Rare-earth-free luminescent non-stoichiometric phases formed in SrO–HfO2 ternary compositions

Boháček, P.; Trunda, Bohumil; Beitlerová, A.; Drahokoupil, Jan; Jarý, V.; Studnička, V.; Nikl, M.

doi:10.1016/j.jallcom.2013.06.150

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…26 However, there has been very little work on the synthesis of SrHfO 3 NPs, partly because of the high temperature required. SrHfO 3 requires prolonged calcination at 1100-1200 C for several hours, 27 oen along with inter-mediate grinding 28 to form in solid-state reactions, with large consequential grain growth, and requires even higher temperatures of 1600-1750 C to be sintered. 29 Even in thin lm form, it needs to be annealed at 650-800 C to become crystalline.…”

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confidence: 99%

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO₃ perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

et al. 2016

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confidence: 99%

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO₃ perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

et al. 2016

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“…However, the attractiveness of intentionally nonstoichiometric compounds of the general formula A

_{i}

_{2 - i}

_{4 - i}

, where i

<

1 for scintillator and X‐ray phosphor applications has strongly increased recently. Namely, stable compositions for

i \approx 0.9

were found with very intense near‐UV luminescence of deeply submicrosecond decay time and thermal stability up to 400 K at least . Even more interesting, Sr

_{0.9}

_{1.1}

_{3.1}

shows rather negligible afterglow even in units‐of‐microsecond time scale (), which makes it very interesting candidate for superfast imaging applications ().…”

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confidence: 99%

Intrinsic defects, nonstoichiometry, and aliovalent doping of ABO perovskite scintillators

Casillas-Trujillo

Andersson

Dorado

et al. 2014

Physica Status Solidi (b)

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authoren We have employed a range of atomistic simulation methods to explore aspects of defect chemistry in ABO3 (where A2+= Ba2+ or Sr2+, and B4+= Zr4+ or Hf4+) perovskites, placing emphasis on processes relevant for application of these materials as high performance scintillators. Specifically, we examined intrinsic defect reactions, A and B excess nonstoichiometry and the solution of Me3+ rare earth cations. As has been predicted in previous studies, we find that Schottky disorder is the lowest energy intrinsic process. For nonstoichiometry, we predict that AO‐excess is compensated by oxygen vacancies and BO2‐excess is charge compensated by A vacancies (see abstract figure). Finally, for Me3+ solution, we considered several reactions for Me3+ cations ranging in size from Lu3+ to La3+, and the preferred reaction depends on the specific Me3+ cation and whether or not phase separation occurs. Nonstoichiometry mechanisms in ABO3 perovskites. Red spheres correspond to O2−, blue to A2+, and green to B4+.

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“…The requirements on the scintillation material performance differ in various fields, but high density, high effective atomic number, high light yield, fast scintillation decay, good time and energy resolution are generally required [5][6][7][8] . In recent years, new types of hafnate scintillators [9][10][11][12][13][14][15][16][17][18] have attracted wide attention, especially SrHfO 3 [19][20][21][22][23][24][25] . However, SrHfO 3 is difficult to prepare in the single crystal form because of its high melting point over 2700 ℃ .…”

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confidence: 99%

Fine-grained Ce,Y:SrHfO₃ Scintillation Ceramics Fabricated by Hot Isostatic Pressing

Zhu¹,

Kang²,

Chen³

et al. 2021

Journal of Inorganic Materials

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Ce:SrHfO 3 ceramics possess a strong stopping power to high-energy rays due to their high density and high effective atomic number. However, it is difficult to obtain transparent Ce:SrHfO 3 ceramics via traditional sintering method because of its orthogonal structure. In this work, Ce,Y:SrHfO 3 ceramics were prepared by long-time vacuum sintering and short-time vacuum pre-sintering combined with hot isostatic pressing (HIP). The Ce,Y:SrHfO 3 powders with a pure phase and a mean particle size of 152 nm were prepared by calcining at 1200 ℃ for 8 h using metal oxides and carbonates. The Ce,Y:SrHfO 3 ceramics vacuum-sintered at 1800 ℃ for 20 h are opaque with an average grain size of 28.6 μm, while those prepared by the two-step sintering method show good optical transmittance. The evolution of the microstructure in the process of densification was analyzed in detail, and the influence of the pre-sintering temperature on the density, microstructure and optical transparency of Ce,Y:SrHfO 3 ceramics was studied. The Ce,Y:SrHfO 3 ceramics pre-sintered at 1500 ℃ for 2 h with HIP post-treatment at 1800 ℃ for 3 h have the highest in-line transmittance of 21.6% at 800 nm with a far smaller average grain size of 3.4 μm. Under X-ray excitation, the Ce 3+ 5d-4f emission of Ce,Y:SrHfO 3 ceramics was observed at 400 nm, and the XEL integral intensity is 3.3 times higher than that of Bi 4 Ce 3 O 12 (BGO) crystals. The light yield of the Ce,Y:SrHfO 3 ceramics is approximately 3700 ph/MeV with the shaping time of 1 μs. Good optical quality and scintillation performance of Ce,Y:SrHfO 3 ceramics may expand the application range and potential in the field of scintillation detection.

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Rare-earth-free luminescent non-stoichiometric phases formed in SrO–HfO2 ternary compositions

Cited by 7 publications

References 32 publications

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO₃ perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO₃ perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

Intrinsic defects, nonstoichiometry, and aliovalent doping of ABO perovskite scintillators

Fine-grained Ce,Y:SrHfO₃ Scintillation Ceramics Fabricated by Hot Isostatic Pressing

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Rare-earth-free luminescent non-stoichiometric phases formed in SrO–HfO2 ternary compositions

Cited by 7 publications

References 32 publications

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO3 perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO3 perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

Intrinsic defects, nonstoichiometry, and aliovalent doping of ABO perovskite scintillators

Fine-grained Ce,Y:SrHfO3 Scintillation Ceramics Fabricated by Hot Isostatic Pressing

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High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO₃ perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

High dielectric constant and capacitance in ultrasmall (2.5 nm) SrHfO₃ perovskite nanoparticles produced in a low temperature non-aqueous sol–gel route

Fine-grained Ce,Y:SrHfO₃ Scintillation Ceramics Fabricated by Hot Isostatic Pressing