Nanostructured YAG and Er:YAG Powders Synthesized via Glycine–Nitrate Technique for Optically Transparent Ceramics

Nano-sized cerium-doped lutetium aluminum garnet (LuAG:Ce) powders were prepared via a sol-gel combustion process from a mixed solution of metal nitrates, using organic glycine as a fuel. The purified crystalline phase of LuAG:Ce was obtained after calcination at 1000 °C for 2 h. The obtained phosphors were agglomerated and had a foamy-like morphology, consisting of pointed crystallites with uniform size of about 40 nm. Both the photoluminescence and the radioluminescence of the calcined powders showed the same two emission bands, corresponding to transitions from the lowest 5d excited state (2D) to the 4f ground state of Ce3+ (2F5/2, 2F7/2). Using the prepared powders, polycrystalline LuAG:Ce optically transparent ceramics were successfully fabricated at 1850 °C for 10 h under vacuum without sintering aids and annealed at 1450 °C for 20 h in air. The sintered ceramics are transparent with an in-line light transmittance in the visible wavelength range of about 50% and have a uniform microstructure with an average grain size of about 8 μm. The radioluminescence of the transparent ceramics is similar to that for calcined powders, except higher in intensity.

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Optically transparent ceramics based on yttrium oxide using carbonate and alkoxy precursors

Glass and Ceramics ◽

10.1007/s10717-006-0094-9 ◽

2006 ◽

Vol 63 (7-8) ◽

pp. 262-264 ◽

Cited By ~ 8

Author(s):

A. V. Belyakov ◽

D. O. Lemeshev ◽

E. S. Lukin ◽

G. P. Val’nin ◽

E. E. Grinberg

Keyword(s):

Yttrium Oxide ◽

Transparent Ceramics ◽

Optically Transparent ◽

Optically Transparent Ceramics

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High piezoelectricity of Eu3+-doped Pb(Mg1/3Nb2/3)O3–0.25PbTiO3 transparent ceramics

Journal of Materials Chemistry C ◽

10.1039/d0tc05351a ◽

2021 ◽

Author(s):

Kai Li ◽

Enwei Sun ◽

Yongcheng Zhang ◽

Zhenzhen Song ◽

Xudong Qi ◽

...

Keyword(s):

Relaxor Ferroelectric ◽

Oxygen Atmosphere ◽

Ferroelectric Ceramics ◽

Transparent Ceramics ◽

Hot Press ◽

Optically Transparent ◽

Hot Press Sintering ◽

Relaxor Ferroelectric Ceramics

Optically transparent Eu3+-doped Pb(Mg1/3Nb2/3)O3–0.25PbTiO3 (PMN–0.25PT:Eu3+) relaxor ferroelectric ceramics with high piezoelectricity were prepared by oxygen-atmosphere sintering followed by hot-press sintering.

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Dislocations, Ordering and Antiferromagnetic Domains in MnO

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069600 ◽

1970 ◽

Vol 28 ◽

pp. 522-523

Author(s):

D. J. Barber ◽

R. G. Evans

Keyword(s):

Electron Diffraction ◽

Single Crystal ◽

Optical Microscopy ◽

Defect Chemistry ◽

Magnetic Structures ◽

Optically Transparent ◽

Magnetic Features ◽

Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

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