2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27576Spin relaxation in a site-disordered Ising model within master equation approach is studied. The $\vec{q},ω$-dependent susceptibility of the model is calculated and investigated. Effects described by the two-site cluster approximation and lost by the mean field approximation are discussed. Comparison of obtained results with dielectric measurements in $Cs(H_{1-x}D_x)_2PO_4$ is presented.16 (small) pages, lplain emtex with fancyhea, twoside; pcx figuresCondensed Mattertext