Neodymium substitution effects in sol–gel derived Y3−xNdxAl5O12

In this study yttrium aluminium garnet (YAG) specimens in which yttrium was partially substituted by lanthanum Y3-xLaxAl5O12 (YLaAG) were prepared by an aqueous sol-gel method. The resulting sol was concentrated by slow solvent evaporation at 65 oC. The obtained gels were dried in an oven at 120 oC for 24 h. The obtained precursor gel powders were calcined at 800 oC and 1000 oC in air. YLaAG samples were analyzed by X-ray diffraction (XRD), solid state nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and electron paramagnetic resonance (EPR) methods. Luminescence measurements of YLaAG samples were also recorded. The XRD analysis results showed that only low substitution of yttrium by lanthanum is possible in Y3-xLaxAl5O12 without destroying garnet crystal structure. It was also demonstrated in this study, that solid state NMR and EPR methods are indispensable tools for the explanation of processes and properties observed in the newly synthesized Y3-xLaxAl5O12 compounds.

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“…Several lanthanide aluminium garnets (i.e., La 3 The monophasic Y 3-x Nd x Al 5 O 12 garnet has been obtained when x ranged from 0.1 to 0.8 [15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of lanthanum substitution effects in yttrium aluminium garnet: importance of solid state NMR and EPR methods

Laurikenas

Sakalauskas

Maršalka

et al. 2020

J Sol-Gel Sci Technol

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“…[1][2][3][4][5] Neodymium-doped Yttrium Aluminium Garnet (Nd:YAG) single crystals are widely used for solid lasers in many areas such as material processing, laser medicine, laser ranging and target indicators. [1][2][3][4][5] Neodymium-doped Yttrium Aluminium Garnet (Nd:YAG) single crystals are widely used for solid lasers in many areas such as material processing, laser medicine, laser ranging and target indicators.…”

Section: Introductionmentioning

confidence: 99%

“…The suspending liquid was stirred and aged for one hour, then the precipitates were separated and washed with distilled water four times to remove harmful ions such as NO 3 2 and NH 4 + , and dried for twelve hours at 90 uC. According to the required stoichiometric ratio of Nd:YAG, Y 2 O 3 and Nd 2 O 3 were dissolved in HNO 3 and diluted with distilled water, then mixed with Al(NO 3 ) 3 ?9H 2 O aqueous solution, and finally a homogeneous salt solution was obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Yttrium Aluminium Garnet (YAG) is widely used for laser materials and other luminous matrix materials due to its excellent optical properties. [1][2][3][4][5] Neodymium-doped Yttrium Aluminium Garnet (Nd:YAG) single crystals are widely used for solid lasers in many areas such as material processing, laser medicine, laser ranging and target indicators. 6 The growth of Nd:YAG single crystals is a complicated and difficult process.…”

Section: Introductionmentioning

confidence: 99%

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Influence of neodymium-doping on structure and properties of yttrium aluminium garnet

Zhang

Yue

et al. 2013

CrystEngComm

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We study the impact of the Nd-doping on the grain formation, the crystal structure, and the fluorescence of the Yttrium Aluminum Garnet (YAG). The results show that Nd-doping leads to the YAG lattice expansion and distortion, and hence to an increase in defect concentration. This is attributed to substitution of larger Nd 3+ ions for smaller Y 3+ ions. As a result, the fluorescence intensity of Nd:YAG increases and reaches a maximum at 3 at% Nd. Above 3 at% Nd, the lattice distortion becomes more evident, and the Nd 3+ ions segregate on the surface of grains and thus the fluorescence intensity decreases. Above 8 at% Nd, a large fraction of Nd 3+ ions cannot enter the YAG lattice, but reside on the surface of grains instead, leading to formation of disordered clad layers. Above 10 at% Nd, a high degree of disorder in the structure is induced by the Nd 3+ segregation both in the interior and boundary of grains.Above 15 at% Nd, Schottky and Frenkel defects appear due to the lattice distortion. In general, at Nd . 3 at% the Nd 3+ segregation and concentration quenching cause the attenuation of the fluorescence of Nd:YAG. 2 Experimental 2.1 Materials preparation Analytical grade chemicals such as Al(NO 3 ) 3 ?9H 2 O, Y 2 O 3 , Nd 2 O 3 , HNO 3 , NH 4 HCO 3 , and NH 4 OH were used for synthesiz-3 Electronic supplementary information (ESI) available: TG and DTA curves of YAG precursors. See

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