Research output: Contribution to journal › Article › peer-review
Bismuth germanate as a perspective material for dielectric resonators in EPR spectroscopy. / Ivanov, Mikhail Y.; Nadolinny, Vladimir A.; Bagryanskaya, Elena G. et al.
In: Journal of Magnetic Resonance, Vol. 271, 01.10.2016, p. 83-89.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Bismuth germanate as a perspective material for dielectric resonators in EPR spectroscopy
AU - Ivanov, Mikhail Y.
AU - Nadolinny, Vladimir A.
AU - Bagryanskaya, Elena G.
AU - Grishin, Yuriy A.
AU - Fedin, Matvey V.
AU - Veber, Sergey L.
PY - 2016/10/1
Y1 - 2016/10/1
N2 - High purity bismuth germanate (Bi4(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, B1 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 BGO 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.
AB - High purity bismuth germanate (Bi4(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, B1 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 BGO 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.
KW - Bismuth germanate
KW - Dielectric resonators
KW - Electron paramagnetic resonance
KW - Filling factor
KW - Sensitivity enhancement
UR - http://www.scopus.com/inward/record.url?scp=84984645407&partnerID=8YFLogxK
U2 - 10.1016/j.jmr.2016.08.009
DO - 10.1016/j.jmr.2016.08.009
M3 - Article
AN - SCOPUS:84984645407
VL - 271
SP - 83
EP - 89
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
SN - 1090-7807
ER -
ID: 25616511