We have developed a new automatic sample-preparation robot system with use of the volumetric-weighing method. In this system, slurries, aqueous solutions, and other wet reagents are employed as starting materials and 64 (8 x 8) samples at the maximum are prepared on a library plate of 35 mm x 35 mm size. Volumetric-weighing and mixing of the starting materials and distributing reaction mixtures to the library plate are automatically performed by computer-controlled mechanisms with an easy-to-use programming software interface. While this robot is designed in terms of space saving and portability, it is able to equip with an atmosphere-controlled furnace to sinter the samples on the library plate. Typical preparation time for a library plate of 36 (6 x 6) samples is less than 40 min. This robot system is promising in enhancing throughput of wet-chemically synthesized materials researches. (c) 2005 Elsevier B.V. All rights reserved.