SVIBOR - Project code: 1-07-190

MINISTRY OF SCIENCE AND TECHNOLOGY

Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69
E-mail: ured@znanost.hr

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Project code: 1-07-190


Study of metal oxide, oxide glasses and zeolites


Main researcher: MUSIĆ, SVETOZAR (32832)


Assistants
Type of research: basic
Duration from: 01/01/91. to 12/31/95.
Papers on project (total): 131
Papers on project quoted in Current Contents: 53
Institution name: Institut "Ruđer Bošković", Zagreb (98)
Department/Institute: Technology, nuclear energy and protection
Address: Bijenička 54
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (041)461 094
E-mail: music@olimp.irb.hr
Fax: 385 (041) 425 497
Summary: This project seeks to unite the scientific interests and skillsof Dr. S. Musić and Dr. B. Subotić and their coworkers incombined study of metal oxides, oxide glasses and zeolites. Thesematerials have found application in a variety of fields such asmicrowave and magneto-optical devices, sensors, coatings,pigments, ion-exchangers, catalysts, absorbents etc. Theproperties of these materials which give rise to their diverseapplications derive from their specific chemistry and structures.The benefits of this Project may be summarised as follows: a) toincrease the range of information available on metal oxides,oxide glasses and zeolites, b) develop a scientific approach tounderstanding the influence of synthetic procedures on chemical,physical and structural properties of the materials produced, c)enable some appreciation of how fundamental properties of thesematerials may be modified by changes in the synthetic procedures,and d) establish a method by which identified technologicalproperties can be achieved by appropriate modification ofpreparative procedures. Dr. S.Musić supervises the investigations: of the influence ofsynthetic procedures on the chemical and structural properties of metal oxides and mixed metal oxides with corundum structure,influence of corundum-type cations on the structural propertiesof zirconium oxide, chemical, structural and magnetic propertiesof mixed metal oxides with spinel, perovskite or garnet structureand, coordination and valence of corundum type cations in oxideglasses. Dr. B. Subotić supervises the investigations: study ofmechanism and kinetics of crystallization and transformation ofdifferent types of zeolites with special emphasis to themechanism and kinetics of nucleation and crystal growth ofzeolite particles, modeling and simulation of the processes ofcrystallization and transformation of different types ofzeolites, study of mechanism and kinetics of dissolution ofzeolites and amorphous aluminosilicates in alkaline solutionsand, mechanochemistry of zeolites: study of the influence ofmechanical force on the structural changes of zeolite crystals aswell as the preparation of amorphous precursors for obtainingspecial ceramic materials by mechanical amorphization ofdifferent zeolites exchanged with different cations.

Keywords: metal oxides, mixed metal oxides, oxide glasses, zeolites, gel, synthesis, nucleation

Research goals: Investigation of the mixed metal oxides of spinel, perovskite or garnet structure should expand our knowledge about influence of preparation procedure on their chemical, physical and structural properties. One of the aims of these investigations is obtaining the fundamental data about the nature of chemical bond, coordination and valence state of the metal cations in the oxide glasses. The specific behaviors of the metal oxides, concerning their colloid and surface properties, were established. Investigation of the processes of the nucleation and crystal growth of zeolites and dissolution of the alumesilicate precursors (and zeolites) should contribute to: a) new basic knowledge about these processes on the molecular level, b) improvment of the synthesis procedure of known types of zeolites in order to obtain pure products of desired properties (such as ion-exchange, absorption, molecular sieve and catalitic) and c) synthesis of a new zeolite structures of predictable properties. Mechanochemical treatment of different materials (e.g. amorphisation of zeolites) gives materials (precursors) of special properties (exactly defined composition and structure, particle size, etc.) which are used for preparation of special ceramics and composites (zeolite synthesis). On the basis of these investigations it is possible to designe oxide materials with specific chemical and/or physical properties of the interest for modern technologies.
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