Influence of titanium doping on the Raman spectra of nanocrystalline ZnAl2O4

Mohaček-Grošev, Vlasta; Vrankić, Martina; Maksimović, Aleksandar; Mandić, Vilko

doi:10.1016/j.jallcom.2016.12.116

Cited by 30 publications

(17 citation statements)

References 38 publications

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“…In this work, Raman spectrum analysis was applied to analyze the effect of [Zn 0.5 Ti 0.5 ] 3+ concentration of the ZnAl 2‐ x (Zn 0.5 Ti 0.5 ) x O 4 ceramics on intrinsic dielectric properties. The group theory suggests 42 spatial degrees of freedom that can span the following irreducible representations:

Γ = A_{1 g} (R) + E_{g} (R) + T_{1 g} + 3 T_{2 g} (R) + 2 A_{2 u} + 2 E_{u} + 5 T_{1 u} (IR) + 2 T_{2 u},

where R and IR represent Raman‐active and infrared‐active vibrational modes, respectively. The other are silent modes.…”

Section: Resultsmentioning

confidence: 99%

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Improved sinterability and microwave dielectric properties of [Zn_0.5Ti_0.5]³⁺‐doped ZnAl₂O₄ spinel solid solution

Lan

Zou

et al. 2019

J Am Ceram Soc

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Low‐permittivity ZnAl2‐x(Zn0.5Ti0.5)xO4 ceramics were synthesized via conventional solid‐state reaction method. A pure ZnAl2O4 solid‐state solution with an Fd‐3m space group was achieved at x ≤ 0.1. Results showed that partial substitution of [Zn0.5Ti0.5]3+ for Al3+ effectively lowered the sintering temperature of the ZnAl2O4 ceramics and remarkably increased the quality factor (Q × f) values. Optimum microwave dielectric properties (εr = 9.1, Q × f = 115,800 GHz and τf = −78 ppm/°C) were obtained in the sample with x = 0.1 sintered at 1400°C in oxygen atmosphere for 10 h. The temperature used for the sample was approximately 250°C lower than the sintering temperature of conventional ZnAl2O4 ceramics.

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Γ = A_{1 g} (R) + E_{g} (R) + T_{1 g} + 3 T_{2 g} (R) + 2 A_{2 u} + 2 E_{u} + 5 T_{1 u} (IR) + 2 T_{2 u},

where R and IR represent Raman‐active and infrared‐active vibrational modes, respectively. The other are silent modes.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, Raman spectrum analysis was applied to analyze the effect of [Zn 0.5 Ti 0.5 ] 3+ concentration of the ZnAl 2-x (Zn 0.5 Ti 0.5 ) x O 4 ceramics on intrinsic dielectric properties. The group theory suggests 42 spatial degrees of freedom that can span the following irreducible representations [21][22][23] :…”

Section: Resultsmentioning

confidence: 99%

Improved sinterability and microwave dielectric properties of [Zn_0.5Ti_0.5]³⁺‐doped ZnAl₂O₄ spinel solid solution

Lan

Zou

et al. 2019

J Am Ceram Soc

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“…It is generally accepted that Raman modes within the medium frequency range (300-600 cm -1 ) modes are due to the MO6 octahedral while the high range frequency (> 600 cm -1 ) modes are due to the MO4 tetrahedral. Thus, the 420 and 660 cm -1 bands can be attributed to the Eg and F2g mode ascribed to the Oh and Td site [20,21], respectively. These observed two peaks from ZnAl2O4 is in good agreement with the previous reports [16,17,20,21].…”

Section: Raman Spectroscopymentioning

confidence: 97%

“…Thus, the 420 and 660 cm -1 bands can be attributed to the Eg and F2g mode ascribed to the Oh and Td site [20,21], respectively. These observed two peaks from ZnAl2O4 is in good agreement with the previous reports [16,17,20,21]. Previous studies [16,44] have shown that Eg and F2g modes of Raman spectrum of the inverse spinel occurred in the 350 -400 and 490 -640 cm -1 region.…”

Section: Raman Spectroscopymentioning

confidence: 97%

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Effects of Varying Alx Moles on the Structure and Luminescence Properties of ZnAlxO1.5x + 1:0.1% Tb3+ Nano Phosphor Prepared using Citrate sol-gel Method

Maphiri

Melato

Mhlongo

et al. 2021

Preprint

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Un-doped and ZnAlxO(1.5x + 1):0.1% Tb3+ (ZAOT) nano-powders were synthesized via citrate sol-gel method. The Alx moles were varied in the range of 0.25 ≤ x ≤ 5.0. The X-ray powder diffraction (XRD) data revealed that for the x < 1.5, the prepared samples crystal structure consists of mixed phases of the cubic ZnAl2O4 and hexagonal ZnO phases, while for the x ≥ 1.5 the structure consists of single phase of cubic ZnAl2O4. This was confirmed by the Raman and Fourier-Transform Infrared (FTIR) vibrational spectroscopy. Scanning electron microscopy (SEM) showed that varying Alx moles influences the morphology while Transmission electron microscopy (TEM) shows the dual morphology at x < 1.5. The photoluminescence (PL) revealed intense and distinct emissions attributed to both the host and Tb3+ transitions. The emission intensity highly depends on the Alx moles. The International Commission on Illumination (CIE) colour chromaticity showed that the emission colour could be tuned by varying the Alx moles.

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Performance Evaluation of Prototype Microstrip Patch Antenna Fabrication Using Microwave Dielectric Ceramic Nanocomposite Materials for X‐Band Applications

Siragam

2024

Integrated Devices for Artificial Intelligence and VLSI

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Influence of titanium doping on the Raman spectra of nanocrystalline ZnAl2O4

Cited by 30 publications

References 38 publications

Improved sinterability and microwave dielectric properties of [Zn_0.5Ti_0.5]³⁺‐doped ZnAl₂O₄ spinel solid solution

Improved sinterability and microwave dielectric properties of [Zn_0.5Ti_0.5]³⁺‐doped ZnAl₂O₄ spinel solid solution

Effects of Varying Alx Moles on the Structure and Luminescence Properties of ZnAlxO1.5x + 1:0.1% Tb3+ Nano Phosphor Prepared using Citrate sol-gel Method

Performance Evaluation of Prototype Microstrip Patch Antenna Fabrication Using Microwave Dielectric Ceramic Nanocomposite Materials for X‐Band Applications

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Influence of titanium doping on the Raman spectra of nanocrystalline ZnAl2O4

Cited by 30 publications

References 38 publications

Improved sinterability and microwave dielectric properties of [Zn0.5Ti0.5]3+‐doped ZnAl2O4 spinel solid solution

Improved sinterability and microwave dielectric properties of [Zn0.5Ti0.5]3+‐doped ZnAl2O4 spinel solid solution

Effects of Varying Alx Moles on the Structure and Luminescence Properties of ZnAlxO1.5x + 1:0.1% Tb3+ Nano Phosphor Prepared using Citrate sol-gel Method

Performance Evaluation of Prototype Microstrip Patch Antenna Fabrication Using Microwave Dielectric Ceramic Nanocomposite Materials for X‐Band Applications

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Improved sinterability and microwave dielectric properties of [Zn_0.5Ti_0.5]³⁺‐doped ZnAl₂O₄ spinel solid solution

Improved sinterability and microwave dielectric properties of [Zn_0.5Ti_0.5]³⁺‐doped ZnAl₂O₄ spinel solid solution