High-temperature thermodynamic properties of LuPO4

Никифорова, Г. Е.; Ryumin, M. A.; Гавричев, К. С.; Gurevich, V. M.

doi:10.1134/s0020168512080122

Cited by 13 publications

(5 citation statements)

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“…3 In addition to its outstanding scintillation properties, LnPO 4 matrix is also fascinating because of its high thermal and chemical stability, high index of refraction, and very low solubility in water. 4,5 All of these advantages have inspired efforts toward optimizing the luminescence properties of Ce:LuPO 4 via matching the Ce 3+ center and LuPO 4 matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Among inorganic scintillators, lutetium orthophosphate doped with cerium ions (Ce:LuPO 4 ) is a promising materials due to its high light yield of 17 200 photons/MeV and short decay time of 25 ns . In addition to its outstanding scintillation properties, LnPO 4 matrix is also fascinating because of its high thermal and chemical stability, high index of refraction, and very low solubility in water. , All of these advantages have inspired efforts toward optimizing the luminescence properties of Ce:LuPO 4 via matching the Ce 3+ center and LuPO 4 matrix.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization-Dependent Luminescence Properties of Ce:LuPO₄

Sun

Wang

et al. 2016

Inorg. Chem.

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The luminescence properties of Ce:LuPO4 depend on both the Ce(3+) center and the host lattice. In this article, we studied the dependence of the luminescence properties of Ce:LuPO4 on both the doping concentration of Ce(3+) and the size and morphology of the LuPO4 matrix at micro- and nanosize regimes. The crystalline behavior of Ce:LuPO4, including its size and shape, was investigated via precursor transformation crystallization. On the basis of this crystallization approach, Ce:LuPO4 hollow nanospheres, nanorods, and regular tetrahedrons were obtained. For micro- and nanostructured Ce:LuPO4, the surface-induced chemical bonding architecture can be effectively varied by controlling the size of the crystalline material and its geometry. Our experimental observations demonstrate that one-dimensional Ce:LuPO4 nanorods doped with 0.1 mol % Ce(3+) possess the best performance among the as-prepared samples. The significant anisotropy of Ce:LuPO4 nanorods can result in a larger specific surface area and enhanced luminescence properties. Moreover, the improved luminescence property of Ce:LuPO4 nanostructures can also be optimized by increasing the preferential anisotropic chemical bonding architecture to regulate the 5d level of Ce(3+). Our work also shows that the photoluminescence emission intensity of Ce:LuPO4 nanorods is increased as the surface area normal to their axial direction increases. From the standpoint of crystallization, the luminescence properties of Ce(3+) in nano- and microsize matrixes can be well-optimized by controlling the crystalline behavior of the host lattice under proper synthesis conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Crystallization-Dependent Luminescence Properties of Ce:LuPO₄

Sun

Wang

et al. 2016

Inorg. Chem.

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“…Besides the thermal conductivity, the heat capacity is the most widely investigated thermodynamic parameter of lanthanide phosphates. There is a series of experimental papers on measurements of this parameter for different monazite compositions (Thiriet et al, 2004, 2005a; Popa and Konings, 2006; Popa et al, 2006a,b; Gavrichev et al, 2008, 2009; Bauer et al, 2016), including Pu-rich compounds (Thiriet et al, 2005b; Popa et al, 2007a; Benes et al, 2011), and xenotime (Gavrichev et al, 2006, 2010, 2012, 2013; Nikiforova et al, 2012; Gysi et al, 2016). These measurements revealed a quasi-random-like variation of the standard heat capacity and the standard entropy along the lanthanide series.…”

Section: Resultsmentioning

confidence: 99%

Rare-Earth Orthophosphates From Atomistic Simulations

Kowalski

Kegler

et al. 2019

Front. Chem.

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Lanthanide phosphates ( LnPO 4 ) are considered as a potential nuclear waste form for immobilization of Pu and minor actinides (Np, Am, and Cm). In that respect, in the recent years we have applied advanced atomistic simulation methods to investigate various properties of these materials on the atomic scale. In particular, we computed several structural, thermochemical, thermodynamic and radiation damage related parameters. From a theoretical point of view, these materials turn out to be excellent systems for testing quantum mechanics-based computational methods for strongly correlated electronic systems. On the other hand, by conducting joint atomistic modeling and experimental research, we have been able to obtain enhanced understanding of the properties of lanthanide phosphates. Here we discuss joint initiatives directed at understanding the thermodynamically driven long-term performance of these materials, including long-term stability of solid solutions with actinides and studies of structural incorporation of f elements into these materials. In particular, we discuss the maximum load of Pu into the lanthanide-phosphate monazites. We also address the importance of our results for applications of lanthanide-phosphates beyond nuclear waste applications, in particular the monazite-xenotime systems in geothermometry. For this we have derived a state-of-the-art model of monazite-xenotime solubilities. Last but not least, we discuss the advantage of usage of atomistic simulations and the modern computational facilities for understanding of behavior of nuclear waste-related materials.

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“…The accuracy in various energy levels can be verified from the measured and calculated Schottky heat capacity. This type of correlation of heat capacity with spectroscopy data is largely studied for compounds like RE2O3 [33][34][35][36][37][38][39][40][41], RE2S3 [42][43][44][45][46][47], RE (OH)3 [48][49][50][51][52] and REPO4 [53][54][55][56][57][58][59][60][61][62][63][64]. …”

Section: Heat Capacity Of Re6uo12(s)(re=la Pr Nd Sm)mentioning

confidence: 99%