Structure and magnetic properties of high-entropy honeycomb-layered A3Q2SbO6 (A = Li or Na; Q =
Vladimir B Nalbandyan1, Igor L Shukaev1, Yuri V Popov1
1Southern Federal University, Rostov-on-Don 344090, Russia. vbn@sfedu.ru.
Abstract:
Monoclinic layered Li3(CoNiCuMgZn)0.4SbO6 and Na3(CoNiCuMgZn)0.4SbO6 (A3Q2SbO6 for short) were prepared by solid-state reactions. The X-ray Rietveld refinement of both materials confirms their structural analogy with their monocation counterparts (space group C2/m), random mixing of the five cations and their honeycomb ordering with Sb(5+). The Li compound shows considerable Li/Q site inversion, much larger than that in Li3Cu2SbO6. Static (DC) and dynamic (AC) magnetic susceptibility and specific heat measurements indicate the absence of any magnetic order down to 2 K in Na3Q2SbO6, while Li3Q2SbO6 demonstrates spin-cluster glass behaviour below 5 K. The Mydosh parameter (K) characterizing the frequency (f) shift of the freezing temperature amounts to 0.05. Within the critical slowing down model, a glassy freezing temperature (Tg) of 4.1 K (at f → 0), a microscopic spin flipping time (τ0) of 10-10 s and a critical exponent (zν) of 10 were obtained.
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