Spectroscopic evidence for defect structure in irradiated PbWO4 single crystal

Li, Wensheng; Tang, Tong B.

doi:10.1016/s0960-8974(00)00005-x

Cited by 3 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 2θ = 27.45°, 29.71°, 32.80°, 44.84°, and 55.36°were indexed as the planes (112), (004), (200), (204), and (312) reflections of the tetragonal PbWO 4 , respectively. 40 It is notable that the characteristic peaks of paraffin and PbWO 4 are also reflected in the FTIR spectrum of the MEPCMs. Figure 3B shows the resulting FT-IR spectra of MEPCMs, paraffin, PbWO 4 .…”

Section: Chemical Composition and Crystallographymentioning

confidence: 95%

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

et al. 2019

View full text Add to dashboard Cite

Summary Novel microencapsulated phase change materials (MEPCMs) composed of the lead tungstate (PbWO4) shell and paraffin core were designed for shielding of gamma radiation as well as thermal energy storage. Such MEPCMs were prepared via self‐assembly methods and in‐situ precipitation. The PbWO4 shell with excellent photon attenuation can give the resulting MEPCMs an acceptable gamma radiation shielding capability. The chemical composition and structure of microcapsules samples were studied by X‐ray diffractometer (XRD) and Fourier‐transform infrared spectroscopy (FTIR). The effects of different core/shell mass ratios on the surface morphology and microstructure of the MEPCMs were determined by scanning electron microscopy (SEM), energy‐dispersive spectrometer (EDS), and transmission electronic microscopy (TEM). It was confirmed that the microcapsules exhibit a distinct core‐shell structure and a perfect spherical shape. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to present thermal stability and thermal‐storage capability of MEPCMs. A high‐purity germanium gamma spectrometer to measure the attenuation coefficient of the microcapsules for gamma rays showed that the MECPMs has good γ‐rays‐shielding property. The multifunction microcapsules in this study have great potential applications for building energy conservation as well as wearable personal protection in nuclear energy engineering.

show abstract

Section: Chemical Composition and Crystallographymentioning

confidence: 95%

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

et al. 2019

View full text Add to dashboard Cite

show abstract

Novel multifunctional microcapsule and its cyanate ester resin composites with self‐healing ability and gamma radiation shielding ability

Rui

Chen

Zhao

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

Resin-based composites used in spacecraft face risks from space debris and high-energy charged particles during their long-term service in the space environment. This work proposes a novel microcapsule (MC) and its cyanate ester (CE) resin-based composites (CE/MCs) with self-healing ability and gamma radiation shielding ability. The multifunctional epoxy/lead tungstate (EP@PWO) microcapsules are developed through self-assembly method and in-situ precipitation method. These microcapsules and curing agent 4,4 0diaminodiphenylsulfone (DDS) are incorporated into the CE resin to form resin-based composites with low curing temperature, self-healing ability, and

show abstract

Light-induced coloration and transformation process inPWO4crystals and the effects of the defect pairVPb
Zhang
¹
,
Liu
²
,
Chen
³

et al. 2003
Phys. Rev. B
37
0
1
0
View full text Add to dashboard Cite

The optical absorption spectrum of the as-grown PWO 4 crystal mainly exhibits a weak band peaking at 350 nm, overlapping with the absorption edge of the crystal. The ultraviolet-irradiated crystal emits a strong band peaking at 420 nm and a broad band in the range of 500-700 nm almost in pairs along with a decreasing of the 350-nm band. It is found that the 420-and 500-700-nm bands can be reduced, with a reirradiation of the 411-nm monochromatic light, while the 350-nm band is strengthened simultaneously. In this paper the mechanism is studied. It is demonstrated that the increasing and/or decreasing of both the 420-nm band and the 500-700-nm band are caused by the creation and/or the annihilation of V Pb 2Ϫ and V O 2ϩ , respectively. The creation and annihilation of V Pb 2Ϫ and V O 2ϩ are found to be related to the separation and recombination of the vacancy pair V Pb 2Ϫ ϪV O 2ϩ , which plays an important role in the formation and transformation process of light induced color centers in the PWO crystal.

show abstract

Spectroscopic evidence for defect structure in irradiated PbWO4 single crystal

Cited by 3 publications

References 4 publications

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

Novel multifunctional microcapsule and its cyanate ester resin composites with self‐healing ability and gamma radiation shielding ability

Light-induced coloration and transformation process inPWO4crystals and the effects of the defect pairVPb
Zhang
¹
,
Liu
²
,
Chen
³

et al. 2003
Phys. Rev. B
37
0
1
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Spectroscopic evidence for defect structure in irradiated PbWO4 single crystal

Cited by 3 publications

References 4 publications

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

Phase change microcapsules with lead tungstate shell for gamma radiation shielding and thermal energy storage

Novel multifunctional microcapsule and its cyanate ester resin composites with self‐healing ability and gamma radiation shielding ability

Light-induced coloration and transformation process inPWO4crystals and the effects of the defect pairVPbZhang1, Liu2, Chen3 et al. 2003Phys. Rev. B37010View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Light-induced coloration and transformation process inPWO4crystals and the effects of the defect pairVPb
Zhang
¹
,
Liu
²
,
Chen
³

et al. 2003
Phys. Rev. B
37
0
1
0
View full text Add to dashboard Cite