Characterization of RMnO3 (R=Sc, Y, Dy-Lu): High-pressure synthesized metastable perovskites and their hexagonal precursor phases

High-pressure structural stability of multiferroic hexagonalRMnO3(R=Y, Ho, Lu)

“…The P6 3 cm is a stable structure in this pressure range at room temperature. From that, we can deduce that in previous work of synthesis of meta-stable orthorhombic materials [6,7,8], the heat treatment plays the key role in the thermal dynamic process. With the thermal treatment (the temperature ~1000 K), the atoms acquire enough energy to overcome chemical barriers required to break bonds needed to construct a different symmetry under pressure (~4 GPa).…”

“…Here it is found that the oxygen position parameters do not significantly vary with pressure. Moreover, for the general hexagonal (P6 3 cm) ABO 3 (A = RE, B= Mn, Fe and Ga) system, replacement of the A and/or B site by ions of different radii does not significantly modify the atomic positions [8,29,30,31]. Mn is approximately in the centre of its oxygen environment [32].…”

“…If the high temperature is accompanied with high pressure (~4 GPa and ~1000 °C) [6,7,8], the hexagonal (Hex) compound will be converted into a corresponding orthorhombic (Ortho) phase, which has a higher density and is strongly Jahn-Teller distorted [9]. By other techniques such as chemical solution method [10] and epitaxial thin film growth techniques [11,12], the orthorhombic compound also can be stabilized.…”

Structural, dielectric, antiferromagnetic, and thermal properties of the frustrated hexagonal Ho1−xErxMnOLiu1, Wang2, Cheng3 et al. 2011Phys. Rev. B23150View full textAdd to dashboardCite

“…Both calculated lattice parameters and structural data are in good line with another reported work. 17 Figure 3(a) presents the Er doping variations of the lattice parameters a and c of the single-phase Ho 1−x Er x MnO 3 compounds. The a lattice parameter decreases as the Er content increases, whereas the c lattice parameter, ranging from 11.39 to 11.42Å, nearly keeps constant with pretty minor fluctuations.…”

Magnetic and magnetotransport properties of the orthorhombic perovskites(Lu,Ca)MnO3

“…Indeed, highpressure ͑HP͒ synthesis techniques have been successfully utilized to realize the RMnO 3 perovskite phase for the smaller R constituents. [10][11][12][13] At the same time, efforts to dope the metastable phases with carriers have been rarely reported and so far focused on limited A-for-R substitution levels. 12,[14][15][16][17][18] In the present contribution, magnetic and magnetotransport properties are reported for the ͑Lu 1−x Ca x ͒MnO 3 system over the whole Ca-for-Lu substitution range, 0.0Յ x Յ 1.0.…”