For a first time are synthesized nanosized solid solutions with formula Al2-xInxCry(WO4)(2) (x = 0-2, y = 0.02-0.1). Co-precipitation method is used for the synthesis. It is established that only by strict maintenance of pH between 2.7 and 2.9 a pure, monophase product of In-2(WO4)(3) can be obtained. By X-ray powder diffraction and DTA/TG analyses, it is established that at room temperature the solid solutions Al2-xInx(WO4)(2) at x value between 0 and 1.1 are orthorhombic and for x value between 1.1 and 2.0 are monoclinic. The phase transition temperatures are defined for different x values. Results from Xray and TEM analyses show that nanosized pure Al2-xInx(WO4)(2) and Cr-doped Al2-xInxCry(WO4)(2) with size dimension between 10 and 40 nm can be successfully synthesized by co-precipitation method with subsequent thermal treatment at relatively low temperature (550 degrees C) for 1 h. (C) 2011 Elsevier B.V. All rights reserved.