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We report the results of neutron diffraction, ac and dc magnetization,heat-capacity, complex permittivity, and pyrocurrent measurements on an oxide,Li3NiRuO5, hitherto not paid much attention in the literature, except for aprevious report on its promising electrochemical performance. We emphasize onthe following findings: (i) Observation of re-entrant spin-glass behavior; thatis, this oxide undergoes ferrilmagnetic ordering below 8- K, enteringspin-glass regime around 12 K. (ii) There is no prominent feature in thecomplex dielectric permittivity (in particular, at the magnetic transitions) inthe absence of external magnetic field, indicative of the absence offerroelectricity. However, there is a distinct evidence for magneto-dielectric(MDE) coupling. The sign of MDE coupling also changes as the sample is cooledfrom ferrimagnetic state to spin-glass regime. (iii) There are pyroelectricanomalies in the vicinity of 30-70 K, presumably from thermally stimulateddepolarization current.

Re-entrant spin-glass freezing and magneto-dielectric behavior of Li3NiRuO6, a layered rock-salt related oxide