Quantum diffusion regime of charge transport in GdB6 caused by electron and lattice instability

Abstract

Based on accurate X-ray structure analysis of GdB 6 over the temperature range 85-300 K it has been shown that anomalously strong charge carrier scattering in the quantum diffusion regime of charge transport in this compound arises due to the formation of (i) dynamically coupled Gd 3+ dimers of about 3.3 Å in size with an energy of quasi-local oscillations ~ 7 -8 meV and (ii) dynamic charge stripes along the [001] direction of the cubic lattice. It has been revealed that anharmonic approximation is useful when analyzing the static and dynamic components of the atomic displacement parameters of gadolinium. The barrier height of double-well potential of Gd 3+ ions was determined both from low-temperature heat capacity measurements and from the electron density distribution reconstructed from X-ray data. 72.15.-v, 72.15.Eb, 63.20.Pw, 61.46.-w PACS:

Combined Gadolinium and Boron Neutron Capture Therapies for Eradication of Head-and-Neck Tumor Using Gd10B6 Nanoparticles under MRI/CT Image Guidance

“…As shown in Figure S3b, the zeta potential values measured at pH 7.4 were +12, −11.5, and +4.5 mV for bare Gd 10 B 6 NPs, F127–Gd 10 B 6 NPs and anti-EGFR-Gd 10 B 6 NPs, respectively, indicating that F127–Gd 10 B 6 NPs have a negatively charged surface, while bare Gd 10 B 6 NPs and anti-EGFR-Gd 10 B 6 NPs were positively charged. It was reported that in lanthanide hexaborides, it is commonly observed to have structural defects boron vacancies , especially in the presence of cubic lattice distortions, which can explain the positive surface charge of the Gd 10 B 6 nanoparticles. Gadolinium is a rare earth metal element with paramagnetic properties from unpaired electrons in the 4f orbitals.…”

“…The FTIR absorption band at 1730 cm −1 of the F127-Gd 10 B 6 NPs is due to the stretching vibration of the carboxyl > C�O moieties from F127 (see the red curve in Figure S3a), which was shifted to a lower energy position of 1640 cm −1 upon conjugation with anti-EGFR, due to the keto−enol tautomerization. The FTIR bands at ∼3000 cm −1 for both F127-Gd 10 B 6 NPs and anti-EGFR-F127-Gd 82,83 especially in the presence of cubic lattice distortions, which can explain the positive surface charge of the Gd 10 B 6 nanoparticles. Gadolinium is a rare earth metal element with paramagnetic properties from unpaired electrons in the 4f orbitals.…”