Untersuchungen über die Verbindungen des Niobiums

Abstract

Ein dritter Versuch grlindete sich auf Vogel's*) Versuch *) Schweigger'e Jom. 23'30. voo Journ. I. p n k t. Chemle. XCVlI. 8.

Structures and Properties of NbOF3 and TaOF3 — with a Remark to the O/F Ordering in the SnF4 Type Structure

“…The first report on oxide fluorides with elements of the 14 th group from Marignac dates back to the second half of the 19 th century [1]. It took nearly nine decades until some of these compounds, such as NbO 2 F or Nb 3 O 7 F have structurally been characterized [2,3,4].…”

Structural Modeling of O/F Correlated Disorder in TaOF3 and NbOF3–x(OH)x by Coupling Solid-State NMR and DFT Calculations

“…NbOF 3 has been known since the second half of the nineteenth century . A hundred years later, its presence as a byproduct was mentioned in two studies on NbO 2 F and NbF 3 and then in the gas state as a product of the decomposition of NbO 2 F. 5 MOF 3 (M = Nb, Ta) have been previously synthesized by Nieder-Vahrenholz and Schäfer, by reaction of MF 5 with oxide glass or M 2 O 5 and by Köhler et al by reaction of MF 5 with MO 2 F. The aqueous solution synthesis proposed by Frevel and Rinn, which was used by Köhler et al, leads to compounds that both contain hydroxyl defects and metal vacancies. , Consequently, in the present work, MO 2 F was prepared by solid-state synthesis from a mixture of MF 5 (Alfa Aesar, 99.9 and 99% for TaF 5 and NbF 5 , respectively) and M 2 O 5 (Alfa Aesar, 99.85 and 99.9% for Ta 2 O 5 and Nb 2 O 5 , respectively) with an excess of MF 5 (5 and 10% for NbF 5 and TaF 5 , respectively) relative to the ideal 2:1 molar ratio.…”