High Microwave Susceptibility of NaH2PO4·2H2O: Rapid Synthesis of Crystalline and Glassy Phosphates with NASICON-Type Chemistry

Synthesis and characterization of tin containing molybdophosphate and tungstophosphate glasses

“…A critical requirement is the coupling of at least one of the reactants to the microwave field to initiate and drive the melting reaction. It has been reported that NaH 2-PO 4 Á2H 2 O has a great microwave-absorbing ability [12]. In a typical experiment, required quantities of starting materials, NaH 2-PO 4 Á2H 2 O (Acros Organics), SnO (99.9% Alfa Aesar), WO 3 (99+% Aldrich) and MoO 3 (99+% Acros Organics), are placed in a silica crucible and exposed to microwave irradiation up to 10 min in a domestic microwave oven (Kerwave Ò , 2.45 GHz, 750 W nominal power).…”

Borophosphates: Hydrothermal and Microwave-Assisted Synthesis of Na5[B2P3O13]

“…The first step (:50 s) of the reaction is the loss of water molecules from the phosphate component; even the dehydrated product is still active with respect to microwave absorbtion (5). Dehydration of the borate component takes place simultaneously (5).…”

“…A microwave-assisted synthesis takes only 2 min to transform a solid mixture of borate and phosphate hydrates into the crystalline title compound. Pure Na 5 (2). Most of the borophosphates are preferably prepared by the hydrothermal method at temperatures below 200°C (2).…”

“…Dehydration of the borate component takes place simultaneously (5). Based on the earlier observations (5), the estimated maximum temperature of the system after 2 min treatment with microwave radiation is expected not to exceed 200°C.…”

“…Na 5 [B 2 P 3 O 13 ] was first prepared by high temperature synthesis (T max ‫؍‬ 780°C) and was characterized by X-ray single crystal investigations recently. We have now succeeded in the hydrothermal synthesis of the compound and obtained singlephase products at 150°C after 1-2 days.…”