Up-conversion luminescence from single vanadate through blackbody radiation harvesting broadband near-infrared photons for photovoltaic cells

Ce 2 [Zr 1-x (Mg 1/3 Sb 2/3 ) x ] 3 (MoO 4 ) 9 (0.02≤x≤0.10) ceramics were prepared well through the traditional solid-state method. A single phase, belonging to the space group of R-3c, was detected by using X-ray diffraction at sintering temperatures ranging from 700 to 850 °C. The crystallization micro-structural of specimens was examined by applying Scanning electron microscopy. The structural refinement of these samples was investigated in detail by performing the Rietveld refinement method. The intrinsic properties were calculated and explored via far-infrared reflectivity spectroscopy. The correlations between the chemical bonds parameters and microwave dielectric properties were calculated and analyzed by P-V-L theory. Ce 2 [Zr 0.94 (Mg 1/3 Sb 2/3 ) 0.06 ] 3 (MoO 4 ) 9 ceramics with excellent dielectric properties: ε r = 10.37, Q×f = 71748 GHz and τ f = −13.6 ppm/°C sintered at 725 °C for 6 hours.

show abstract

“…(24)) and the Fresnel formula (Eq. ( 25)) [29,30]. The dielectric loss tangent tanδ is evaluated by Eq.…”

Section: Resultsmentioning

confidence: 99%

Effects of (Mg1/3Sb2/3)4+ substitution on the structure and microwave dielectric properties of Ce2Zr3(Mg1/3Sb2/3)3-3(MoO4)9 ceramics

Wang

Liu

Sun

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…It can be seen that the infrared spectra can be well fitted by 6 resonant modes, and the related phonon parameters are listed in Table 1. These spectra were analysed by using the classical harmonic oscillator model based on the standard Lorentzian formula [Eq (6)] and the Fresnel formula [Eq (7)] [42,43]. * ( )…”

Section: Resultsmentioning

confidence: 99%

Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic

Zhang

Fang

Xiang

et al. 2019

Ceramics International

View full text Add to dashboard Cite

A cubic rock salt structured ceramic, Li7Ti3O9F, was fabricated via the conventional solid-state reaction route. The synthesis conditions, sintering characteristics, and microwave dielectric properties of Li7Ti3O9F ceramics were investigated by X-ray diffraction (XRD), thermal dilatometer, Scanning Electron Microscopy (SEM) accompanied with EDS mapping, and microwave resonant measurements. Rietveld refinement, selected area electron diffraction (SAED) pattern and high-resolution transmission electron microscopy (HRTEM) confirmed that Li7Ti3O9F adopts a cubic rock-salt structure. The ceramic sintered at 950 °C presented the optimal microwave properties of εr = 22.5, Q×f = 88,200 GHz, and τf=−24.2 ppm/°C. Moreover, good chemical compatibility with Ag was verified through cofiring at 950 °C for 2 h. These results confirm a large potential for Li7Ti3O9F ceramic to be utilized as substrates in the low temperature cofired ceramic (LTCC) technology. This work provides the possibility to exploit low-temperature-firing ceramics through solid solution between oxides and fluorides.

show abstract

“…The measured spectrum was similar to that of the ZrTiO 4 . These spectra were analyzed, using the classical harmonic oscillator model based on the standard Lorentzian formula [Equation ] and the Fresnel formula [Equation ]:

{normalε}^{*} false(normalω false) = {normalε}_{\infty} + {false\sum}_{j = 1}^{n} \frac{ω_{p j}^{2}}{{normalω}_{o j}^{2} - {normalω}^{2} - i {normalγ}_{j} ω}

R (ω) = {|\frac{1 - \sqrt{ε^{*} (ω)}}{1 + \sqrt{ε^{*} (ω)}}|}^{2},

…”

Section: Resultsmentioning

confidence: 99%

Section: Addition the Variation Inmentioning

confidence: 99%

High quality factor microwave dielectric ceramics in the (Mg_1/3Nb_2/3)O₂–ZrO₂–TiO₂ ternary system

Zhou

Pang

et al. 2017

J Am Ceram Soc

View full text Add to dashboard Cite

Novel high quality factor microwave dielectric ceramics (1−x)ZrTiO4−x(Mg1/3Nb2/3)TiO4 (0.325≤x≤0.4) and (ZrTi)1−y(Mg1/3Nb2/3)yO4 (0.2≤y≤0.5) with the addition of 0.5 wt% MnCO3 in the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system were prepared, using solid‐state reaction method. The relationship between the structure and microwave dielectric properties of the ceramics was studied. The XRD patterns of the sintered samples reveal the main phase belonged to α‐PbO2‐type structure. Raman spectroscopy and infrared reflectivity (IR) spectra were employed to evaluate phonon modes of ceramics. The 0.65ZrTiO4−0.35(Mg1/3Nb2/3)TiO4−0.5 wt% MnCO3 ceramic can be well densified at 1240°C for 2 hours and exhibits good microwave dielectric properties with a relative permittivity (εr) of 42.5, a quality factor (Q×f) value of 43 520 GHz (at 5.9 Ghz) and temperature coefficient of resonant frequency (τf) value of −5ppm/°C. Furthermore, the (ZrTi)0.7(Mg1/3Nb2/3)0.3O4−0.5 wt% MnCO3 ceramic sintered at 1260°C for 2 hours possesses a εr of 31.8, a Q×f value of 35 640 GHz (at 6.3 GHz) and a near zero τf value of −5.9 ppm/°C. The results demonstrated that the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system with excellent properties was a promising material for microwave electronic device applications.

show abstract

Up-conversion luminescence from single vanadate through blackbody radiation harvesting broadband near-infrared photons for photovoltaic cells

Cited by 35 publications

References 45 publications

Effects of (Mg1/3Sb2/3)4+ substitution on the structure and microwave dielectric properties of Ce2Zr3(Mg1/3Sb2/3)3-3(MoO4)9 ceramics

Effects of (Mg1/3Sb2/3)4+ substitution on the structure and microwave dielectric properties of Ce2Zr3(Mg1/3Sb2/3)3-3(MoO4)9 ceramics

Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic

High quality factor microwave dielectric ceramics in the (Mg_1/3Nb_2/3)O₂–ZrO₂–TiO₂ ternary system

Contact Info

Product

Resources

About

Up-conversion luminescence from single vanadate through blackbody radiation harvesting broadband near-infrared photons for photovoltaic cells

Cited by 35 publications

References 45 publications

Effects of (Mg1/3Sb2/3)4+ substitution on the structure and microwave dielectric properties of Ce2Zr3(Mg1/3Sb2/3)3-3(MoO4)9 ceramics

Effects of (Mg1/3Sb2/3)4+ substitution on the structure and microwave dielectric properties of Ce2Zr3(Mg1/3Sb2/3)3-3(MoO4)9 ceramics

Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic

High quality factor microwave dielectric ceramics in the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system

Contact Info

Product

Resources

About

High quality factor microwave dielectric ceramics in the (Mg_1/3Nb_2/3)O₂–ZrO₂–TiO₂ ternary system