Layered rare-earth hydroxides: a new family of anion-exchangeable layered inorganic materials

Abstract

The review summarizes the data on the chemical composition, crystal structure and functional properties of layered rare-earth hydroxides (LRHs), a new family of anion-exchangeable inorganic compounds. Comprehensive information is given on methods for the synthesis of LRHs including hydrothermal and hydrothermal-microwave treatment. Particular attention is paid to the methods of chemical design of hybrid functional materials based on LRHs. Prospects for fabrication of phosphors, heterogeneous catalysts and biomedical materials based on LRHs are analyzed. The bibliography includes 295 references.

Meet the Cerium(IV) Phosphate Sisters: CeIV(OH)PO4 and CeIV2O(PO4)2

“…Of the wide range of inorganic salts of rare earth elements, compounds in which REE ions have an oxidation state of +3 are the most widespread. They are mainly represented by neutral and basic salts, including the well‐studied compounds CeOHCO 3 and CeOHSO 4 …”

“…[1] Of the wide range of inorganic salts of rare earth elements, compoundsi nw hichR EE ions have an oxidation state of + 3a re the most widespread. They are mainly represented by neutral [2] and basic salts, [3][4] including the well-studied compounds CeOHCO 3 and CeOHSO 4 . [5][6][7] Among REE, cerium has as pecial place, as it can easily change its oxidation state (+ 3$ + 4).…”

The first amorphous and crystalline yttrium lactate: synthesis and structural features

“…19 Interestingly, at nearly neutral pH ($6) and under mild hydrothermal conditions, the interaction of rare earth ions with mono-or bidentate ligands can result in polynuclear coordination compounds, which are oen regarded as layered rare earth hydroxides (LRHs) comprising innite positively charged 2D layers of [RE(OH) 3Àn ] n+ bonded by the ligands into laminate structures. [61][62][63] These ion-exchangeable and exfoliatable substances have a great deal of exibility in terms of their chemical composition 61,[64][65][66] and are now regarded as a basis for promising bioactive theranostic materials. 67,68 From the ndings of the current study, a paper-like material couldn't be classied as a layered rare earth hydroxide as the positions of the maxima in its diffraction pattern (see Fig.…”

Methods Used for the Compaction and Molding of Ceramic Matrix Composites Reinforced with Carbon Nanotubes

“…The methods described above are powerful for molding ceramics from prospective inorganic materials that would come in broad use in the near future [213][214][215][216][217][218]. An innovative composite material has been reported very recently, which demonstrated an extremely high resistance against abrasive wear under the action of cutting tools and water jets [219].…”