 (JCPDS# 39‐0932) was detected accompanied by a reduction of Li 2 SnO 3 phase, and the intensity of (002) peak sharply decreased.…”

Section: Resultsmentioning

confidence: 99%

“…In terms of Li 2 SnO 3 –MgO systems, however, there are just some fragmentary reports about their phase structure and microwave dielectric characteristics . For example, Castellanos et al revealed that Li 2 SnO 3 –MgO compound could form solid solution, and Li 4 MgSn 2 O 7 (L4MS2) could exist as an equilibrium phase .…”

Section: Introductionmentioning

confidence: 99%

“…For example, Castellanos et al revealed that Li 2 SnO 3 –MgO compound could form solid solution, and Li 4 MgSn 2 O 7 (L4MS2) could exist as an equilibrium phase . Fu et al reported the excellent microwave dielectric properties of Li 2 Mg 3 SnO 6 phase and claimed that Li 2 SnO 3 ceramics co‐doped with MgO–LiF could eventually form the Li 2 Mg 3 SnO 6 phase . Moreover, according to the solid solution theory, the cation sizes of Li 2 SnO 3 and MgO were very similar; the ionic radii of the cations were R (Mg 2+ ) = 0.72 Å and R [average (Li, Sn)] = 0.737 Å .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Structure and microwave dielectric properties of the Li_2/3(1−x)Sn_1/3(1−x)Mg_xO systems (x = 0‐4/7)

et al. 2017

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In this paper, the Li 2/3(1Àx) Sn 1/3(1Àx) Mg x O (LSMxO) ceramic systems were prepared by solid-state reaction using novel atmosphere-controlled sintering (x = 0-4/ 7). Pure Li 2 SnO 3 was observed for x = 0, the Li 2 Mg 3 SnO 6 and Li 2 SnO 3 coexisted for x = 1/7, and the coexistence of three kinds of phases was detected for x = 1/5 and 1/4, including Li 4 MgSn 2 O 7 impurity phase. Pure Li 2 Mg 3 SnO 6 -like phase with cubic rock salt structure in Fm-3m space group was obtained in the range of 1/3-4/7. All samples showed well-dense and smooth microstructures. The microwave dielectric properties highly depended on the phase composition, bond valence, FWHM of Raman spectrum, Raman shift, average grain sizes, and octahedral dis- | INTRODUCTIONMicrowave dielectric ceramics have played a paramount role as key components in the microwave devices ranging from any hand-held terminals to base stations due to the rapid growth in wireless communication industry.1 To meet the specific request of fifth-generation (5G) communication and applications, these ceramic systems are required to possess the adjustable dielectric constant (e r ), high quality factor (Q 9 f) and near-zero temperature coefficient of the resonant frequency (s f ). [2][3][4] Great efforts have been made to explore the new ceramic systems, and study the correlation between structure and microwave dielectric characteristics.In the past half-century, Li 2 BO 3 -MgO system (B = Ti, Sn), which is affiliated to the big family of rock salt structure phases, has drawn some attentions due to the phenomenon of order-disorder phase transition. In the case of Li 2 TiO 3 -MgO system, the substitution mechanism between Li/Ti and Mg has been confirmed by numerous literatures, [5][6][7][8][9][10][11][12][13] which could be expressed as 2Li. The substitution of Li/Ti for Mg leads to the ordered superstructure of Li 2 TiO 3 phase transforming from a monoclinic structure in C2/c space group to a disordered cubic structure in Fm-3m space group. Two phase systems, Li 2 TiO 3 (0 ≤ x < 1/5) and Li 2 Mg 3 TiO 6 (1/ 5 ≤ x ≤ 1/2) phase, were found according to the formula

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\begin{matrix} {Li}_{2} Sn {normalO}_{3} false(monoclinic (C 2 / c) false) \\ + 3 MgO false(cubic (F m \bar{3} m) false) \to {Li}_{2} {Mg}_{3} {SnO}_{6} false(cubic 3 (F m \bar{3} m) false) \end{matrix}

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structure and microwave dielectric properties of the Li_2/3(1−x)Sn_1/3(1−x)Mg_xO systems (x = 0‐4/7)

et al. 2017

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SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Liang

Fang

et al. 2018

Eur J Inorg Chem

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To develop reactive catalysts for oxidative coupling of methane at low temperatures, different alkali-metal oxides are adopted in this study to modify the surface of SnO 2 . In comparison with the unmodified SnO 2 , the reaction performance of all of the modified catalysts can be significantly improved, among which lithium oxide shows the best promotional effects, and the optimal catalyst is achieved with a Sn/Li molar ratio of 5:5. With this catalyst, the highest C 2 product yield of 16 % is achieved at 750°C. The XPS and CO 2 -TPD results reveal that for those catalysts with evident enhanced OCM reaction performance, the coexistence of a suitable amount of surface alkaline and electrophilic oxygen sites is indispensable. Furthermore, with the catalysts modified by different amounts of lithium oxide, the C 2 yield at different temperatures is nearly [a

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Sintering characteristics, microstructures and dielectric properties of borosilicate-based glass/alpha-Al2O3 composites for LTCC application with different MgO and Na2O contents

Liu

Zhou

et al. 2020

J Mater Sci: Mater Electron

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Microwave dielectric properties of low-fired Li2SnO3 ceramics co-doped with MgO–LiF

Cited by 25 publications

References 27 publications

Structure and microwave dielectric properties of the Li_2/3(1−x)Sn_1/3(1−x)Mg_xO systems (x = 0‐4/7)

Structure and microwave dielectric properties of the Li_2/3(1−x)Sn_1/3(1−x)Mg_xO systems (x = 0‐4/7)

SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Sintering characteristics, microstructures and dielectric properties of borosilicate-based glass/alpha-Al2O3 composites for LTCC application with different MgO and Na2O contents

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Microwave dielectric properties of low-fired Li2SnO3 ceramics co-doped with MgO–LiF

Cited by 25 publications

References 27 publications

Structure and microwave dielectric properties of the Li2/3(1−x)Sn1/3(1−x)MgxO systems (x = 0‐4/7)

Structure and microwave dielectric properties of the Li2/3(1−x)Sn1/3(1−x)MgxO systems (x = 0‐4/7)

SnO2Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides

Sintering characteristics, microstructures and dielectric properties of borosilicate-based glass/alpha-Al2O3 composites for LTCC application with different MgO and Na2O contents

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Product

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Structure and microwave dielectric properties of the Li_2/3(1−x)Sn_1/3(1−x)Mg_xO systems (x = 0‐4/7)

Structure and microwave dielectric properties of the Li_2/3(1−x)Sn_1/3(1−x)Mg_xO systems (x = 0‐4/7)

SnO₂Based Catalysts with Low‐Temperature Performance for Oxidative Coupling of Methane: Insight into the Promotional Effects of Alkali‐Metal Oxides