Synthesis of the HfGeO4:Ti4+ X-ray phosphor

Lambert, Patrick M.

doi:10.1016/s0025-5408(00)00217-8

Cited by 8 publications

(14 citation statements)

References 6 publications

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“…It is reported that MGeO 4 :Ti (M=Zr, and Hf) are good phosphors. 2,4 In order to study the effect of Ti addition on these compounds, we have calculated the electronic and optical properties of to the reduction in the band gap, moreover it is also found that HfO 2 :Ti is a good phosphor. In our present study we also observed the band gap to reduce with the addition of Ti.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…When doped with an impurity atom like Ti both ZrGeO 4 and HfGeO 4 are found to act as high density x-ray phosphors. 2,4 These germanates have also been used as solid state scintillators, 5 heterogeneous catalysts, 6 and laser-host materials. 7 The scientific research on the scheelite type compounds is mainly focused on the structural stability of the compounds under high pressure.…”

Section: Introductionmentioning

confidence: 99%

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High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO₄ and HfGeO₄ X-ray Phosphor Hosts

Shwetha

Kanchana

Babu³

et al. 2014

J. Phys. Chem. C

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Ab-initio calculations were performed on the scheelite type MGeO 4 (M = Hf, and Zr) compounds which find wide range of applications such as in x-ray imaging. We have studied the high pressure structural stability, elastic constants, electronic structure and optical properties of these compounds through density functional theory calculations. Two different density functional approaches namely plane wave pseudopotential method (PW-PP) and full potential linearized augmented plane wave method (FP-LAPW) were used for the present study. The ground state structural and vibrational properties are calculated and found to be in good agreement with experimental data. The compressibility of Zr and Hf germanates is found to be anisotropic as the a-axis is less compressible over c-axis due to the presence of Ge-O bonds along a-axis which is further confirmed from the ordering of the elastic constants that follows C 11 > C 33 . The electronic structure of the compounds has been calculated through recently developed Tran Blaha-modified Becke Johnson potential. The calculated electronic structure shows that the compounds are insulators with a gap of 5.39 eV for ZrGeO 4 and 6.25 eV for HfGeO 4 respectively. Optical anisotropy of these compounds are revealed from the computed optical properties such as complex dielectric function, refractive index, and absorption coefficient. In addition, it is observed that Ti doped ZrGeO 4 and HfGeO 4 turns out to be a good phosphor as the pristine compounds have the energy gap greater than the visible range upon Ti doping bandgap reduces as a result emission spectra occurs in the visible region and is well explained in the present study.

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Section: Optical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO₄ and HfGeO₄ X-ray Phosphor Hosts

Shwetha

Kanchana

Babu³

et al. 2014

J. Phys. Chem. C

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“…For this reason, germanium is now being reconsidered as a next‐generation material for electronic devices, while chemical characteristics and usage of germanium dioxide are gaining importance in design of advanced electronic devices . Germanium dioxide can take crystal structure of α‐quartz type or cristobalite type, while likely taking amorphous form; though it resembles silicon dioxide, a number of distinctions are known including water solubility and organic polymerization catalytic activity . Germanium dioxide is reported to be water soluble but the solubility value is estimated differently …”

Section: Forewordmentioning

confidence: 99%

“…4 Germanium dioxide can take crystal structure ofquartz type or cristobalite type, while likely taking amorphous form; though it resembles silicon dioxide, a number of distinctions are known including water solubility and organic polymerization catalytic activity. [5][6][7] Germanium dioxide is reported to be water soluble but the solubility value is estimated differently. [7][8][9][10] We prepared homogeneous aqueous solutions of multiple metal elements including germanium, and developed low-temperature processes to synthesize complex germanates from such solutions.…”

Section: Forewordmentioning

confidence: 99%

“…[5][6][7] Germanium dioxide is reported to be water soluble but the solubility value is estimated differently. [7][8][9][10] We prepared homogeneous aqueous solutions of multiple metal elements including germanium, and developed low-temperature processes to synthesize complex germanates from such solutions. [11][12][13][14] In the course of development, we discovered that germanium dioxide has abnormal water solubility characteristics.…”

Section: Forewordmentioning

confidence: 99%

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Growth of small GeO₂ single crystals on a polyvinyl chloride substrate at room temperature using oversaturate aqueous solution

Kobayashi

Suzuki

2019

Elect Comm in Japan

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Small GeO2 single crystal was successfully grown on a polyvinyl chloride (PVC) substrate at room temperature in oversaturate aqueous solution. The oversaturated solution could be prepared at strong acid condition (pH 0) using distilled water, germanium oxide, dilute ammonia, and nitric acid. About 7 μm size of the GeO2 single crystals with quartz‐type structure was obtained by only keeping the PVC plate in the solution for about 10 days when appropriate concentration of the solution was used. The obtained GeO2 single crystals were confirmed to be constructed by {101} and {011} surfaces based on powder X‐ray diffraction pattern and particle morphology observed by scanning electron microscope.

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Photoluminescence properties of zirconium and hafnium germanates obtained through different chemical routes

Лозанов

Prokip

Shayapov

et al. 2018

Ceramics International

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Synthesis of the HfGeO4:Ti4+ X-ray phosphor

Cited by 8 publications

References 6 publications

High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO₄ and HfGeO₄ X-ray Phosphor Hosts

High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO₄ and HfGeO₄ X-ray Phosphor Hosts

Growth of small GeO₂ single crystals on a polyvinyl chloride substrate at room temperature using oversaturate aqueous solution

Photoluminescence properties of zirconium and hafnium germanates obtained through different chemical routes

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Synthesis of the HfGeO4:Ti4+ X-ray phosphor

Cited by 8 publications

References 6 publications

High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO4 and HfGeO4 X-ray Phosphor Hosts

High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO4 and HfGeO4 X-ray Phosphor Hosts

Growth of small GeO2 single crystals on a polyvinyl chloride substrate at room temperature using oversaturate aqueous solution

Photoluminescence properties of zirconium and hafnium germanates obtained through different chemical routes

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Resources

About

High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO₄ and HfGeO₄ X-ray Phosphor Hosts

High-Pressure Structural Stability and Optical Properties of Scheelite-type ZrGeO₄ and HfGeO₄ X-ray Phosphor Hosts

Growth of small GeO₂ single crystals on a polyvinyl chloride substrate at room temperature using oversaturate aqueous solution