X-ray diffraction and electron microscopy studies of the room-temperature structure of Cu<sub>2</sub>Se

Kashida, Shoji; Akai, Junji

doi:10.1088/0022-3719/21/31/004

Cited by 76 publications

(67 citation statements)

References 10 publications

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“…We also found the lower intensity peaks at q = 1/4 ( 1, 1, 1) and q = 1/2 (2, 0, 0). These satellites are in general agreement with observation of q = 1/8 (1, 1, 1) and q = 1/3 (0, 2, 2) reflections by Kashida and Akai in the low temperature -phase of Cu 2 Se at ambient temperature [12][13]. Note that the strongest superstructural reflections are located at the BZ boundaries or close to them.…”

Section: First Experiments On Taipansupporting

confidence: 91%

“…At room temperature the superionic -phase exists in the concentration range from = 0.15 to 0.25 [11]. The characteristic structural features of copper selenide are the ordering of Cu atoms in the low-temperature phase and a random distribution of Cu over interstitial sites in high-temperature superionic phase [12][13]. However we observed that superstructure reflections in the Cu 1.8 Se compound appear at a temperature ~ 40 K above the α -β transition temperature; which is slightly below 300K for this composition [14].…”

Section: First Experiments On Taipanmentioning

confidence: 99%

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TAIPAN: First Results from the Thermal Triple-axis Spectrometer at OPAL Research Reactor

Danilkin

Yethiraj

Saerbeck

et al. 2012

J. Phys.: Conf. Ser.

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Abstract. The thermal triple-axis spectrometer TAIPAN is the first instrument for inelastic neutron scattering at the new Australian research reactor OPAL. TAIPAN started operation in February 2009 and is in full user service since November 2010. Conceptually, it is similar to the triple-axis spectrometers IN8 (ILL) and PANDA (FRM-II) with variable incident and final energies and a secondary spectrometer with a single detector. The instrument can be operated either in a high flux mode with a double-focusing monochromator and analyser, or with Soller collimators -gaining resolution at the expense of intensity. Presently the PG (002) doublefocusing monochromator and analyser are in use. The incident energy range on the TAIPAN TAS is from ~5 meV up to ~100 meV with neutron flux at sample position of 2.4 10 7 n/cm /s at incident energy of 14.8 meV. First experiments were performed with superionic conductor Cu 2-δ Se. The measurements reveal the presence of a soft mode related to ordering of Cu atoms followed by α -β phase transition at a lower temperature. The evolution of the magnetic structure with temperature in a magnetically modulated FePt 3 thin film was investigated in the diffraction mode of TAIPAN. The results show that the film fabricated by modulation of the chemical order parameter consists of a magnetic FM/AFM superlattice in single-crystalline FePt 3 . The spin wave and phonon dispersion was recently investigated in TbVO 3 single crystal. The acoustic and optical magnon branches were observed in the same energy range. This indicates that the 'orbital Peiers state' also exists in TbVO 3 .

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Section: First Experiments On Taipansupporting

confidence: 91%

Section: First Experiments On Taipanmentioning

confidence: 99%

TAIPAN: First Results from the Thermal Triple-axis Spectrometer at OPAL Research Reactor

Danilkin

Yethiraj

Saerbeck

et al. 2012

J. Phys.: Conf. Ser.

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“…The Cu 2Àd Se samples were synthesised using the method outlined by Kashida and Akai for Cu 2 Se [4]. Stoichiometric quantities of Cu (δ=0.02, 0.10, 0.15 and 0.25) and Se were placed in quartz tubes which were then sealed under vacuum.…”

Section: Methodsmentioning

confidence: 99%

“…The mixed ionic-electronic conductor Cu 2Àd Se received attention in particular due to a high ionic conductivity [1][2][3]. However until now the crystal structure and mechanism of ionic transport in Cu 2Àd Se compounds is the subject of discussion [4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Neutron scattering study of short-range correlations and ionic diffusion in copper selenide

Danilkin

Avdeev

Sakuma

et al. 2010

Ionics

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The paper reports the results of a neutron scattering study of Cu 2Àd Se superionic compounds. The crystallographic model fitted to the diffraction data shows the occupation of 8c and 32f sites by Cu atoms. Observed diffuse background is related to correlated thermal vibrations of Se and Cu atoms, with Se↔Cu (8c,32f) and Cu (8c)↔Cu (8c) correlations being most important. The quasi-elastic neutron experiments show the decrease of the self-diffusion coefficient with the deviation from the stoichiometry due to the longer residence time of Cu ions between diffusion hops. Combination of neutron diffraction, diffuse scattering and quasi-elastic scattering experimental data suggests that the Cu atoms diffuse between the nearest 8c sites through the 32f sites.

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Chalcogen-Bridged Copper Clusters

Dehnen

Eichhöfer²,

Fenske

2002

Eur. J. Inorg. Chem.

174

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Keywords: Copper / Sulfur / Selenium / Tellurium / ClustersThe investigation of coinage metal molecular clusters bridged by chalcogen atoms represents an area of ever increasing activity in recent chemical and material science research. This is largely due to the relatively high ionic and even higher electric conductivity of binary coinage metal chalcogenides, which leads to properties intermediate between those of semiconducting and metallic phases. In addition, the size-dependency of the chemical, physical, and structural properties of substances on going from small molecules to bulk materials is of general interest. Approaches towards the synthesis and investigation of such clusters have included the study of colloidal nanoparticles with a narrow size distribution, as well as the formation and isolation of [a] ϩ49 (0)7247/82-6368 Andreas Eichhöfer (left) was born in Hünfeld, Germany, in 1964. He received his diploma in 1991, and subsequently graduated in 1993 in the group of Prof. D. Fenske at the university of Karlsruhe with a doctoral degree on metal-phosphorous cluster complexes. He then moved to the group of Prof. G. Fritz at the same institute to work on carbosilanes as precursor compounds for the fabrication of SiC fibers. After that he returned to his previous group and became a research scientist at the Institute of Nanotechnology at the Forschungszentrum Karlsruhe in 1999, where he is currently investigating the syntheses and properties of semiconductor cluster compounds. Stefanie Dehnen (center) was born in Gelnhausen, Germany, in 1969. She obtained her diploma from the University of Karlsruhe in 1993 and her doctoral degree in 1996 under the supervision of Prof. D. Fenske on experimental and theoretical investigations of copper sulfide and copper selenide clusters. After a postdoctoral stay with Prof. R. Ahlrichs (1997) she returned to the inorganic chemistry department at the University of Karlsruhe where she is presently preparing her Habilitation. In 1997, she was awarded a Feodor-Lynen-Stipendium of the Alexander-von-Humboldt-Stiftung, and in 1998, she received a Margarete-von-Wrangell-Habilitations-Stipendium of the state of Baden-Württemberg. Her current research interests comprise the synthesis, structural elucidation and chemical reactivity of binary or ternary polyanions of main group elements. Dieter Fenske (right) was born in Dortmund, Germany, in 1942. He studied chemistry at the University of Münster where he also received his doctoral degree in 1973 with Prof. H. J. Becher. After the completion MICROREVIEWS: This feature introduces the readers to the authors' research through a concise overview of the selected topic. Reference to important work from others in the field is included.

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X-ray diffraction and electron microscopy studies of the room-temperature structure of Cu₂Se

Cited by 76 publications

References 10 publications

TAIPAN: First Results from the Thermal Triple-axis Spectrometer at OPAL Research Reactor

TAIPAN: First Results from the Thermal Triple-axis Spectrometer at OPAL Research Reactor

Neutron scattering study of short-range correlations and ionic diffusion in copper selenide

Chalcogen-Bridged Copper Clusters

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X-ray diffraction and electron microscopy studies of the room-temperature structure of Cu2Se

Cited by 76 publications

References 10 publications

TAIPAN: First Results from the Thermal Triple-axis Spectrometer at OPAL Research Reactor

TAIPAN: First Results from the Thermal Triple-axis Spectrometer at OPAL Research Reactor

Neutron scattering study of short-range correlations and ionic diffusion in copper selenide

Chalcogen-Bridged Copper Clusters

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Product

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X-ray diffraction and electron microscopy studies of the room-temperature structure of Cu₂Se