Improvement on microwave dielectric properties of Zn2GeO4 via gallium doping

Xing, Zhuo; Weng, Juhai; Ma, Ce

doi:10.1007/s10854-022-08063-6

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…Hexagonal rare-earth manganites, YMnO 3 ( h -YMnO 3 ) as a typical example of a multiferroic material, have attracted considerable interest owing to their promising physical properties and remarkable applications in spintronics and memory devices [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. h -YMnO 3 exhibits a ferroelectric transformation at T C ~900 K as well as an antiferromagnetic order below T N ~70 K. h -YMnO 3 crystal consists of MnO 5 trigonal bipyramids, separated by Y 3+ ions along the c -axis [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Modulation of the Structural, Magnetic, and Dielectric Properties of YMnO3 by Cu Doping

Wan,

Hua,

Guo

2024

Materials

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The lower valence compensation of YMn1-xCuxO3 (x = 0.00, 0.05, and 0.10) is prepared by the solid-state reaction, and the effects of divalent cation Cu-doping on the construction and magnetic and dielectric attributes of multiferroic YMnO3 are systemically researched. Powder X-ray diffraction shows YMn1-xCuxO3 has a single-phase hexagonal construction with a P63cm space group as the parent YMnO3, and lattice parameters decrease systematically as Cu concentration increases. Using the scanning electric microscope, structure morphologies analysis shows that the mean grain size varies between 1.90 and 2.20 μm as Cu content increases. YMn1-xCuxO3 magnetization increases as Cu doping concentration increases, and the antiferromagnetic transition temperature declines from 71 K for x = 0.00 to 58 K for x = 0.10. The valence distributions of Mn ions conduce to the modified magnetic attributes. Due to Cu substitution, the dielectric loss and dielectric constant decline as frequency increases from 400 to 700 K, showing representative relaxation behaviors. Indeed, that is a thermally activated process. In addition, the peak of the dielectric loss complies with the Arrhenius law. The relaxation correlates to the dipole effect regarding carrier hopping between Mn3+ and Mn4+, and also correlates to oxygen vacancies generated by Mn2+.

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Section: Introductionmentioning

confidence: 99%

Modulation of the Structural, Magnetic, and Dielectric Properties of YMnO3 by Cu Doping

Wan,

Hua,

Guo

2024

Materials

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Near‐Infrared Mechanoluminescence from Cr³⁺‐Doped Spinel Nanoparticles for Potential Oral Diseases Detection

Shao,

Chen,

Lun

et al. 2024

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Mechanoluminescence (ML) phosphors have found various promising utilizations such as in non‐destructive stress sensing, anti‐counterfeiting, and bio stress imaging. However, the reported NIR MLs have predominantly been limited to bulky particle size and weak ML intensity, hindering the further practical applications. For this regard, a nano‐sized ZnGa2O4: Cr3+ NIR ML phosphor is synthesized by hydrothermal method. By improving the synthesis method and regulating the chemical composition, the NIR ML (600–1000 nm) intensity of such nano‐materials has been further enhanced about four times. The reasons for the ML performance difference between micro‐/nano‐ sized phosphors also have been preliminarily analyzed. Additionally, this work probes into the ML mechanism deeply in traps’ aspect from band structure and defect formation energy, which can supply significant references for a new approach to develop efficient NIR ML nanoparticles. Finally, due to excellent tissue penetration capability, nano‐sized ZnGa2O4:Cr3+ NIR ML phosphor shows great potential applications in biomedical fields such as for the detection of clinical oral diseases.

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Optical anisotropy and refractive index dispersion of Zn₂GeO₄ microrods

Dolado,

Martínez-Casado,

Hidalgo

et al. 2023

Opt. Mater. Express

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Dielectric resonators with high light confinement offer low optical losses, which is essential for the development of high-performance optoelectronic devices. Among the different compounds, Zn2GeO4 has emerged as a promising wide band gap transparent conductive oxide with a low-dielectric constant. In order to control and optimize their optoelectronic properties, a good knowledge of their optical constants, such as the refractive index, is required. Here, we exploit the behaviour of Zn2GeO4 microrods as optical cavities to estimate experimentally for the first time, so far as we know, the refractive index dispersion of this compound. In addition, first principle calculations by density functional theory (DFT) of the dielectric function as a function of the light propagation direction have been performed, which have revealed a strong optical anisotropy. The results show that there is also an influence of native defects on the optical propagation properties. These physical aspects are crucial to tailor the optical features of Zn2GeO4 and exploit them in optoelectronic devices with bespoke properties.

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Improvement on microwave dielectric properties of Zn2GeO4 via gallium doping

Cited by 3 publications

References 27 publications

Modulation of the Structural, Magnetic, and Dielectric Properties of YMnO3 by Cu Doping

Modulation of the Structural, Magnetic, and Dielectric Properties of YMnO3 by Cu Doping

Near‐Infrared Mechanoluminescence from Cr³⁺‐Doped Spinel Nanoparticles for Potential Oral Diseases Detection

Optical anisotropy and refractive index dispersion of Zn₂GeO₄ microrods

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Improvement on microwave dielectric properties of Zn2GeO4 via gallium doping

Cited by 3 publications

References 27 publications

Modulation of the Structural, Magnetic, and Dielectric Properties of YMnO3 by Cu Doping

Modulation of the Structural, Magnetic, and Dielectric Properties of YMnO3 by Cu Doping

Near‐Infrared Mechanoluminescence from Cr3+‐Doped Spinel Nanoparticles for Potential Oral Diseases Detection

Optical anisotropy and refractive index dispersion of Zn2GeO4 microrods

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Near‐Infrared Mechanoluminescence from Cr³⁺‐Doped Spinel Nanoparticles for Potential Oral Diseases Detection

Optical anisotropy and refractive index dispersion of Zn₂GeO₄ microrods