Synthesis and crystal chemistry of microporous titanates K (Ti,M)8O16 where M=Sc–Ni

Spin-glass behavior in KxRu4−yNiyOStimpson1, Powell2, Stenning3 et al. 2018Phys. Rev. B9010View full textAdd to dashboardCite

“…The addition of Co 2+ to the framework disrupts the helical order giving rise to a ferrimagnetically ordered state with a greatly increased transition temperature, TC, of 180 K. 7 The same group also investigated the magnetic behaviour of Bi1.7V8O16 and Sc to Ni doped (denoted by M) KxTi8-yMyO16 materials. [12][13][14] All KxTi8-yMyO16 materials exhibited curie paramagnetism consistent with the limited amounts of magnetic species incorporated into these materials. 13 In contrast, whilst the Bi1.7V8O16 material exhibits no long range magnetic order, as observed by powder neutron diffraction, magnetotransport measurements suggest a dimerization of the mixed spin-cations.…”

“…[12][13][14] All KxTi8-yMyO16 materials exhibited curie paramagnetism consistent with the limited amounts of magnetic species incorporated into these materials. 13 In contrast, whilst the Bi1.7V8O16 material exhibits no long range magnetic order, as observed by powder neutron diffraction, magnetotransport measurements suggest a dimerization of the mixed spin-cations. 12 Multiferroic character has also been reported in BaMn3Ti4O14.25 hollandite.…”

Polytetrafluorethylene‐based high‐k composites with low dielectric loss filled with priderite (K1.46Ti7.2Fe0.8O16)

“…Thus, the ε' ( f ) dependence allows dividing the composites in three groups 1–5, 20 and 90, 50 and 70 wt % similar to the case of the σ(f ) dependence. The dispersion of permittivity on the ε'‐f curves for the composites with a high PPT‐Fe content can be related to the polarization processes in the ceramic ferroelectric, such as the electron density displacement in accordance with the scheme of Ti 4+ + e ↔ Ti 3+ /Fe 3+ + e ↔ Fe 2+, accompanying with the local movement of K + ions in the channels of hollandite‐like structure.…”

Tuning the electronic band structure of microporous titanates with the hollandite structure

“…The details of the single crystal growth, stoichiometric determination, and structural studies can be found in ref. 32. The single crystals were ground using an agate mortar and pestle prior to all spectroscopic measurements.…”

“…[28][29][30][31] Occupation of the hollandite channel sites by alkali cations results in mixed-valency of Ti between 3+ and 4+ depending on the concentration and ionic charge of the cation. This mixed-valency results in Curie-type paramagnetism 32 whilst electrical properties show insulating behavior. 33 Another advantage of the hollandite structure over TiO 2 phases is the facile accommodation of other transition metals into its framework structure.…”