Variable pressure-temperature neutron diffraction of wüstite „Fe1−xO...: Absence of long-range magnetic order to 20 GPa

نویسندگان

  • Yang Ding
  • Jian Xu
  • Charles T. Prewitt
  • John A. Cowan
  • Jianzhong Zhang
  • Jiang Qian
  • Sven C. Vogel
  • Konstantin Lokshin
  • Yusheng Zhao
چکیده

Neutron diffraction measurements have been performed on polycrystalline Fe1−xO swüstited up to 20.3 GPa using a large-volume moissanite anvil cell at room temperature to examine the existence of long-range magnetic ordering in the high-pressure rhombohedral phase of the material. This investigation is crucial for understanding the nature of high-pressure phase transitions in Fe1−xO. Low temperature ambient pressure neutron diffraction measurements on the same sample were also conducted at 190, 180, and 85 K to compare with the high-pressure results. Magnetic peaks are expected to be observed under pressure similar to those at 180 K at ambient pressure. However, no magnetic peaks were evident in the high-pressure diffraction patterns sto 20.3 GPa at 300 Kd. The absence of magnetic peaks indicates the absence of long-range magnetic order in Fe1−xO under these conditions. This result indicates the need to reconsider the interpretation of high-pressure Mössbauer studies and the mechanism of the high-pressure phase transitions in Fe1−xO. © 2005 American Institute of Physics. fDOI: 10.1063/1.1852075g

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Zone-axis diffraction study of pressure-induced inhomogeneity in single-crystal Fe1−xO

A zone-axis synchrotron diffraction study of complex and inhomogeneous Fe1−xO thin single crystal under pressure is presented in this letter. Using this method, four phases are observed to coexist in a single crystal of Fe1−xO at 35 GPa in diamond-anvil cells. One phase has cubic symmetry, whereas the other three phases have not been reported previously and can be interpreted as either orthorho...

متن کامل

Lithium-induced conversion reaction in wüstite Fe1-xO studied by 57Fe Mössbauer spectroscopy

Fe1-xO wüstite as negative electrode material for Li-ion batteries has been studied. The aim of this work is to get a better understanding of the insertion mechanism involved during reduction/oxidation processes. Electrochemical tests have been done in Swagelock TM cells and shown a high specific capacity of 800 Ah/kg for the first discharge. X-ray diffraction and 57 Fe Mössbauer spectroscopy p...

متن کامل

Coexistence of incommensurate magnetism and superconductivity in Fe1+ySexTe1−x

We have studied the superconducting and magnetic properties of Fe1+ySexTe1−x single crystals (0≤x≤0.5) by magnetic susceptibility, muon-spin rotation, and neutron diffraction. We find three regimes of behavior: (i) commensurate magnetic order for x≲0.1, (ii) bulk superconductivity for x∼0.5, and (iii) a range x≈0.25-0.45 in which superconductivity coexists with incommensurate magnetic order. Th...

متن کامل

Pressure-induced magnetization in FeO: evidence from elasticity and Mössbauer spectroscopy.

The complete elastic tensor of Fe0.94O (wüstite) has been determined to 10 GPa using acoustic interferometry at GHz frequencies inside a diamond-anvil cell. The soft mode (C44) elastic constant of FeO is reduced by 20% over the experimental pressure range. An unusual discontinuity in the pressure derivatives of C11 and C12 at 4.7+/-0.2 GPa corresponds to the pressure at which the onset of a mag...

متن کامل

Ground state selection under pressure in the quantum pyrochlore magnet Yb2Ti2O7

A quantum spin liquid is a state of matter characterized by quantum entanglement and the absence of any broken symmetry. In condensed matter, the frustrated rare-earth pyrochlore magnets Ho2Ti2O7 and Dy2Ti2O7, so-called spin ices, exhibit a classical spin liquid state with fractionalized thermal excitations (magnetic monopoles). Evidence for a quantum spin ice, in which the magnetic monopoles b...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2005