Negative thermal expansion in rare earth tritungstates and trimolybdates. Study on Ho2(MO4)3 and Tm2(MO4)3 (M=Mo and W)
Negative thermal expansion in crystals with gamma-Sc2(WO4)3-type structure (Pbcn space group) has resulted in increased interest. Moreover, some of rare-earth trimolybdates and tritungstates show a phase transition at low and/or high temperature. Up to now, the mechanisms of this anomalous behavior and the origin of the structural instability are not well established. Recently, it has been found that Ho and Tm trimolybdates and Tm tritungstate adopt an orthorhombic structure and show NTE, whereas Ho tritungstate adopts a monoclinic structure and shows positive expansion. We want to complete our study of these materials by comparing tungstates and molybdates with more symmetric related materials (NASICON or garnet structures), by analyzing the symmetry adapted modes. We have selected four compounds: Ho2(MoO4)3, Tm2(MoO4)3, Ho2(WO4)3 and Tm2(WO4)3 to measure in the beamline D2B, where we have previously obtained successful results.
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GONZALEZ SILGO Maria Cristina; GONZALEZ PLATAS Javier; GUZMAN AFONSO Maria Candelaria; HERNANDEZ SUAREZ Ana; LOPEZ SOLANO Javier; MATESANZ Emilio; MESTRES Lourdes; MUJICA Andrés; RODRIGUEZ-CARVAJAL Juan; SABALISCK NANCI; TORRES Manuel and VENDRELL Xavier. (2013). Negative thermal expansion in rare earth tritungstates and trimolybdates. Study on Ho2(MO4)3 and Tm2(MO4)3 (M=Mo and W). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-655
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