Open AccessDevelopment of an energy‐domain 57 Fe‐Mössbauer spectrometer using synchrotron radiation and its application to ultrahigh‐pressure studies with a diamond anvil cell
Author(s) -
Mitsui Takaya,
Hirao Naohisa,
Ohishi Yasuo,
Masuda Ryo,
Nakamura Yumiko,
Enoki Hirotoshi,
Sakaki Kouji,
Seto Makoto
Publication year - 2009
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049509033615
Subject(s) - spectrometer , synchrotron radiation , mössbauer spectroscopy , diamond anvil cell , materials science , crystallite , synchrotron , optics , high energy x rays , analytical chemistry (journal) , beamline , chemistry , physics , crystallography , diffraction , chromatography , metallurgy , beam (structure)
An energy‐domain 57 Fe‐Mössbauer spectrometer using synchrotron radiation (SR) with a diamond anvil cell (DAC) has been developed for ultrahigh‐pressure measurements. The main optical system consists of a single‐line pure nuclear Bragg reflection from an oscillating 57 FeBO 3 single crystal near the Néel temperature and an X‐ray focusing device. The developed spectrometer can filter the Doppler‐shifted single‐line 57 Fe‐Mössbauer radiation with a narrow bandwidth of neV order from a broadband SR source. The focused incident X‐rays make it easy to measure a small specimen in the DAC. The present paper introduces the design and performance of the SR 57 Fe‐Mössbauer spectrometer and its demonstrative applications including the newly discovered result of a pressure‐induced magnetic phase transition of polycrystalline 57 Fe 3 BO 6 and an unknown high‐pressure phase of Gd 57 Fe 2 alloy placed in a DAC under high pressures up to 302 GPa. The achievement of Mössbauer spectroscopy in the multimegabar range is of particular interest to researchers studying the nature of the Earth's core.