W e present the measurement of the p ositron lif etime spectra in the subsurf ace zones in copp er samples with surf aces damaged in dry and lubric atio n condition s. W e observe that close to the damaged surf ace the single vacancies w ere present, but deep er in the sample treated in the dry conditio n the vacancy clusters w ere detected. A zone with dislo catio ns w as located deep er than ...

A new polymorph of NaSbO(3) has been synthesized at 10.5 GPa and 1150 degrees C in a uniaxial split sphere anvil type press (USSA-2000) and recovered back to ambient conditions. The high-pressure form of NaSbO(3) adopts an orthorhombically distorted perovskite structure, isostructural with CaTiO(3), GdFeO(3), and NaTaO(3). The space group is Pnma, and the unit cell dimensions are a = 5.43835(6)...

We present a method for increasing the dielectric constant of CaTiO3/CaCu3Ti4O12 (CTO/CCTO) composites and retaining low-loss tangent (tan?) by doping with Ge dopant. The Ge-doped CTO/CCTO were fabricated using one-step processing method. phase composition microstructure analyses confirmed existence CTO CCTO phases, in which ions can be substituted into both phases. mean grain sizes two phases ...

An A-site disordered high entropy perovskite (Pb 1/6 Ba Sr Ca Na Bi )TiO 3 (PBSCNBi) ceramic was prepared by a solid-state reaction method. XRD and scanning electron microscopy-energy dispersive x ray confirmed single-phase tetragonal solid solution. Dielectric hysteresis loop measurements showed relaxor ferroelectricity at room temperature; Curie Weiss fitting gives Burns temperature (T b ) of...

The biocompatibility of calcium ion (Ca)-incorporated Ti6Al4V alloy implants, produced by hydrothermal treatment using a Ca-containing solution, was investigated. The surface characteristics were evaluated by scanning electron microscopy, thin-film X-ray diffractometry, Auger electron spectroscopy, and stylus profilometry. The viability of MC3T3-E1 cells on Ca-incorporated machined Ti6Al4V surf...