An aim of this work was to determine an influence of an admixture, the chromium (for x from 0.01 to 0.06), on the mechanical properties of the PFN ceramics. The ceramics with chemical composition Pb(Fe0.5−xCrxNb0.5)O3 was synthesized in two steps from simple oxides PbO, Fe2O3, Nb2O5, Cr2O3. The first stage was based on obtaining the FeNbO4 from the Fe2O3 and Nb2O5 simple oxides. At this stage an admixture in a form the Cr2O3 chromium oxide was added to the solution. In the second stage the PbO lead oxide and the doped FeNbO4 (obtained earlier) were synthetized. The sintering of ceramic samples PFCN type was carried out by free sintering method. Temperature measurements of the internal friction were conducted on a computer-controlled automatic resonant mechanical spectrometer (heating cycle with 3 deg/min).
 R. Zachariasz, D. Bochenek, Parameters of ceramics obtained on the base PZT used to build electroacoustic converters, J. Phys. IV 137, 189-192 (2006).
 D. Bochenek, J. Dudek, Influence of the processing conditions on the properties of the biferroic Pb (Fe1/2Nb1/2) O3 ceramics, Eur. Phys. J –Spec. Top. 154, 19-22 (2008).
 K.F. Wang, J.-M. Liu, Z.F. Ren, Multiferroicity: the coupling between magnetic and polarization orders, Adv. Phys. 58, 4, 321-448 (2009).
 O. Raymond, R. Font, N. Suárez – Almodovar, J. Portelles, J. M. Siqueiros, Frequency-temperature response of ferroelectromagnetic PbFe1/2Nb1/2O3 ceramics obtained by different precursors. Part I. Structural and thermo-electrical characterization, J. Appl. Phys. 97, 084107 (2005).
 M.H. Lente, J.D.S. Guerra, G.K.S. de Souza, B.M. Fraygola, C.F.V. Raigoza, D. Garcia, J.A. Eiras, Nature of the magnetoelectric coupling in multiferroic Pb(Fe1/2Nb1/2)O3 ceramics, Phys. Rev. B 78, 054109-1–054109-6 (2008).
 J.T. Wang, M.K. Mbonye, Ch. Ahang, Dielectric, piezoelectric and magnetic properties of ferroelectromagnet Pb(Fe1/3Nb2/3) O3 (PFN) ceramics, Int. J. Mod. Phys. B 17, 3732-3737 (2003).
 D. Bochenek, P. Kruk, R. Skulski, P. Wawrzała, Multiferroic ceramics Pb(Fe1/2Nb1/2)O3 doped by Li, J. Electroceram. 26, 8–13 (2011).
 D. Bochenek, Z. Surowiak, Influence of admixtures on the properties of biferroic Pb(Fe0.5Nb0.5)O3 ceramics, Phys. Status Solidi A 206, 2857–2865 (2009).
 K. Wójcik, K. Zieleniec, M. Mulata, Electrical Properties of Lead Iron Niobate PFN, Ferroelectrics 289, 107 (2003).
 R. Zachariasz, B. Brus, A. Zarycka, M. Czerwiec, J. Ilczuk, An application of measurements of amplitude internal friction dependences for tests of ceramic materials, Phys. Status Solidi A 205, 1120-1125 (2008).
 A. Zarycka, R. Zachariasz, J. Ilczuk, A. Chrobak, Internal friction related to the mobility of domain walls in sol-gel derived PZT ceramics, Materials Science – Poland 23 (1), 159-165 (2005).
 R. Zachariasz, J.A. Bartkowska, D. Bochenek, P. Niemiec, Internal friction in the ferroelectric-ferromagnetic composites, Arch. Metall. Mater. 58, 1327-1330 (2013)
 D. Bochenek, Z. Surowiak, J. Krok – Kowalski, J. Poltierova – Vejpravova, Influence of the sintering conditions on the physical proprieties of the ceramic PFN multiferroics, J. Electroceram. 25, 122-129 (2010).
 K. Singh, S.A. Band, W.K. Kinge, Effect of sintering temperature on dielectric properties of perowskite material, Ferroelectrics 306, 179-185 (2004).
 R. Zachariasz, B. Bruś, A. Zarycka, M. Czerwiec, J. Ilczuk, Application of measurements of internal friction amplitude dependences for tests of ceramic materials, Phys. Status Solidi A 205 (51), 120-1125 (2008).
 R. Zachariasz, D. Bochenek, Low frequency elastic and anelastic properties of Pb(Fe0.5Nb0.5)O3 ferroelectric ceramics; Eur. Phys. J –Spec. Top. 154, 253-256 (2008).
 J.F. Delorme, I.N.S.A. Villeurbanne, P.F. Gobin, Internal Friction and Microdeformation Associated With Martensitic Transformation of Metallic Solids – 1: Metaux (Corros-Ind) 48, 573, 185-200 (1973).