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1985 model 172p v speeds full#
Full magnetic hyperfine splitting with a hyperfine field of 25.0(2) T is observed at 6 K in the magnetically ordered regime. EuGa 5 Pt 3 shows a single signal at 78 K with an isomer shift of −9.89(4) mm s −1. The divalent ground state of europium is confirmed by 151 Eu Mössbauer spectroscopy. Antiferromagnetic ordering sets in at T N = 8.5(1) K. EuGa 5 Pt 3 behaves like a Curie–Weiss paramagnet above 50 K with an experimental magnetic moment of 8.17(1) µ B /Eu atom, indicating divalent europium. Temperature dependent magnetic susceptibility measurements indicate diamagnetism for CaGa 5 Pt 3 and isotypic BaGa 5 Pt 3. The Ga–Pt distances within the network range from 249 to 271 pm, emphasizing the covalent bonding character. The gallium and platinum atoms build up a three-dimensional 2− polyanionic network in which the europium atoms fill slightly distorted hexagonal prismatic voids. The structure of EuGa 5 Pt 3 was refined from single crystal X-ray diffractometer data: w R 2 = 0.0443, 1063 F 2 values and 56 variables. CaGa 5 Pt 3 and EuGa 5 Pt 3 are isotypic with CeAl 5 Pt 3 and isopointal with the YNi 5 Si 3 type intermetallic phases (space group Pnma, oP 36 and Wyckoff sequence c 9 ). The temperature dependency of some selective Raman modes further complements the findings, showing softening and hardening of the phonons across the phase transitions. The specific heat capacity exhibits distinct cusp, supporting the λ -type second-order phase transition. The Pbcn into Pna 2 1 phase transitions are complemented by the signals of the temperature-dependent second harmonic generation. At ambient conditions, both compounds crystallize in the non-centrosymmetric Pna 2 1 space group and undergo phase transitions to the centrosymmetric Pbcn space group at elevated temperatures. The compounds are thoroughly characterized using temperature-dependent single crystal and powder X-ray diffraction, heat capacity measurements, second harmonic generation experiments and Raman spectroscopy.
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The corresponding polycrystalline powder samples are synthesized by conventional solid-state approach. Pb 2 Sc 2 Si 2 O 9 and Pb 2 In 2 Si 2 O 9, respectively, the scandium and indium containing structural analogues of the mineral kentrolite are grown by spontaneous crystallization from a PbO flux.
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