Bismuth germanate as a perspective material for dielectric resonators in EPR spectroscopy

Bismuth germanate as a perspective material for dielectric resonators in EPR spectroscopy Full article

Journal

Journal of Magnetic Resonance
ISSN: 1090-7807

Output data

Year: 2016, Volume: 271, Pages: 83-89 Pages count : DOI: 10.1016/j.jmr.2016.08.009

Tags

Electron paramagnetic resonance; Dielectric resonators; Sensitivity enhancement; Bismuth germanate; Filling factor

Authors

Ivanov Mikhail Y. ^1,2 , Nadolinny Vladimir A. ³ , Bagryanskaya Elena G. ^2,4 , Grishin Yuriy A. ⁵ , Fedin Matvey V. ^1,2 , Veber Sergey L. ^1,2

Affiliations

1	(Данные Web of science) RAS, Int Tomog Ctr, SB, Novosibirsk 630090, Russia
2	(Данные Web of science) Novosibirsk State Univ, Novosibirsk 630090, Russia
3	(Данные Web of science) MS, Nikolaev Inst Inorgan Chem, SB, Novosibirsk 630090, Russia
4	(Данные Web of science) RAS, NN Vorozhtsov Novosibirsk Inst Organ Chem, SB, Novosibirsk 630090, Russia
5	(Данные Web of science) RAS, Voevodsky Inst Chem Kinet & Combust, SB, Novosibirsk 630090, Russia

High purity bismuth germanate (Bi-4(GeO4)(3), BGO) is proposed and implemented as an alternative material for dielectric EPR resonators. A significant improvement of the absolute sensitivity can be readily achieved by substituting the alumina insert (ring) by BGO-made one in commercially available X-band EPR probeheads. Four BGO dielectric inserts of 2, 3, 4 and 5 mm inner diameter (ID) were made for comparison with standard 5 mm inner diameter alumina insert. All inserts were introduced into commercial Bruker EPR resonator ER 4118X-MD-5W1, and their performance was investigated. The Q-values of empty resonators, B-1 saturation curves and continuous wave EPR spectra of DPPH (2,2-diphenyl-1-picrylhydrazyl) were measured and analyzed in a temperature range 6-300 K. BGO-made resonators were found superior in several important aspects. The background signals arising from BGO are much weaker compared to those of alumina at B = 0-0.6 T and T = 6-300 K; this is especially useful for measuring weak signals in the half-field region, as well as those near the central field. Moreover, mechanical properties of SG() allow easy fabrication of dielectric bodies having various shapes and sizes; in particular, small BGO resonators (e.g. ID = 2 or 3 mm) strongly enhance sensitivity for small samples due to increase of the filling factor. All these advantages have been also inspected in the pulse mode, proving that higher B1 fields and better filling factors can be achieved, contributing to the overall enhancement of the performance. (C) 2016 Elsevier Inc. All rights reserved.

Ivanov M.Y. , Nadolinny V.A. , Bagryanskaya E.G. , Grishin Y.A. , Fedin M.V. , Veber S.L.
Bismuth germanate as a perspective material for dielectric resonators in EPR spectroscopy
Journal of Magnetic Resonance. 2016. V.271. P.83-89. DOI: 10.1016/j.jmr.2016.08.009 WOS Scopus РИНЦ

Published print:

Oct 1, 2016

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