Magnetic properties of gadolinium-doped β-tricalcium phosphate

Abstract

The frequency of radiant energy used in the majority of electron spin resonance (ESR) spectrometers is approximately 9 GHz (X-band), in the medium-frequency microwave region. Recently, high frequency microwave (Q-band) has been used to measure ESR spectra because high frequency ESR enhances the sensitivity. In the present work, ESR spectra (X-band, Q-band) of gadolinium-doped β-tricalcium phosphate (β-Ca 3(PO 4) 2:Gd, β-TCP:Gd) were investigated. X-band and Q-band ESR spectra were recorded. Q-band ESR spectra was observed clearer than X-band ESR spectra. The ESR spectra were assigned to the typical fine structure of the Gd 3+ ion. The crystal-field parameters obtained at room temperature were determined to be b 2 0 = − 267.0 , b 4 0 = − 1.5 , and b 6 0 = − 6.4 c m − 1 .