The Study On The Synthesis Of Novel Misfit-layered Metal Oxides With The K_0.81Li_0.27Ti_1.73O₄ As Precursor

The layed compounds are irreplaceable with other materials due to the special functions in the fields of materials science and technology. These materials can be used as heterogeneous catalysts, nonlinear optical materials, solid-phase protonic or electronic conductors, specific adsorbent materials for energy storage, hydrogen storage materials, superconductors, high-performance engineering materials, fire-retardant materials, as well as other functional materials in the fields of solid-phase electrochemistry, environmental protection and so on.There are two subsystems with different unit cell dimensions in the misfit-layered compounds. The misfit-layered compounds have been of great interests due to their unusual structures, and great potential applications in the fields of the electronic materials, the optic materials, the electrical materials, the magnetic materials, the catalytic materials and so on.The excellent physical, chemical, and optical properties have been found in titanates which are the more important materials. Layered K0.81Li0.27Ti1.73O4 has many potential applications in the photocatalysis, ion exchange, intercalation reaction and so on. In this thesis, by using K0.81Li0.27Ti1.73O4 as the precursor, a series of misfit-layered transition metal titanate oxide compounds have been synthesized and the conditions of the synthesis are investigated. The structures, compositions, and physical and chemical properties of these compounds have been studied by XRD, IR, TG-DTA, SEM, TEM, SAED,ICP.By using hydrothermal synthesis, the misfit-layered nickel titanate (NiTiO) has been synthesized. There are three sublattices in this compound, i.e. the orthorhombic sublattice of TiO2 and the two pseudo-hexagonal sublattices of Ni(OH)2, and these sublattices are incommensurate along the a and b directions. For TiO2 orthorhombic sublattice: aa=0.3743nm, ba=0.2951nm, ca=1.123nm,αa=βa=γa=90°, for two Ni(OH)2 pseudo-hexagonal sublattices: ab=bb= 0.7062nm,cb= 1.123nm,αb=βb=90°,γb=120°;ac=bc=0.310nm,cc=1.123nm,αc=βc=90°,γc=120°.The chemical formula of NiTiO is [Ni(OH)0.79(H2O)1.21]0.89(Ti1.73O4)? 0.91H2O. NiTiO loses all of water and is transformed into a mixture of NiTiO3 and Rutile when it is calcined at temperature upto 450℃.The misfit-layered copper titanate (CuTiO) has been hydrothermally synthesized. There are two sublattices in CuTiO, i.e. the orthorhombic sublattice of TiO2 and the pseudo-hexagonal sublattice of Cu(OH)2, and the two sublattices are incommensurate in the ab plane. The TiO2 orthorhombic sublattice parameters are aa=0.3473nm, ba=0.2716nm, ca=1.113nm andαa=βa=γa=90°, and the Cu(OH)2 pseudo-hexagonal sublattice parameters are ab=bb=0.2845nm, cb=1.113nm,αb=βb=90°andγb=120°.The chemical formula of CuTiO is [Cu(OH)0.70(H2O)1.29]0.83(Ti1.73O4). There are two steps of weightloss in TG curve. The weightloss from 25℃to 450℃is attributed to the loss of water; the weightloss from 450℃to 600℃is ascribed to the loss of oxygen, meanwhile CuTiO is transformed into a mixture of CuO and Rutile.