Microstructure studies of potassium hexatitanate whiskers

Abstract

Microstructures of potassium hexatitanate (K2Ti6O13) whiskers prepared by calcination of KF and TiO2 mixture were studied through high-resolution electron microscopy. The rod axis of a K2Ti6O13 whisker is along the [010] direction. These whiskers normally have a lamellar structure in their longitudinal direction, and adjacent lamellae usually have the same crystallographic orientation. Each lamella might be further divided into several fine layers with a width on the nanometer scale in the same crystallographic orientation. The whisker can be split in the longitudinal direction along either the boundary between two lamellae or the weak binding crystal plane, such as (100) and (201) planes. The mechanisms for the formation of lamella and layer structures and for the splitting of whiskers are discussed.

Large‐Scale Hydrothermal Synthesis of Twinned Rutile Titania

“…Thus, when K 2 Ti 6 O 13 is subjected to the strong acid and is heated, whiskers tend to cleave on the weak‐binding crystallographic planes, such as the (100) or (201) plane. Consequently, the incomplete translation might lead to the formation of a nano‐scale lamellar structure, 15 as shown in Fig. 3(a).…”

Oxidic Nanotubes and Nanorods—Anisotropic Modules for a Future Nanotechnology

“…Physical evaporation at 300 8C from a bulk gallium target [133] SnO 2 Evaporation of metal oxide powders at high temperatures [125] Ga 2 O 3 DC arc discharge (GaN, graphite, nickel powder) [134] SiO 2 Helical mesostructured tubules from Vortex-Assisted Surfactant Templates [147] Ga 2 O 3 Electric arc discharge of GaN powders mixed with Ni and Co [135] TiO 2 Sol-gel template method employing alumina membranes [148] Ga 2 O 3 Heating of Ga with SiO 2 powder and a Fe 2 O 3 catalyst [136] V 2 O 5 Vanadium pentoxide gels [149] GeO 2 Carbon-nanotube confined reaction of metallic Ge [137] V 2 O 5 Templating against carbon nanotubes [65] In 2 O 3 Evaporation of metal oxide powders at high temperatures [125] WO 3 Templating against carbon nanotubes [65] In 2 O 3 Growth from Au droplets [138] YBCO Laser ablation of a high T c superconductor YBa 2 Cu 3 O 7 [150] IrO 2 Templating against carbon nanotubes [65] ZnO Gas reaction employing Zn and H 2 O [151] K 2 Ti 6 O 13 Calcination of KF and TiO 2 [139] ZnO Evaporation of metal oxide powders at high temperatures [125] MgO Vapor-solid growth process with in situ generated Mg vapor [114] ZnO Catalyzed epitaxial growth [152] MgO Heating of MgCl 2 at 750 8C in mixture gas (Ar/H 2 ) [b] [140] ZnO Self-organization of nanoparticles [153] Mg(OH) 2 Solvothermal treatment of Mg, H 2 O, and ethylenediamine [141] [a] AOT sodium bis(2-ethylhexyl)sulfosuccinate.…”

Synthesis and characterization of potassium hexatitanate using boric acid as the flux

“…Usually, potassium carbonate (K 2 CO 3 ) and titanium dioxide (TiO 2 ) are starting materials that react at high temperatures [1,2,[6][7][8]. The flux growth method has been extensively investigated and has been shown to provide fine single crystals of small size, depending on the synthesis conditions.…”