Lanthanum ferrite ferromagnetic nanocrystallites by a polymeric precursor route

Facile Preparation of n‐Type LaFeO3 Perovskite Film for Efficient Photoelectrochemical Water Splitting

“…While we observed two slight peaks around 225 cm −1 and 640 cm −1 , respectively, which are due to the Ag assigned modes and two‐photon scattering and impurity‐related scattering in the case of orthorhombic nanostructures. These features confirm the formation of the perovskite‐structure LFO …”

Crystal structures and magnetic properties of strontium and copper doped lanthanum ferrites

“…Very significant is the presence of open hysteresis loops for all compositions indicative of weak ferromagnetism. The weak ferromagnetism in LaFeO 3 based perovskites is a well documented effect [10,[12][13][14][15], while the appearance of hysteresis has been less investigated, and it has been observed at low temperatures in LaFeO 3 , [26][27][28], in La 1 À x Sr x FeO 3 [16] and in similar doped La-perovskites [29][30][31][32] (except for the Mn-based ones). Such weak ferromagnetism is associated with structural features and the multi-cationic nature of these oxide.…”

“…Considering the last case, the presence of ions with different magnetic moments and electronic structure implies: i) the presence of competing antiferromagnetic (AFM) and ferromagnetic (FM) interactions, and ii) the absence of compensation of the AFM order during the canting process because the magnetic competition is between ions of different magneto-chemical nature. In a wide number of perovskites weak ferromagnetism, spin-glass and exchange bias behaviors [26,33,34] result from the competition between AFM-FM interactions due to structural disorders. In our case the neutron measurements do not show the presence of ferromagnetic interactions hence we can discard this hypothesis.…”

Characterization of paramagnetic KHo(WO4)2 nanocrystals: Synthesized by polymeric mixed-metal precursor sol–gel method

“…Presence of porosity in the derived KHW powder may be due to flow of ammonia and CO 2 during the degradation of organic species present in the precursor gel. When the calcination time was increased at that same temperature 700 • C the particle size increases from nanometers to micron size [28][29][30]. The micron sized particles were quadrangular with well angular facets and surface of the particles are very smooth and flatten still some secondary particles were waiting to fuse on the surface of the particles.…”