NEW DATA ON CRYSTAL CHEMISTRY OF NANO-SIZED MICROPOROUS TITANOSILICATES WITH PHARMACOSIDERITE STRUCTURE

作者：Kostov Kytin Vladislav^*; Nikolova Rosica; Nakayama Noriaki; Simova Svetlana; Tzvetkova Paulina

来源：Comptes Rendus de l Academie Bulgare des Sciences, 2011, 64(5): 683-692.

• pharmacosiderite-type titanosilicates
• crystal-chemical imperfections
• (29)Si MAS-NMR spectroscopy

Direct syntheses of pure sodium, potassium and mixed (Na, K) nano-sized microporous titanosilicates with pharmacosiderite structure are reported. The obtained samples are characterized in terms of their crystallite size, compositional and structural imperfections. The smallest in size grains of the pure K-form are mostly affected by the titanium shortage. Preliminary (29)Si MAS-NMR data for the as-synthesized materials are discussed and a structural model is proposed illustrating the deficiency of Ti being located towards the crystallites periphery.

• 出版日期2011