Full tests to stellar models below 1M⊙ have been hindered until now by the scarce number of precise measurements of the stars’ most fundamental parameters: their masses and radii. With the current observational techniques, the required precision to distinguish between different models (errors < 2-3 %) can only be achieved using detached eclipsing binaries where 1) both stars are similar in mass...

One century after the discovery of ferroelectricity, and two decades ferroelectric random access memories were first commercialized, this Special Issue Advanced Electronic Materials demonstrates that field ferroelectricity is in robust health. First, arises very different types material via mechanisms. Second, domains each type are liable to switch differently, for both intrinsic reasons (chemi...

Tb-Yb co-doped NaYF4 nanoparticles (NPs) are prepared by sintering the assynthesized NaYF4:Tb, Yb NPs at 380°C under air atmosphere. The oxidization of Tb ions to Tb ions in NaYF4 NPs after sintering is demonstrated through X-ray photoelectron spectroscopy (XPS). The near-infrared (NIR) downconversion (DC) luminescence of TbYb couple is measured and investigated for the first time. The results ...

The thermal expansion of the CaCu3Ti4O12 ceramics has been measured over a wide temperature range 120–1200 K. The high quality of the samples under study has been confirmed by good agreement of the results of measurements of the heat capacity in the range 2–300 K and in the vicinity of the phase transi tion of magnetic nature at 25 K with the data for the single crystal. No anomalies in the the...

“Perovskites” are materials with ABX3 stoichiometry (for example, calcium titanate, CaTiO3) that form crystal structures wherein “B” cations reside in the centers of corner-shared octahedra of “X” anions, with the “A” cations filling the resulting interstices. Perovskites have captivated researchers with properties such as superconductivity, ferroelectricity, piezoelectricity, ferromagnetism an...

•Hafnium and oxygen atoms in HfO2 are simultaneously resolved by the NCSI technique•Multiple polarization orders observed individual colloidal nanocrystals•The minimum volume that preserves spontaneous is found to be ∼4 nm3•Twinning induces at twin boundaries without symmetry breaking Current interest ferroelectrics results large part from their applications emerging non-volatile ferroelectric ...

•Large entropy of reduction and intermediate enthalpy reduction•pO2-dependent reversible structural transition: orthorhombic ? tetragonal cubic•Outstanding H2 yield 10 mL g?1 upon at 1,350°C a cycle time 1.5 h•H2 production rate limited by gas-phase mass transport rather than material kinetics A global transition away from fossil fuel energy to sustainable sources, in particular solar energy, r...

In analogy to the role of oxide anion in perovskites, halogen chemistry halide perovskites significantly contributes chemical, physical, and optoelectronic properties this class materials.Investigating manipulating site has improved our understanding electronic structure, reactivity, defect chemistry, ionic conductivity perovskites.A clear is expected (i) yield novel with targeted controlled (i...