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Vivek Kumar, Manfred Reehuis, Andreas Hoser, Peter Adler, Claudia Felser
We have investigated the crystal and magnetic structure of Mn<sub>2</sub>PtPd alloy using powder X-ray and neutron diffraction experiments. This compound is believed to belong to the Heusler family having crystal symmetry I4/mmm (TiAl<sub>3</sub>-type). However, in this work we found that the Pd and Pt atoms are disordered and thus Mn<sub>2</sub>PtPd crystallizes in the L1<sub>0</sub> structure having P4/mmm symmetry (CuAu-I type) like MnPt and MnPd binary alloys...
May 22, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Thomas Beaney, Aletta E Schutte, Maciej Tomaszewski, Cono Ariti, Louise M Burrell, Rafael R Castillo, Fadi J Charchar, Albertino Damasceno, Ruan Kruger, Daniel T Lackland, Peter M Nilsson, Dorairaj Prabhakaran, Agustin J Ramirez, Markus P Schlaich, Jiguang Wang, Michael A Weber, Neil R Poulter
BACKGROUND: Increased blood pressure is the biggest contributor to the global burden of disease and mortality. Data suggest that less than half of the population with hypertension is aware of it. May Measurement Month was initiated to raise awareness of the importance of blood pressure and as a pragmatic interim solution to the shortfall in screening programmes. METHODS: This cross-sectional survey included volunteer adults (≥18 years) who ideally had not had their blood pressures measured in the past year...
May 16, 2018: Lancet Global Health
Guihua Gao, Shuo Li, Sijia Li, Liang Zhao, Ting Wang, Xiaohong Hou
A vortex-assisted membrane extraction (VA-ME) method based on several metal-organic framework mixed-matrix membranes (MOF-MMMs) was firstly developed and applied for the analysis of four estrogens in human urine. The MOF-MMMs, with high MOF loading (∼67 wt%), were prepared using a facile approach by embedding the MOFs in a polyvinylidene difluoride matrix. The method was suitable for a wide variety of MOF materials, and the incorporated MOFs retained their unique properties. Being model analytes, the estrogens became adsorbed on the MOFs in the vortex-stirred sample solutions and were subsequently desorbed in methanol and analyzed using high-performance liquid chromatography with fluorescence detection...
September 6, 2018: Analytica Chimica Acta
Jan Zubáč, Pavel Javorsky, Björn Fåk
We report on inelastic neutron scattering measurements of the antiferromagnetic NdPd<sub>5</sub>Al<sub>2</sub> compound. NdPd<sub>5</sub>Al<sub>2</sub> crystallizes in the tetragonal <i>I</i>4<i>/mmm</i> space group and exhibits a distinct uniaxial anisotropy due to crystal field effects. In this study, we have revealed the crystal field energy levels of NdPd<sub>5</sub>Al<sub>2</sub> composed of 5 Kramers doublets...
May 11, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Volodymyr Gvozdetskyi, Anatoliy Senyshyn, Roman Gladyshevskii, Viktor Hlukhyy
The crystal structure of CaFe4 Al8 was studied by X-ray single crystal and powder diffraction as well as high-resolution neutron powder diffraction. CaFe4 Al8 crystallizes with a tetragonal CeMn4 Al8 -type structure, an ordered variant of the ThMn12 -type (Pearson symbol tI26, space group I4/ mmm, a = 8.777(1), c = 5.077(1) Å). Similarly to the well-known A15-type superconductors, the structure of CaFe4 Al8 contains one-dimensional chains of d-metal atoms, which are parallel to the crystallographic fourfold axis...
May 8, 2018: Inorganic Chemistry
Yu Su, Yoshihiro Tsujimoto, Kotaro Fujii, Makoto Tatsuta, Kengo Oka, Masatomo Yashima, Hiraku Ogino, Kazunari Yamaura
We report the successful synthesis of three new Ruddlesden-Popper-type scandium oxychloride perovskites, Sr2 ScO3 Cl, Sr3 Sc2 O5 Cl2 , and Ba3 Sc2 O5 Cl2 , by conventional solid-state reaction. Small single crystals of Sr2 ScO3 Cl were obtained by a self-flux method, and the crystal structure was determined to belong to the tetragonal P4/ nmm space group ( a = 4.08066(14) Å, c = 14.1115(8) Å) by X-ray diffraction analysis. The scandium center forms a ScO5 Cl octahedron with ordered apical oxygen and chlorine anions...
April 19, 2018: Inorganic Chemistry
Junichi Ishida, Soshi Iimura, Hideo Hosono
New manganese arsenides CsMn4 As3 , RbMn4 As3 , and KMn4 As3 were synthesized by solid-state reaction. They consist of edge-sharing MnAs4 tetrahedra, which are a building block similar to those of Fe-based superconductors. CsMn4 As3 and RbMn4 As3 adopt the KCu4 S3 -type structure (tetragonal P4/ mmm space group, No. 123) with a Mn4 As3 double layer, while KMn4 As3 has the CaFe4 As3 -type structure (orthorhombic Pnma space group, No. 62) with a Mn4 As3 tunnel framework. The structural change from CsMn4 As3 and RbMn4 As3 to KMn4 As3 as well as the structural trend of the other ternary A-Mn-As (A = alkali metal) and AE-Mn-As (AE = alkaline-earth metal) compounds is understood as a consequence of reduction of the coordination number around the A and AE sites owing to the decrease of the ionic radius from Cs+ to Mg2+ ...
April 16, 2018: Inorganic Chemistry
Wenmin Li, Zhaoming Fu, Xiancheng Wang, Jun Zhang, Min Liu, Jianfa Zhao, Meiling Jin, Guoqiang Zhao, Guangyang Dai, Zheng Deng, Sijia Zhang, Shaomin Feng, Zhiwei Hu, Qingzhen Huang, Hongji Lin, Chien-Te Chen, Yifeng Yang, Changqing Jin
A new layered oxyselenide, Ba2 CuO2 Cu2 Se2 , was synthesized under high-pressure and high-temperature conditions and was characterized via structural, magnetic, and transport measurements. It crystallizes into space group I4/ mmm and consists of a square lattice of [CuO2 ] planes and antifluorite-type [Cu2 Se2 ] layers, which are alternately stacked along the c axis. The lattice parameters are obtained as a = b = 4.0885 Å and c = 19.6887 Å. The Cu-O bond length is given by half of the lattice constant a, i...
April 9, 2018: Inorganic Chemistry
Dmitrii Semenok, Alexander G Kvashnin, Ivan A Kruglov, Artem R Oganov
Stability of numerous unexpected actinium hydrides was predicted via evolutionary algorithm USPEX. Electron-phonon interaction was investigated for the hydrogen-richest and most symmetric phases: R3 ̅m-AcH10 , I4/mmm-AcH12 and P6 ̅m2-AcH16 . Predicted structures of actinium hydrides are consistent with all previously studied Ac-H phases and demonstrate phonon-mediated high-temperature superconductivity with TС in the range 204-251 K for R3 ̅m-AcH10 at 200 GPa and 199-241 K for P6 ̅m2-AcH16 at 150 GPa which was estimated by directly solving of Eliashberg equation...
March 28, 2018: Journal of Physical Chemistry Letters
Tatiana A Shestimerova, Natallia A Yelavik, Andrei V Mironov, Alexey N Kuznetsov, Mikhail A Bykov, Anastasia V Grigorieva, Valentina V Utochnikova, Leonid S Lepnev, Andrei V Shevelkov
We report the synthesis, crystal structures, and optical properties of two new compounds, K18 Bi8 I42 (I2 )0.5 ·14H2 O (1) and (NH4 )7 Bi3 I16 (I2 )0.5 ·4.5H2 O (2), as well as the electronic structure of the latter. They crystallize in tetragonal space group P4/ mmm with the unit cell parameters a = 12.974(1) and c = 20.821(3) Å for 1 and a = 13.061(3) and c = 15.162(7) Å for 2. Though 1 and 2 are not isomorphous, their crystal structures display the same structural organization; namely, the BiI6 octahedra are linked by I2 units to form disordered layers in 1 and perfectly ordered chains in 2...
March 22, 2018: Inorganic Chemistry
Abhishek Pandey, Saroj L Samal, David C Johnston
We report the synthesis and properties of a new layered tetragonal ternary compound CsMn4 As3 (structure type, KCu4 S3 ; space group, P4/ mmm, no. 123; and Z = 2). The material is a small band gap semiconductor and exhibits an antiferromagnetic ground state associated with Mn spins. The compound exhibits a signature of a distinct magnetic moment canting event at 150(5) K with a canting angle ≈ 0.3°. Although some features of the magnetic characteristics of this new compound are qualitatively similar to those of the related BaMn2 As2 , the underlying Mn sublattices of the two materials are quite different...
March 19, 2018: Inorganic Chemistry
Evgeniya A Ptashkina, Elizaveta G Kabanova, Anna I Tursina, Alexandr V Yatsenko, Victor N Kuznetsov
A new Cu3 Au-type ternary phase (τ phase) is found in the AuPd-rich part of the Au-In-Pd system. It has a broad homogeneity range based on extensive (Pd,Au) and (In,Au) replacement, with the composition varying between Au17.7 In25.3 Pd57.0 and Au50.8 In16.2 Pd33.0 . The occupancies of the crystallographic positions were studied by single-crystal X-ray diffraction for three samples of different composition. The sites with m-3m symmetry are occupied by atoms with a smaller scattering power than the atoms located on 4/mmm sites...
March 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Alexander Ovchinnikov, Svilen Bobev
The Ga- and In-substituted bismuthides Ca11 Gax Bi10-x , Ca11 Inx Bi10-x , Yb11 Gax Bi10-x , and Yb11 Inx Bi10-x (x < 2) can be readily synthesized employing molten Ga or In metals as fluxes. They crystallize in the tetragonal space group I4/mmm and adopt the Ho11 Ge10 structure type (Pearson code tI84; Wyckoff sequence n2 m j h2 e2 d). The structural response to the substitution of Bi with smaller and electron-poorer In or Ga has been studied by single-crystal X-ray diffraction methods for the case of Ca11 Inx Bi10-x [x = 1...
March 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Nicholas M Jacques, Peter R E Rought, Detlev Fritsch, Mathew Savage, Harry G W Godfrey, Lei Li, Tamoghna Mitra, Mark D Frogley, Gianfelice Cinque, Sihai Yang, Martin Schröder
The binding domains within a mixed matrix membrane (MMM) that is selective for CO2 comprising MFM-300(Al) and the polymer 6FDA-Durene-DABA have been established via in situ synchrotron IR microspectroscopy. The MOF crystals are fully accessible and play a critical role in the binding of CO2 , creating a selective pathway to promote permeation of CO2 within and through the MMM. This study reveals directly the molecular mechanism for the overall enhanced performance of this MMM in terms of permeability, solubility and selectivity for CO2 ...
March 15, 2018: Chemical Communications: Chem Comm
Cressa Ria P Fulong, Junyi Liu, Vincent J Pastore, Haiqing Lin, Timothy R Cook
Discrete metal-organic polyhedra (MOPs) containing copper(ii), palladium(ii), and iron(ii) nodes were synthesized as fillers for mixed-matrix materials (MMMs) with a polyvinylidine fluoride (PVDF) polymer phase and contrasted against an MMM containing a metal-organic framework, MOF-5. When a given MOP was soluble in the precursor solutions, the resulting MMMs were thin, flexible, and homogeneous based on microscopy and SEM imaging. Analogous MMM formation using either insoluble MOPs or the inherent insoluble MOF-5 showed a higher degree of phase separation and inhomogeneity...
February 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Kenji Kawashima, Shigeyuki Ishida, Hiroshi Fujihisa, Yoshito Gotoh, Kunihiro Kihou, Yoshiyuki Yoshida, Hiroshi Eisaki, Hiraku Ogino, Akira Iyo
We discovered novel Fe-based superconductors (FeSCs) (La,Na)AFe4 As4 , where A = Rb or Cs, and characterized their superconducting properties. (La,Na)AFe4 As4 is a so-called 1144-type compound with a tetragonal unit cell classified into space group P4/mmm (no. 123). The lattice constants are a = 3.861(1) Å and c = 13.26(1) Å for (La,Na)RbFe4 As4 and a = 3.880(1) Å and c = 13.60(1) Å for (La,Na)CsFe4 As4 . The Rietveld refinement results on the powder X-ray diffraction suggest that the La/Na ratio is rather fixed as La:Na = 0...
February 15, 2018: Journal of Physical Chemistry Letters
Tiglet Besara, Daniel C Ramirez, Jifeng Sun, Nathaniel W Falb, Wangwei Lan, Jennifer N Neu, Jeffrey B Whalen, David J Singh, Theo Siegrist
Single crystals of a new family of layered lanthanide oxychlorides, Ba3 Ln2 O5 Cl2 (Ln = Gd-Lu), have been synthesized from a molten barium flux. This family crystallizes in the space group I4/mmm (No. 139; Z = 2) with lattice parameters a = 4.3384(1)-4.4541(1) Å and c = 24.5108(7)-24.8448(9) Å. Ba3 Ln2 O5 Cl2 phases are built up of two different blocks: a perovskite double layer of stoichiometry Ba2 Ln2 O5 formed by corner-connected LnO5 tetragonal bipyramids and a puckered rock-salt-like interlayer of composition BaCl2 ...
February 19, 2018: Inorganic Chemistry
Laura Mezquita, Lucía Ruiz-Valero, Naiara Martínez-Gómez, Manuel I Ibáñez, Generós Ortet
Marijuana motives are a proximal variable to marijuana use. This research aimed to adapt and validate the short form of the Marijuana Motives Measure (MMM; Simons, Correia, Carey, y Borsari, 1998), the MMM SF, in Spanish.&nbsp; The sample comprised 232 participants (mean age = 25.11 (7.58), 50.43% males) who had tried marijuana at least once in their lifetime. Item and Rasch analyses were performed to choose the final pool of 15 items. Confirmatory Factor Analysis (CFA) showed an adequate 5-factor structure (S-BX2(80) = 121...
January 15, 2018: Adicciones
Josep Matali Costa, J Simons, M Pardo, M Lleras, A Pérez, O Andión
INTRODUCTION: Cannabis is the illicit drug mostly widely consumed by adolescents in Spain. The understanding of consumption motives is an important factor for intervention. In Spain, there are no available instruments for their evaluation, hence, the goal of this paper is to study the psychometric properties of the Marihuana Motives Measure (MMM) in a sample of adolescent consumers. MATERIAL AND METHOD: Firstly, translation and back-translation was performed. A total of 228 adolescent consumers of cannabis were evaluated...
January 15, 2018: Adicciones
Giovanni Di Teodoro, Giuseppe Marruchella, Andrea Di Provvido, Gianluca Orsini, Gaetano Federico Ronchi, Anna Rita D'Angelo, Nicola D'Alterio, Flavio Sacchini, Massimo Scacchia
Contagious bovine pleuropneumonia (CBPP) is a severe disease caused by Mycoplasma mycoides subsp. mycoides (Mmm). Knowledge on CBPP pathogenesis is fragmented and hampered by the limited availability of laboratory animal and in vitro models of investigation. The purpose of the present study is to assess respiratory explants as useful tools to study the early stages of CBPP. Explants were obtained from trachea, bronchi and lungs of slaughtered cattle, tested negative for Mycoplasma spp. and for the major bacterial and viral respiratory pathogens...
January 12, 2018: Veterinary Research
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