Mixed electronic and oxide ionic conduction and migration mechanisms in digermanate La2−xCaxGe2O7−x/2

Lu, Liang; Li, Xiaohui; Wang, Xiaoge; Luo, Zhaoji; Lin, Kwei-Jay; Li, Qiang; Deng, Sihao; He, Lunhua; Kuang, Xiaojun; Xing, Xianran

doi:10.1039/d3dt00708a

Dalton Trans.

2023

DOI: 10.1039/d3dt00708a

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Mixed electronic and oxide ionic conduction and migration mechanisms in digermanate La_2−xCa_xGe₂O_7−x/2

Liang Lu

Xiaohui Li

Xiaoge Wang

et al.

Abstract: Mixed electronic and oxide ionic conduction was enabled in digermanate-type La2-xCaxGe2O7-x/2 containing Ge3O10 chains and isolated GeO4 units by substitution of La3+ with Ca2+. The structure and solid solution limit...

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2024

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Structural and spectroscopic characterization of Ba₃RE₂(Ge₃O₉)₂ (RE = La, Pr, Nd) and Ba₃La₂₋ _xEu_x(Ge₃O₉)₂ cyclogermanates

Lipina,

Baklanova,

Popov

et al. 2024

J. Phys. D: Appl. Phys.

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Ba3RE2(Ge3O9)2 (RЕ = La, Pr, Nd) and Ba3La2‑xEux(Ge3O9)2 germanates were prepared via solid-state reaction for the first time. The crystal structure of the compounds was identified using X-ray powder diffraction (XRPD). The obtained results indicate that all germanates are isostructural and crystallize in a monoclinic crystal system with the space group С2/c, Z = 4. The crystal lattice consists of two kinds of layers, formed from [Ge3O9]6- rings or from Ba2+/RE3+ cations. The density functional theory (DFT) calculations performed on a rich set of Ba3RE2(Ge3O9)2 compounds have approved a high thermodynamic stability of monoclinic modification and chair conformation of [Ge3O9]6- rings. The luminescence properties of Ba3La2‑xEux(Ge3O9)2 phosphors have been studied under 239 nm and 393 nm excitation. The spectra contain narrow lines in the orange-red spectral region, associated with the intraconfiguration f‒f transitions in Eu3+. The most intensive lines are located at 603 – 635 nm and are caused by 5D0 → 7F2 transition in Eu3+. The concentration dependence indicates an effective energy transfer due to dipole-dipole interaction. The Ba3La2‑xEux(Ge3O9)2 phosphors possess a high color purity and thermal stability of luminescence that allows one to predict that they may be successfully used in solid state lighting.

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Structural and spectroscopic characterization of Ba₃RE₂(Ge₃O₉)₂ (RE = La, Pr, Nd) and Ba₃La₂₋ _xEu_x(Ge₃O₉)₂ cyclogermanates

Lipina,

Baklanova,

Popov

et al. 2024

J. Phys. D: Appl. Phys.

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Mixed electronic and oxide ionic conduction and migration mechanisms in digermanate La_2−xCa_xGe₂O_7−x/2

Abstract: Mixed electronic and oxide ionic conduction was enabled in digermanate-type La2-xCaxGe2O7-x/2 containing Ge3O10 chains and isolated GeO4 units by substitution of La3+ with Ca2+. The structure and solid solution limit...

Cited by 1 publication

References 54 publications

Structural and spectroscopic characterization of Ba₃RE₂(Ge₃O₉)₂ (RE = La, Pr, Nd) and Ba₃La₂₋ _xEu_x(Ge₃O₉)₂ cyclogermanates

Structural and spectroscopic characterization of Ba₃RE₂(Ge₃O₉)₂ (RE = La, Pr, Nd) and Ba₃La₂₋ _xEu_x(Ge₃O₉)₂ cyclogermanates

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Mixed electronic and oxide ionic conduction and migration mechanisms in digermanate La2−xCaxGe2O7−x/2

Abstract: Mixed electronic and oxide ionic conduction was enabled in digermanate-type La2-xCaxGe2O7-x/2 containing Ge3O10 chains and isolated GeO4 units by substitution of La3+ with Ca2+. The structure and solid solution limit...

Cited by 1 publication

References 54 publications

Structural and spectroscopic characterization of Ba3RE2(Ge3O9)2 (RE = La, Pr, Nd) and Ba3La2− xEux(Ge3O9)2 cyclogermanates

Structural and spectroscopic characterization of Ba3RE2(Ge3O9)2 (RE = La, Pr, Nd) and Ba3La2− xEux(Ge3O9)2 cyclogermanates

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Mixed electronic and oxide ionic conduction and migration mechanisms in digermanate La_2−xCa_xGe₂O_7−x/2

Structural and spectroscopic characterization of Ba₃RE₂(Ge₃O₉)₂ (RE = La, Pr, Nd) and Ba₃La₂₋ _xEu_x(Ge₃O₉)₂ cyclogermanates

Structural and spectroscopic characterization of Ba₃RE₂(Ge₃O₉)₂ (RE = La, Pr, Nd) and Ba₃La₂₋ _xEu_x(Ge₃O₉)₂ cyclogermanates