Structure and magnetic properties of high-entropy honeycomb layered A3Q2SbO6 (A = Li or Na; Q = Co1/5 Ni1/5Cu1/5 Mg1/5Zn1/5)

Авторы: Nalbandyan Vladimir B., Shukaev Igor L., Popov Yuri, Vasiliev Alexander, Vasilchikova Tatyana M.
Журнал: Dalton Transactions
Год издания: 2025
Издательство: Royal Society of Chemistry
Местоположение издательства: United Kingdom
DOI: 10.1039/d5dt01771h
Аннотация: Monoclinic layered Li3(CoNiCuMgZn)0.4SbO6 and Na3(CoNiCuMgZn)0.4SbO6 (A3Q2SbO6 for short) have been prepared by solidstate 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 in Li3Cu2SbO6 . Static (DC) and dynamic (AC) magnetic susceptibility along with specific heat measurements indicate 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, the values of glassy freezing temperature T g = 4.1 K (at f → 0), microscopic spin flipping time τ 0 = 10 -10 s and the critical exponent zν = 10 were obtained.
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