Cell volumes of APO₄, AVO₄, and ANbO₄ compounds, where A = Sc, Y, La–Lu

Zircon to monazite phase transition in CeVO4: X-ray diffraction and Raman-scattering measurements

“…A similar behavior was observed in pressure-induced monazite-structured for orthophosphates [8,9]. However, this behavior is in contrast with results in monazite-type CePO 4 and LaPO 4 [9,32]. The different axial compression of CeVO 4 and CePO 4 could be attributed to the more distorted monazite structure of CeVO 4 than that of [32].…”

“…However, this behavior is in contrast with results in monazite-type CePO 4 and LaPO 4 [9,32]. The different axial compression of CeVO 4 and CePO 4 could be attributed to the more distorted monazite structure of CeVO 4 than that of [32]. During the fitting we have excluded the pressurevolume data point collected at 12 GPa because it deviated from the systematic behavior of the rest of the data.…”

“…For HP measurements on CeVO 4 , finely grounded powder sample of CeVO 4 , along with 2-µm diameter ruby balls, was loaded in a pre-indented steel gasket with a 200-µm diameter hole inside a diamond-anvil cell (DAC). A 4:1 methanol-ethanol mixture was used as pressure-transmitting medium [13,14].…”

“…We have also performed compression measurements in CeVO 4 at ambient and hightemperature using steel-belted Bridgman-type opposed tungsten-carbide anvils with a tip of 15 mm in diameter [16]. The sample was contained in a pyrophyllite chamber which consists of two pyrophyllite gaskets of optimized thickness (0.5 mm each) in split gasket geometry.…”

Lattice Enthalpies of Lanthanide Orthovanadates LnVO4

“…6 LnVO 4 crystallize in zircon-type (ZrSiO 4 ) structure with I4 1 /amd space group (No. 141) and four molecules per unit cell; 11 they melt at high temperature, T m = 1710−2100 K. 12 The thermodynamic assessment of lanthanide orthovanadates is incomplete, although, e.g. five different sets exist in the changes of the standard enthalpy (CSE) of formation with values varying about 50 kJ mol -1 for SmVO 4 .…”