Peculiarities of the local structure in new medium- and high-entropy, low-symmetry tungstates

New monoclinic ($P2$/$c$) tungstates - a medium-entropy tungstate, (Mn,Ni,Cu,Zn)WO$_4$, and high-entropy (Mn,Co,Ni,Cu,Zn)WO$_4$ were synthesized characterized. Their phase purity solid solution nature confirmed by powder X-ray diffraction Raman spectroscopy. absorption spectroscopy was used to probe the local structure around metal cations. The atomic structures based on ideal model optimized simultaneous analysis of extended fine spectra at multiple edges five for (Mn,Ni,Cu,Zn)WO$_4$ six means reverse Monte Carlo simulations. In both compounds, Ni$^{2+}$ ions have strongest tendency organize their environment form slightly distorted [NiO$_6$] octahedra, whereas Mn$^{2+}$, Co$^{2+}$, Zn$^{2+}$ strongly octahedral coordination. most intriguing result is that shape [CuO$_6$] octahedra in differs from found pure CuWO$_4$, where strong Jahn-Teller distortion present: become more regular with increasing degree dilution.