Differentiating between Acidic and Basic Surface Hydroxyls on Metal Oxides by Fluoride Substitution: A Case Study on Blue TiO from Laser Defect Engineering.

Both oxygen vacancies and surface hydroxyls play a crucial role in catalysis. Yet, their relationship is not often explored. Herein, we prepare two series of TiO (rutile and P25) with increasing oxygen deficiency and Ti concentration by pulsed laser defect engineering in liquid (PUDEL), and selectively quantify the acidic and basic surface OH by fluoride substitution.

Solid-state nuclear magnetic resonance investigation of synthetic phlogopite and lepidolite samples.

In the present work, our aim is to decipher the cationic ordering in the octahedral and tetrahedral sheets of two Al-rich synthetic materials, namely, phlogopites of nominal composition K(Mg Al )[Al Si O ](OH) F and lepidolites in the system trilithionite-polylithionite with composition K (Li Al )[Al Si O ](OH) F , by directly probing the aluminium distribution through Al and O magic-angle spinning, multiple-quantum magic-angle spinning, and Al- Al double-quantum single-quantum nuclear magnetic resonance (NMR) experiments. Notably, Al- Al double-quantum single-quantum magic-angle spinning NMR spectra, recorded at 9.34 and/or 20.

Crystal chemistry and stability of "Li7La3Zr2O12" garnet: a fast lithium-ion conductor.

Recent research has shown that certain Li-oxide garnets with high mechanical, thermal, chemical, and electrochemical stability are excellent fast Li-ion conductors. However, the detailed crystal chemistry of Li-oxide garnets is not well understood, nor is the relationship between crystal chemistry and conduction behavior. An investigation was undertaken to understand the crystal chemical and structural properties, as well as the stability relations, of Li(7)La(3)Zr(2)O(12) garnet, which is the best conducting Li-oxide garnet discovered to date.

Crystal structure and stability of β-Na(2)ThF(6) at non-ambient conditions.

The crystal structure and stability of β-Na(2)ThF(6) at non-ambient conditions have been studied with calorimetric analysis, second harmonic generation measurements, and (19)F and (23)Na magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, as well as synchrotron x-ray single-crystal and powder diffraction. The twinned structure (P321, Z = 1) is built of chains of capped trigonal prisms around the Th atoms formed along the c-axis through sharing of the basal faces. More distorted capped trigonal prisms around the Na atoms share their basal and equatorial faces with each other.