U. Peuchert et al., THE TRICLINIC ROOM-TEMPERATURE MODIFICATION OF K2MGWO2(PO4)(2), Acta crystallographica. Section C, Crystal structure communications, 53, 1997, pp. 11-14
K2MgWO2(PO4)(2) [dipotassium magnesium tungsten dioxide bis(phosphate)
; abbreviated formula KMgWP], a new compound crystal-chemically deriva
ble from the well known nonlinear optical crystal KTiOPO4 (KTP), under
goes at least five phase transitions between its melting point (T-m si
milar or equal to 1068 K) and room temperature. KMgWP's triclinic room
-temperature structure (space group P1) can be described as a slightly
distorted modification of its tetragonal high-temperature phase (T >
782 K), which is isostructural with K2NiWO2(PO4)(2) (KNiWP, space grou
p P4(1,3)2(1)2).