Yb valence state in Yb5Rh4Ge10

Sato, Hitoshi; Utsumi, Yuki; Katoh, K.; Mimura, Koji; Ueda, Shigenori; Yamaoka, H.; Rousuli, Awabaikeli; Arita, Masashi; Umeo, Kazunori; Shimada, Kenya; Namatame, H.; Takeuchi, Masaki

doi:10.1002/pssc.201600164

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…The magn etic properties have been interpreted as easy-plane-type magnetism with preferred magnetisation in the (0 0 1) plane [53]. Sato et al [118] have determined a valence of +2.8 for Yb from x-ray absorption spectroscopy. A value less than 3 is at variance with Yb 3+ in Yb 5 Ir 4 Si 10 (section 3.5).…”

Section: Magnetism In Gd 5 Ir 4 Ge 10mentioning

confidence: 99%

Unusual ground states in ${R_5T_4X_{10}}$ (R = rare earth;T = Rh, Ir; andX = Si, Ge, Sn): a review

Ramakrishnan

Smaalen

2017

Rep. Prog. Phys.

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Rare earth compounds of the type [Formula: see text] (R = rare earth; T = Rh, Ir, and X = Si, Ge, Sn) display a variety of phase transitions towards exotic states, including charge density waves (CDW), local moment magnetism, antiferromagnetism in the heavy fermion state, superconductivity and giant positive magnetoresistance. They support strongly correlated electron systems. In particular, R Ir [Formula: see text] (R = Dy-Lu) exhibit strong coupling CDWs with high transition temperatures, and superconductivity or magnetic ordering at lower temperatures. [Formula: see text] [Formula: see text] (R = Gd-Tm; T = Co, Rh, Ir) show multiple magnetic transitions with large magnetoresistance below the magnetic transitions. Finally, the light rare earth series [Formula: see text] [Formula: see text] (R = Ce, Pr, Nd; T = Rh, Ir) display heavy fermion behaviour (for Ce and Pr) or possess giant positive magnetoresistance (for Nd) at low temperatures. This review provides a comprehensive overview of compounds, crystal structures and phase transitions. This is followed by an in-depth discussion of the mechanisms of the phase transitions and the properties of the ordered states.

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Section: Magnetism In Gd 5 Ir 4 Ge 10mentioning

confidence: 99%

Unusual ground states in ${R_5T_4X_{10}}$ (R = rare earth;T = Rh, Ir; andX = Si, Ge, Sn): a review

Ramakrishnan

Smaalen

2017

Rep. Prog. Phys.

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“…[63] The Yb 3d 5/2 spectra contain the main Yb 3+ feature at 1524-1536 eV, a plasmon satellite (energy loss) peak at 1546 eV, and a small contribution of Yb 2+ at 1520 eV for sample A. [64][65][66][67] Additional core levels are shown in the Supporting Information. The contribution of Yb 2+ in sample A to the total Yb 3d 5/2 signal is at most 4%.…”

Section: Depth-profiling Haxpesmentioning

confidence: 99%

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

Clark

Andresen

Sear

et al. 2022

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The spatial distribution and concentration of lanthanide activator and sensitizer dopant ions are of key importance for the luminescence color and efficiency of upconverting nanoparticles (UCNPs). Quantifying dopant ion distributions and intermixing, and correlating them with synthesis methods require suitable analytical techniques. Here, X‐ray photoelectron spectroscopy depth‐profiling with tender X‐rays (2000–6000 eV), providing probe depths ideally matched to UCNP sizes, is used to measure the depth‐dependent concentration ratios of Er3+ to Yb3+, [Er3+]/[Yb3+], in three types of UCNPs prepared using different reagents and synthesis methods. This is combined with data simulations and inductively coupled plasma‐optical emission spectroscopy (ICP‐OES) measurements of the lanthanide ion concentrations to construct models of the UCNPs’ dopant ion distributions. The UCNP sizes and architectures are chosen to demonstrate the potential of this approach. Core‐only UCNPs synthesized with XCl3·6H2O precursors (β‐phase) exhibit a homogeneous distribution of lanthanide ions, but a slightly surface‐enhanced [Er3+]/[Yb3+] is observed for UCNPs prepared with trifluroacetate precursors (α‐phase). Examination of Yb‐core@Er‐shell UCNPs reveals a co‐doped, intermixed region between the single‐doped core and shell. The impact of these different dopant ion distributions on the UCNP's optical properties is discussed to highlight their importance for UCNP functionality and the design of efficient UCNPs.

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Yb valence state in Yb₅Rh₄Ge₁₀

Cited by 2 publications

References 18 publications

Unusual ground states in ${R_5T_4X_{10}}$ (R = rare earth;T = Rh, Ir; andX = Si, Ge, Sn): a review

Unusual ground states in ${R_5T_4X_{10}}$ (R = rare earth;T = Rh, Ir; andX = Si, Ge, Sn): a review

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

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Yb valence state in Yb5Rh4Ge10

Cited by 2 publications

References 18 publications

Unusual ground states in ${R_5T_4X_{10}}$ (R = rare earth;T = Rh, Ir; andX = Si, Ge, Sn): a review

Unusual ground states in ${R_5T_4X_{10}}$ (R = rare earth;T = Rh, Ir; andX = Si, Ge, Sn): a review

Quantification of the Activator and Sensitizer Ion Distributions in NaYF4:Yb3+, Er3+ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission

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Yb valence state in Yb₅Rh₄Ge₁₀

Quantification of the Activator and Sensitizer Ion Distributions in NaYF₄:Yb³⁺, Er³⁺ Upconverting Nanoparticles Via Depth‐Profiling with Tender X‐Ray Photoemission