The ECHIDNA high-resolution neutron powder diffractometer at the 20 MW OPAL research reactor in Australia produces high-quality data for a broad spectrum of crystal and magnetic structural studies. paper presents an overview current status hardware, latest developments data-reduction software, statistics on instrument usage user programme, limitations.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNew Perovskite-Related Structure Family of Oxide-Ion Conducting Materials NdBaInO4Kotaro Fujii†, Yuichi Esaki‡, Kazuki Omoto§, Masatomo Yashima†*, Akinori Hoshikawa∥, Toru Ishigaki∥, and James R. Hester⊥View Author Information† †Department Chemistry Science, Graduate School Science Engineering, ‡Department Chemistry, §Department Interdisciplinary Tokyo Institute Technology, 2-12-1-W4-17, O-okayama, Meguro-ku, 152-8551, Japan∥ Frontier...

For the development of proton-based electrolytes, high proton conductivity at intermediate temperatures (300-600 °C) is crucial, but available materials have been confined to a limited number structure families, such as cubic perovskites. Herein, we report Ba5Er2Al2ZrO13, hexagonal perovskite-related oxide, new class conductors exhibiting higher conductivities than 10-3 S cm-1 between 300 and 1200 °C. The protons charge carriers are found exist in inherently oxygen-deficient h' layer which...

We prepared a new two-dimensional oxyantimonide, BaTi 2 Sb O, which shows superconducting transition at 1.2 K, representing the first superconductivity in system with Ti 3+ ( d 1 ) square lattice. The TiO 4 mixed anionic coordination stabilizes unique half-filled x y orbital configuration O plane, is analogous to Cu 2+ 9 high- T c superconductors. A charge density wave (CDW)- or spin (SDW)-like anomaly appears 50 significantly reduced compared 200 K for isostructural and non-superconducting As O.

We report a novel oxyhydride SrCrO2H directly synthesized by high-pressure high-temperature method. Powder neutron and synchrotron X-ray diffraction revealed that this compound adopts the ideal cubic perovskite structure (Pm3̄m) with O(2-)/H(-) disorder. Surprisingly, despite non-bonding nature between Cr 3d t(2g) orbitals H 1s orbital, it exhibits G-type spin ordering at T(N)≈380 K, which is higher than of RCrO3 (R=rare earth) any chromium oxides. The enhanced T(N) in four Cr-O-Cr bonds...

Multiferroic materials have been the subject of intense study, but it remains a great challenge to synthesize those presenting both magnetic and ferroelectric polarizations at room temperature. In this work, we successfully obtained LiNbO3-type ScFeO3, metastable phase converted from orthorhombic perovskite formed under 15 GPa elevated temperatures. A combined structure analysis by synchrotron X-ray neutron powder diffraction high-angle annular dark-field scanning transmission electron...

The oxyhydride solid solutions (Ca,Sr)TiO(3-x)H(x) and (Sr,Ba)TiO(3-x)H(x) have been prepared by reducing the corresponding ATiO(3) oxides with calcium hydride. Under reaction conditions examined, a hydride content of x = 0.1-0.3 was obtained for all compositions. Compared to our previous result BaTiO(3-x)H(x), larger particle size in this study (20-30 μm vs 170 nm) resulted somewhat lower amount despite prolonged times. We examined changes cell volume, octahedral tilt angle, site occupancy...

Double-perovskite Bi oxides are a new series of superconducting materials, and their crystal structure properties under investigation. In this paper, we describe the synthesis characterization double-perovskite material that has an increased superconductive transition temperature 31.5 K. The was examined using powder neutron diffraction (ND), synchrotron X-ray (SXRD), transmission electron microscopy (TEM). Rietveld refinement sample based on ND SXRD data confirmed A-site-ordered...

Oxide-ion and proton conductors have found diverse applications such as in electrolytes of solid-oxide, proton-conducting, hybrid-ion fuel cells. Research cells with higher energy efficiency at lower operating temperature has stimulated the search for ion improved understanding ion-diffusion mechanism. Ion conduction hexagonal perovskite-related materials is rare, mechanism diffusion unclear. Herein, we report high oxide-ion conductivity (bulk conductivities wet air: 11 2.7 mS cm–1 537 326...

The crystal structure of ${\mathrm{SrRuO}}_{3}$ at high temperatures has been studied fine temperature intervals using high-resolution synchrotron diffraction. It shown that ${\mathrm{SrRuO}}_{3},$ orthorhombic in space group Pnma, room temperature, changes by a continuous transition to Imma about 685 K, then discontinuous transformation tetragonal $I4/mcm$ 825 and finally, continuously, cubic near 950 K.

We have recently reported the \(d^{1}\) square-lattice compound BaTi2Sb2O, which shows superconductivity at \(T_{\text{c}} = 1.2\) K coexisting with a charge- or spin-density wave (CDW/SDW) state. Here, we successfully prepared two new oxybismuthides, BaTi2Bi2O and (SrF)2Ti2Bi2O, as first Pn Bi compounds in \(A\)Ti2 2O family. The CDW/SDW state disappeared for both compounds, presumably owing to considerable interaction between Ti-\(3d\) Bi-\(6s\) orbitals. complete suppression of...

The effect of cation valency on the complex structures divalent and trivalent transition metal gallates has been examined using a combination neutron synchrotron X-ray powder diffraction, single-crystal diffraction XANES spectroscopy. In frameworks, M(C7H4O5)·2H2O (M = Mn, Co Ni), it was found that charge balance achieved via presence protons meta-hydroxyl groups. It also established these compounds undergo discontinuous phase at lower temperatures, which is driven by position...

The crystal structures of the series ordered double perovskites Ba(2-x)Sr(x)YIrO6 (0 ≤ x 2) were refined using a combination high-resolution synchrotron X-ray and high-intensity neutron diffraction data. materials displayed sequence Fm3̅m(a(0)a(0)a(0)) (x = 0.6)--> I4/m(a(0)a(0)c(-)) 1.0)--> I2/m(a(-)a(-)c(0)) 1.4)--> P2(1)/n(a(-)a(-)c(+)) associated with increased tilting corner-sharing octahedra induced by increasing amount smaller Sr cation present. A similar transitions was heating...

The synthesis, structure, and magnetic properties of a polar oxynitride MnTaO2N are reported. High-pressure synthesis at 6 GPa 1400 °C allows for the stabilization high-density structure containing middle-to-late transition metals. Synchrotron X-ray neutron diffraction studies revealed that adopts LiNbO3-type with random distribution O(2-) N(3-) anions. an "orbital-inactive" Mn(2+) ion (d(5); S=5/2) exhibits nontrivial helical spin order 25 K propagation vector [0,0,δ] (δ≈0.3), which is...

Version 2.0 of the CIF format incorporates novel features implemented in STAR 2.0. Among these are an expanded character repertoire, new and more flexible forms for quoted data values, compound types. The is compared with both 1.1 2.0, a formal syntax specification provided.

K2NiF4-type LaSrAlO4 and Sr2TiO4 exhibit anisotropic isotropic thermal expansion, respectively; however, their structural origin is unknown. To address this unresolved issue, the crystal structure expansion of have been investigated through high-temperature neutron synchrotron X-ray powder diffraction experiments ab initio electronic calculations. The coefficient (TEC) along c-axis (αc) being higher than that a-axis (αa) [αc = 1.882(4)αa] mainly ascribed to TEC interatomic distance between...

Solid oxide-ion conductors are crucial for enabling clean and efficient energy devices such as solid oxide fuel cells. Hexagonal perovskite-related oxides have been placed at the forefront of high-performance conductors, with Ba7 Nb4-x Mo1+x O20+x/2 (x = 0-0.1) being an archetypal example. Herein, high conductivity stability under reducing conditions in Ta3.7 Mo1.3 O20.15 reported by investigating solutions Ta4-x 0.2-0.7). Neutron diffraction indicates a large number interstitial ions ,...

Hexagonal perovskite-related oxides have garnered a great deal of research interest because their high oxide-ion conductivity at intermediate temperatures, with Ba7Nb4MoO20 being notable example. However, concomitant proton conduction in may cause decrease power efficiency when used as the electrolyte conventional solid oxide fuel cells. Here, through investigations transport and structural properties Ba7Nb4-xWxMoO20+x/2 (x = 0-0.25), we show that aliovalent substitution Nb5+ by W6+ not only...

Abstract The high‐pressure synthesis of a manganese oxyhydride LaSrMnO 3.3 H 0.7 is reported. Neutron and X‐ray Rietveld analyses showed that this compound adopts the K 2 NiF 4 structure with hydride ions positioned exclusively at equatorial site. This result makes striking contrast to topochemical reductions in only oxygen‐deficient phases down 3.5 . suggests high pressure plays key role stabilizing phase, offering an opportunity synthesize other transition‐metal oxyhydrides. Magnetic...

Hexagonal perovskite derivatives Ba3MNbO8.5 (M: W and Mo) are attracting much interest due to high oxide-ion conductivity potential use for many applications. This work shows the electrical conductivities of Ba3WNbO8.5 (3.7 × 10–2 S cm–1) Ba3MoNbO8.5 (8.8 at 900 °C confirms higher activation energy than that Ba3MoNbO8.5. Key factors governing ratio tetrahedral O3 octahedral O2 oxide ions diffusion pathways in Ba3MNbO8.5. However, O2/O3 disorders paths unresolved important issues Here,...

Oxide-ion conductors based on hexagonal perovskite-related oxide Ba7Nb4MoO20 have attracted much attention due to high oxide-ion and proton conductivities potential applications in many electrochemical devices such as solid fuel cells (SOFCs). Herein, we report simultaneous improvement of conductivity suppression by Cr6+ doping Ba7Nb4MoO20. New materials Ba7Nb4−xCrxMoO20+x/2 (x = 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5) were synthesized. It was found that Ba7Nb3.8Cr0.2MoO20.1−δ...

Abstract Proton conductors are promising materials for clean energy, but most available exhibit sufficient conductivity only when chemically substituted to create oxygen vacancies, which often leads difficulty in sample preparation and chemical instability. Recently, proton based on hexagonal perovskite‐related oxides have been attracting attention as they high even without the substitutions. However, their conduction mechanism has elusive so far. Herein, taking three types of with different...