A study of low energy magnetic excitations in terbium metaphosphate glass

Structure of rare-earth phosphate glasses by X-ray and neutron diffraction

“…(The decrease of r RR by $0.04 nm can be explained by the decrease of r RO by $0.02 nm if R is changed from La to Yb.) Thus, experimental indications for the most frequent first-neighbor R-R distances are found in Q-space and in real space ( [5,9,27,30], this work) of diffraction results.…”

“…The relation between a first-neighbor R-R distance and the position Q 1 of a first scattering peak of a disordered system given with Q 1 = $7.7/r RR justifies this interpretation [45,46]. The S TbTb (Q) factor of a Tb metaphosphate glass extracted by contrast variation using the magnetic neutron scattering [5] shows a first peak at 12.5 nm À1 , as well. (Different from this the S RR (Q) factor obtained by isomorphic substitution shows two peak components where the first is found at $12.5 nm À1 [30].)…”

“…Interesting low temperature properties were reported for several of these materials [2][3][4][5]. The structure of binary rare-earth phosphate glasses has been a topic of numerous investigations during the last 10 years.…”

Rare-earth site distributions in R(PO3)3(R = La,Nd,Er,Yb) metaphosphate glasses by reverse Monte Carlo simulations

“…A first large distance peak in the g RR (r ) function at ∼0.56 nm, indicating 7.9 neighbours, was found by neutron diffraction (ND) with isomorphic substitution of Dy by Ho [2,3]. The Tb-Tb correlations of a Tb metaphosphate glass (x ∼ = 0.25) were extracted by the magnetic scattering fraction of neutrons scattered on the paramagnetic Tb sites [4]. Tb-Tb distances of ∼0.6 nm were estimated from the position of the first scattering peak in the S TbTb (Q) structure factor.…”

“…Numerous spectroscopic studies as reviewed [16] have shown that these PO 4 Table 2. These parameters are introduced to suppress unreasonable short-range structures.…”