Yozo Ohshima

Synthesis and crystal structure of (Sr1-xCax)2FeMnOy (x=0-1.0)

Abstract (Sr 1− x Ca x ) 2 FeMnO y ( x = 0–1.0) were synthesized in air at 1150–1200 °C and their crystal structures and electric properties investigated. The perovskite-type and the brownmillerite-type compounds were formed in the compositional range x = 0–0.7 and x = 0.8–1.0, respectively. Ca 2 FeMnO y ( x = 1.0) was the brownmillerite-type compound with lattice parameters a = 0.5338 nm, b = 1.4834 nm and c = −0.5515 nm. The angle of Fe-O-Mn was 151 ° calculated from the refined structure data of Ca 2 FeMnO y . It is indicated that the FeO 4 tetrahedra and the MnO 6 octahedra are alternately arranged zigzag along the b -axis. All samples exhibited p-type semiconducting behavior.

SS-MIX: a ministry project to promote standardized healthcare information exchange.

OBJECTIVES To promote healthcare information exchange between providers and to allow hospital information systems (HIS) export information in standardized format (HL7 and DICOM) in an environment of wide-spread legacy systems, which only can export data in proprietary format. METHODS Through the Shizuoka prefecture EMR project in 2004-2005, followed by the ministrys SS-MIX project, many software products have been provided, which consist of 1) a standardized storage to receive HL7 v2.5 messages of patient demographics, prescription orders, laboratory results, and diagnostic disease in ICD-10, 2) a referral letter creation system, 3) a formatted document creation system, 4) a progress note/nursing record system, and 5) an archive/viewer to incorporate incoming healthcare data CD and allow users to view on HIS terminal. Meanwhile, other useful applications have been produced, such as adverse event reporting and clinical information retrieval. To achieve the above-mentioned objectives, these software products were created and propagated, because users can use these software products, provided that their HIS can export the above information to the standardized storage in HL7 v2.5 format. RESULTS In 20 hospitals of Japan, the standardized storage has been installed and some applications have been used. As major HIS vendors are shipping HIS with HL7 export function since 2007, HIS of 594 hospitals in Japan became capable of exporting data in HL7 v2.5 format (as of March 2010). CONCLUSIONS In high CPOE installation rate (85% in 400+ bed hospitals), though most of them only capable of exporting data in proprietary format, prefecture and ministry projects were effective to promote healthcare information exchange between providers. The standardized storage became an infrastructure for many useful applications, and many hospitals started using them. Ministry designation of proposed healthcare standards was effective so as to allow vendors to conform their products, and users to install them.

Synthesis and crystal structure of Sr2−xLaxCuTaOy

Perovskite related solid solutions Sr2−xLaxCuTaOy (0 ⩽ x ⩽ 1.0) were synthesized by solid state reaction at 1050°C in air. Two types of crystal structure were observed in the Sr2−xLaxCuTaOy system: simple cubic perovskite-type (0 ⩽ x ⩽ 0.7) and tetragonally distorted (NH4)3FeF6-type (0.8 ⩽ x ⩽ 1.0). The average valency state of copper in these solid solutions was nearly equal to +2, which was determined by iodometric titration. A significant change of the cubic lattice parameter a was not observed, and the tetragonality (ca) increased with increasing La3+ content. An ordering of Cu2+ and Ta5+ on the B site and the tetragonal distortion are found to be related to the appearance of the Jahn-Teller effect of Cu2+.

Cation ordering in the perovskite-type Sr2−xLaxCo1−yTa1+yO6

Abstract Perovskite-related solid solutions, Sr 2− x La x Cu 1− y Ta 1+ y O z , were synthesized by solid-state reaction at 1200°C in air. The crystalline phases were identified by powder X-ray diffraction. The perovskite-type solid solutions with different ordering types were observed including simple cubic perovskite-type (random), the Ba(Sr 1/3 Ta 2/3 )O 3 -type (1:2 ordering) and the (NH 4 ) 3 FeF 6 -type (1:1 ordering). The 1:2 ordering phase formed near the Sr 2 (Co 0.67 Ta 1.33 )O 6 composition. In the composition range, 0≤ y ≤0.2, the random and the 1:1 ordered phases formed. In the higher La 3+ content region, the 1:1 ordering phase was observed. The valency state of Co decreased with increasing La 3+ content and the perovskite cell expanded resulting from the increase of the average ionic radii on (Co,Ta) site. The 1:1 ordering of the ions on the octahedral site was found to be affected by the size difference of the ions more than the charge difference in this system.

Distortion and cation ordering in LaSr(Ni1−xCux)TaO6

Abstract The perovskite-type solid solution LaSr(Ni 1− x Cu x )TaO 6 was synthesized and characterized by powder X-ray diffraction and iodometric titration. The stoichiometric solid solutions were synthesized at 1050–1100°C in air. The compounds for 0≤ x ≤0.6 have the (NH 4 ) 3 FeF 6 -type structure with ordering between (Ni 2+ , Cu 2+ ) and Ta 5+ . Tetragonal distorted (NH 4 ) 3 FeF 6 -type phases due to the Jahn-Teller effect formed in the compositional range, x ≥0.7 and the monoclinic distortion was observed for x =0.9 and 1.0. This result suggests that the tetragonal distortion occurs when the amount of Cu 2+ becomes more than 35% of the octahedral site in this system.

Synthesis and crystal structure of the oxygen defect perovskites containing copper and tantalum

Perovskite-related solid solutions, Sr 2-x La x Cu 1-y Ta 1+y O 2 , were synthesized by solid state reaction at 1050-1080°C in air. The crystalline phases were identified by powder X-ray diffraction. Three types of crystal structure were observed including simple cubic perovskite-type. tetragonal perovskite-type and tetragonally distorted (NH 4 ) 3 FeF 6 -type structure in which Cu 2+ and Ta 5+ were ordered alternatively. The average valency state of copper in these solid solutions was nearly equal to + 2. The tetragonal phases were observed in a compositional range, z ≥ 5.85, regardless of cation composition. The tetragonality (c/a) for both the perovskite-type and (NH 4 ) 3 FeF 6 -type phases increased with increasing oxygen content. Ordering between Cu 2+ and Ta 5+ was not observed in the Sr-rich composition. These facts suggest that oxygen content affects the appearance of the Jahn-Teller effect of Cu 2+ leading to the tetragonal distortion and that the cation on the A-site affects the ordering of the cation on the B-site.

Synthesis and electrical properties of (La1-xMx)3Ni2TaO9 (M=Ca, Sr)

Abstract Perovskite related compounds, (La 1− x M x ) 3 Ni 2 TaO 9 ( M = Ca , Sr ), were synthesized by the metal nitrate decomposition method. Single-phase solid solutions were obtained in the composition range 0⩽ x ⩽0.20 in both ( M = Ca , Sr ) systems. The crystal structure of the solid solutions is slightly distorted (NH 4 ) 3 FeF 6 -type structure. All the solid solutions exhibit p-type behavior with activation energies in the range from 0.13 to 0.22 eV. The value of the Seebeck coefficient of the solid solutions indicates the existence of hole carriers. The behavior of the compositional dependence of the unit cell volume indicates the presence of Ni 3+ ions.