Lead-Free Aurivillius Phase BiLaNbMnO: Structure, Ferroelectric, Magnetic, and Magnetodielectric Effects.

Aurivillius phase BiLaNbMnO, derived from ferroelectric PbBiNbO by simultaneous substitution of the -site and -site cations, was synthesized using a molten-salt method. Here, we discuss the structure-property relationships in detail. X-ray and neutron diffraction show that BiLaNbMnO adopts an 2 orthorhombic crystal structure.

Polar Structure and Two-Dimensional Heisenberg Antiferromagnetic Properties of Arylamine-Based Manganese Chloride Layered Organic-Inorganic Perovskites.

The breaking of inversion symmetry can enhance the multifunctional properties of layered hybrid organic-inorganic perovskites. However, the mechanisms by which inversion symmetry can be broken are not well-understood. Here, we study a series of MnCl-based 2D perovskites with arylamine cations, namely, (CHCHNH)MnCl ( = 0, 1, 2, 3), for which the = 0, 1, and 3 members are reported for the first time.

Morphology of Melt-Quenched Lead Telluride Single Crystals.

Metastable single crystals of nonstoichiometric PbTe are obtained by rapid cooling from the melt. The composition and crystallographic morphology are studied using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction. Most single crystals have cubic, pyramidal, or hemispherical shapes with sizes ranging from 50 to 400 μm.

Polar Nature of (CHNH)BiI Perovskite-Like Hybrids.

High-quality single crystals of perovskite-like (CHNH)BiI hybrids have been synthesized, using a layered-solution crystal-growth technique. The large dielectric constant is strongly affected by the polar ordering of its constituents. Progressive dipolar ordering of the methylammonium cation upon cooling below 300 K gradually converts the hexagonal structure (space group P6/mmc) into a monoclinic phase (C2/c) at 160 K.

Self-assembly of ferromagnetic organic-inorganic perovskite-like films.

Perovskite-based organic-inorganic hybrids hold great potential as active layers in electronics or optoelectronics or as components of biosensors. However, many of these applications require thin films grown with good control over structure and thickness--a major challenge that needs to be addressed. The work presented here is an effort towards this goal and concerns the layer-by-layer deposition at ambient conditions of ferromagnetic organic-inorganic hybrids consisting of alternating CuCl4-octahedra and organic layers.