DN-12 time-of-flight high-pressure neutron spectrometer for investigation of microsamples

Аксенов, В. Л.; Балагуров, А.М.; Глазков, В. П.; Козленко, Д. П.; Naumov, I. V.; Савенко, Б. Н.; Sheptyakov, Denis; Соменков, В. А.; Bulkin, A.P.; Kudryashev, V.A.; Trounov, V.

doi:10.1016/s0921-4526(98)01392-1

Cited by 93 publications

(19 citation statements)

References 11 publications

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“…Neutron powder diffraction measurements at high pressures up to 6.4 GPa were performed at selected temperatures in the range of 10-290 K with the DN-12 spectrometer [27] at the IBR-2 high-flux pulsed reactor [Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research (JINR), Dubna, Russia]. The sample with a volume of ß2 mm 3 was loaded into the sapphire anvil high-pressure cell [28].…”

Section: Methodsmentioning

confidence: 99%

Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

et al. 2014

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The structural, magnetic, and vibrational properties of PbFe 0.5 Nb 0.5 O 3 relaxor multiferroic have been studied by means of x-ray, neutron powder diffraction, and Raman spectroscopy at pressures up to 30 GPa. Two successive structural phase transitions from the initial R3m polar phase to Cm and Pm monoclinic polar phases were observed at P = 5.5 and 8.5 GPa. Both transitions are associated with anomalies in pressure behavior of several stretching and bending modes of oxygen octahedra as well as Fe/Nb localized vibrational modes. The G-type antiferromagnetic order remains stable upon compression up to 6.4 GPa, assuming possible multiferroic properties of pressure-induced phases. The Néel temperature increases with a pressure coefficient (1/T N )dT N /dP = 0.012 GPa −1 . The observed pressure-induced phenomena in PbFe 0.5 Nb 0.5 O 3 are in drastic contrast with conventional multiferroics, exhibiting a general tendency towards a suppression of polar phases and/or magnetoelectric coupling under pressure.

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Section: Methodsmentioning

confidence: 99%

Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

et al. 2014

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“…The neutron powder diffraction measurements at pressures up to 11 GPa were performed at selected temperatures in the range 4-290 K with DN-12 [17] and DN-6 diffractometers (IBR-2 pulsed reactor, Joint Institute for Nuclear Research [JINR], Russia). A sample with a volume of about 2 mm 3 was loaded into the sapphire anvil high-pressure cell [18].…”

Section: Experimental and Computational Detailsmentioning

confidence: 99%

Anomalous lattice compression and magnetic ordering in CuO at high pressures: A structural study and first-principles calculations

et al. 2017

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The structural and magnetic properties of multiferroic CuO have been studied by means of neutron and x-ray powder diffraction at pressures up to 11 and 38 GPa, respectively, and by first-principles theoretical calculations. Anomalous lattice compression is observed, with enlargement of the lattice parameter a, reaching a maximum at P = 13 GPa, followed by its reduction at higher pressures. The lattice distortion of the monoclinic structure at high pressures is accompanied by a progressive change of the oxygen coordination around Cu atoms from the square fourfold towards the octahedral sixfold coordination. The pressure-induced evolution of the structural properties and electronic structure of CuO was successfully elucidated in the framework of full-electronic density functional theory calculations with range-separated HSE06, and meta-generalized gradient approximation hybrid M06 functionals. The antiferromagnetic (AFM) ground state with a propagation vector q = (0.5,0, − 0.5) remains stable in the studied pressure range. From the obtained structural parameters, the pressure dependencies of the principal superexchange magnetic interactions were analyzed, and the pressure behavior of the Néel temperature as well as the magnetic transition temperature from the intermediate incommensurate AFM multiferroic state to the commensurate AFM ground state were evaluated. The estimated upper limit of the Néel temperature at P = 38 GPa is about 260 K, not supporting the previously predicted existence of the multiferroic phase at room temperature and high pressure.

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“…Experiments on neutron diffraction at high pressures up to 2.0 GPa and in the temperature range 10-293 K were performed on a DN-12 spectrometer [7] that was linked with the IBR-2 high-flux reactor (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia) and that used highpressure cells with sapphire anvils [8]. The low-temperature measurements were performed with a special cryostat based on a close cycle refrigerator.…”

Section: Reo 4 -mentioning

confidence: 99%

Structural phase transitions in pyridinium perrhenate at high pressure

Кичанов¹,

Козленко²,

Wąsicki³

et al. 2008

Journal of Molecular Structure

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-The structure of deuterated pyridinium perrhenate (d 5 PyH)ReO 4 ( C 5 D 5 NHReO 4 ) is studied by X-ray diffraction at room temperature and pressures up to 3.5 GPa and by neutron diffraction in the temperature range 10-293 K and at pressures up to 2.0 GPa. Under normal conditions, this compound belongs to the orthorhombic space group Cmc 2 1 (ferroelectric phase II). At room temperature and pressures above P > 0.7 GPa, a transition to an orthorhombic phase (paraelectric phase II) is observed. This paraelectric phase is described by the space group Cmcm . At a pressure as high as P = 2.0 GPa, phase I remains stable at temperatures down to 10 K. This fact indicates that the high pressure suppresses the ferroelectric state in deuterated pyridinium perrhenate (d 5 PyH)ReO 4 .

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DN-12 time-of-flight high-pressure neutron spectrometer for investigation of microsamples

Cited by 93 publications

References 11 publications

Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

Pressure-induced polar phases in relaxor multiferroicPbFe0.5Nb0.5O3<

Anomalous lattice compression and magnetic ordering in CuO at high pressures: A structural study and first-principles calculations

Structural phase transitions in pyridinium perrhenate at high pressure

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