ferroelectricity sentence in Hindi
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- Whereas the latter requires at least partially filled d-shells ( e . g .-orbitals ) providing a non-zero magnetic moment, usual displacive ferroelectricity requires empty d-shells.
- In lead titanate, another key ferroelectric material, although the structure is rather similar to barium titanate the driving force for ferroelectricity is more complex with interactions between the lead and oxygen ions also playing an important role.
- In analogy to ferromagnetic and paramagnetic materials, the Curie temperature can also be used to describe the phase transition between ferroelectricity and polarisation that goes from a finite value to zero when the temperature is increased above the Curie temperature.
- In 1974 R . B . Meyer used symmetry arguments to predict ferroelectric liquid crystals, and the prediction could immediately be verified by several observations of behavior connected to ferroelectricity in smectic liquid-crystal phases that are chiral and tilted.
- They realised that the free electrons in the metal would neutralise the effect of the polarization at a global level, but that the conduction electrons do not strongly affect transverse optical phonons, or the local electric field inherent in ferroelectricity.
- He has worked on novel nanoscale physical phenomena, especially in informational devices such as FeRAMs and RRAMs . He elucidated the physical mechanism of the fatigue problem in FeRAMs . He also addressed the critical thickness of ultrathin films where they lose ferroelectricity.
- Cady held more than 50 patents, and was the inventor of the crystal-controlled oscillator, the highly selective narrow-band crystal filter, one of the principal theorists of the ferroelectricity in crystals, and a historian of the science of piezoelectric crystals.
- His areas of involvement include solid-state chemistry ( structure-property-processing-performance relationship ), x-ray diffraction, high pressure phase studies, thermal analysis, magnetic materials, crystal growth, ferroelectricity, injection moulding, rapid prototyping and ceramic processing.
- One prominent example for a charge ordered multiferroic is LuFe 2 O 4, which shows improper ferroelectricity below 330 K . The arrangements of the electrons arise from the charge frustration on a triangular lattice with the mixed valence state of Fe 2 + and Fe 3 + ions.
- The availability of practical routes to creating multiferroic materials from 2000 the observation that the non-collinear magnetic ordering in orthorhombic TbMnO 3 and TbMn 2 O 5 causes ferroelectricity, and the identification of unusual improper ferroelectricity that is compatible with the coexistence of magnetism in hexagonal manganite YMnO 3.
- The availability of practical routes to creating multiferroic materials from 2000 the observation that the non-collinear magnetic ordering in orthorhombic TbMnO 3 and TbMn 2 O 5 causes ferroelectricity, and the identification of unusual improper ferroelectricity that is compatible with the coexistence of magnetism in hexagonal manganite YMnO 3.
- The cause of such interest is that these crystals can be used as good model objects for the investigation of such key phenomena in solid state physics as quantum tunnelling of atomic particles in solid state, cooperative properties of the system of local centers with internal degrees of freedom, and ferroelectricity.
- The PJTE theory of ferroelectricity in ABO3 crystals was expanded to show that, dependent of the number of electrons in the d n shell of the transition metal ion B 4 + and their low spin or high spin arrangement ( which controls the symmetry and spin multiplicity of the ground and PJTE active excited states of the [ BO 6 ] center ), their ferroelectricity may coexist with a magnetic moment ( multiferroicity ).
- The PJTE theory of ferroelectricity in ABO3 crystals was expanded to show that, dependent of the number of electrons in the d n shell of the transition metal ion B 4 + and their low spin or high spin arrangement ( which controls the symmetry and spin multiplicity of the ground and PJTE active excited states of the [ BO 6 ] center ), their ferroelectricity may coexist with a magnetic moment ( multiferroicity ).
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