Tetragonal Zirconia Polycrystals stabilized with 3% mol. content of yttria (3Y-TZP) has excellent properties in terms of strength and fracture toughness. These properties are mostly imputable to the transformation toughening mechanism, by which the doped metastable tetragonal phase of zirconia transforms to monoclinic under applied stress ahead of a crack. This phenomenon is accompanied by a vo...

44 samples of tetragonal hen egg-white lysozyme (HEWL) were obtained as a series of polycrystalline precipitates at 277 K and room temperature in the pH range between 6.56 and 3.33. The precipitates were investigated by the collection of high-resolution powder X-ray diffraction data at 295 K, which reveal the tetragonal or orthorhombic forms of lysozyme depending on the temperature and pH of cr...

High permittivity barium titanate zirconate (BTZ) is often used for dielectrics in commercial multilayer ceramic capacitors, actuators applications, and is a highly promising material for dynamic random access memory (DRAM) and microelectromechanical system (MEMS) applications due to its very stable, high insulating characteristic against voltage. Especially, the material is promising for envir...

In this article we consider a simple model for a c–axis Pb/YBa2Cu3O7−δ Josephson junction. The observation of a nonzero current in such a junction by Sun et al. [A. G. Sun, D. A. Gajewski, M. B. Maple, R. C. Dynes, Phys. Rev. Lett. 72, 2267 (1994)] has been taken as evidence against d–wave superconductivity in YBa2Cu3O7−δ. We suggest, however, that the pairing interaction in the CuO2 planes may...

We have examined the crystal structures and structural phase transitions of the deuterated, partially deuterated and hydrogenous organic-inorganic hybrid perovskite methyl ammonium lead iodide (MAPbI3) using time-of-flight neutron and synchrotron X-ray powder diffraction. Near 330 K the high temperature cubic phases transformed to a body-centered tetragonal phase. The variation of the order par...

Nanostructured Mn Ga ribbons with and 1.1 were prepared using arc-melting, melt-spinning and annealing. As-spun samples crystallized into hexagonal and cubic Heusler crystal structures based on the concentration of Mn in Mn Ga. Upon vacuum-annealing the samples at 450 C for about 50 hours, both the hexagonal and cubic structures transformed into a tetragonal structure. High-temperature x-ray di...

To clarify further the mechanism of regulation by phosphorylation of isocitrate dehydrogenase, cocrystallization of isocitrate dehydrogenase and isocitrate dehydrogenase kinase/phosphatase in the presence of an ATP analog was attempted. Although cocrystallization was unsuccessful, a new crystal form of isocitrate dehydrogenase was obtained which provides insight into the phosphorylation mechani...

We report on the different roles of two orbital-active Fe 2+ at the A site and V 3+ at the B site in the magnetic exci-tations and on the anomalous spin-wave broadening in FeV 2 O 4. FeV 2 O 4 exhibits three structural transitions and successive paramagnetic (PM)–collinear ferrimagnetic (CFI)–noncollinear ferrimagnetic (NCFI)/ferroelectric transitions. The high-temperature tetragonal/PM–orthorh...

The phase diagram for the YTaO4-ZrO2 quasi-binary has been determined up to 1600 °C. There are three distinct compositional regimes: an extensive YTaO4 solid solution, an extensive ZrO2 solid solution and a two-phase intermediate region. The addition of ZrO2 to YTaO4 decreases the M–T transition temperature almost linearly from 1426 °C to approximately 450 °C at the solubility limit (∼28mol% Zr...

The cis-[WO2F4] anion is inherently acentric and contains polarizable WdO bonds, making it a good candidate for second-harmonic generation (SHG). However, the orientational disorder commonly found in crystal structures containing [WO2F4] must be understood as a first step toward engineering a polar SHG material with this anion. The strategy of crystallizing the [WO2F4] anion with two different ...