Study of Tricalcium Phosphate Ceramics Doped with Gadolinium Ions with Various EPR Techniques
نویسندگان
چکیده
Tricalcium phosphate (TCP)-based materials, such as ?-Ca3(PO4)2 doped with rare earth ions (RE), have shown applications biomaterials, lighting emitting scintillating in vivo imaging probes, and thermoluminescent dosimeters. Their properties are found to be dependent on the distribution of RE3+ Ca2+ sites that can controlled by pulsed electron paramagnetic resonance (EPR) spin echo envelop modulation (ESEEM) experiments. The main spectroscopic parameters (spin Hamiltonian values) Gd3+ nitrogen impurity centers quantitatively determined (g-factor, fine structure D E, hyperfine constants A) well dynamic characteristics: spin–lattice T1 spin–spin T2 relaxation times. Based analysis EPR datasets, interatomic distance between 31P was estimated dipole–dipole approximation. Two structurally nonequivalent positions ?-TCP been identified. obtained valuable results demonstrate applicability modern techniques characterize Gd-TCP systems despite powder material high S = 7/2 ions.
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ژورنال
عنوان ژورنال: Ceramics
سال: 2022
ISSN: ['2571-6131']
DOI: https://doi.org/10.3390/ceramics5040081