Effect Of Ca Content Research Articles

Ｚｎ１−ｘＣａｘＯ（ｘ＝０‐０．２０）固溶体粉末の黄色ブドウ球菌に対する殺菌作用におけるＣａ量ｘの効果

The effect of Ca content in Zn1-x, CaxO(x=0-0.20) powders on its bactericidal action against Staphylococcus aureus was investigated. The bactericidal action increased with an increase of Ca content in Zn1-x, CaxO, indicating the possibility of control of the antimicrobial efficacy. The death of S. aureus by the powder slurries followed first-order kinetics, and the concentration of Ca dopant slightly enhanced the dilution coefficient of the bactericidal action. Though the pH value of as-prepared powder slurries also increased with the increase of Ca content, its bactericidal action was greater than NaOH solution with the same pH value as the slurries.

Short-range-order state in the Sr2Nd1−xCaxCu2O5+yF1+δ (0⩽x⩽1) superconducting system

The structural features of the Sr2Nd1−xCaxCu2O5+yF1+δ (0⩽x⩽1) oxyfluoride system have been investigated by electron diffraction and high resolution electron microscopy. The short-range-order (SRO) state has been observed in the Sr2Nd0.5Ca0.5Cu2O5+yF1+δ oxyfluoride (Tc≈70 K). This kind of SRO structure can be understood in terms of the ordering of insertion of fluorine and/or oxygen atoms located between the SrO(F) double layers. The most probable ordering scheme is proposed. The effects of Ca content on this kind of SRO state as well as other locally ordered states have also been investigated.

Dielectric and Ferroelectric Characterization of Sol-Gel Derived Ca-Doped PbTiO3 Thin Films

AbstractA series of sol-gel derived CaTiO3- PbTiO3 thin films ( i.e. Pb1−xCaxTiO3 with x = 0 − 1) was prepared on platinized Si substrates and fired to temperatures ranging from 550C to 650C. Multiple spincoating was performed to obtain films up to 0.5 μm thick with an intermediate firing of 400C between coatings. After the final crystallization firing, top Pt electrodes were sputtered to form monolithic capacitors. These capacitors were subjected to dielectric and ferroelectric characterization using an impedance analyzer and Radiant Technology RT66A Ferroelectric Test System. XRD was used to study the phase development and phase assembly of the fired films. All compositions were single perovskite phase after firing to 600C. The effects of Ca content on the crystallization behavior and ferroelectric properties are discussed.