Results 101 to 110 of about 32,911 (288)

High-pressure phase and transition phenomena in ammonia borane NH3BH3 from X-ray diffraction, Landau theory, and ab initio calculations

, 2009
Structural evolution of a prospective hydrogen storage material, ammonia borane NH3BH3, has been studied at high pressures up to 12 GPa and at low temperatures by synchrotron powder diffraction.
A. Spek, Andriy H. Nevidomskyy, B. Peng, Dmitry Chernyshov, H. T. Stokes, J. E. Dennis, P. Toledano, R. G. Parr, V. I. Bakhmutov, Vladimir Dmitriev, Yaroslav Filinchuk, Yu. A. Izyumov   +11 more
core   +1 more source

Polymorphic Superparaelectric Engineering Boosting Energy Storage Capacity in BaTiO3‐Based Ceramics

Advanced Science, EarlyView.
Herein, Ca2+ incorporation promotes the coexistence of CaTiO3‐/BaTiO3‐derived paraferroelectric states, stabilizing cubic‐orthorhombic‐tetragonal polymorphic superparaelectric phases. This minimizes polarization energy barriers, facilitating full polarization saturation without compromising efficiency.
Pan Liu, Xiang Ren, Jin Qian, Haihua Huang, Peng Li, Peng Fu, Jigong Hao, Huarong Zeng, Wei Li, Zhenxiang Cheng   +9 more
wiley   +1 more source

Synthesis and crystal structure analysis of the magnetic ternary compound Mn2GeTe4 [PDF]

Avances en Química, 2009
Samples of the ternary phase Mn2GeTe4 were synthesized by direct fusion using the anneal method. X-ray powder diffraction results indicated that this material crystallizes with orthorhombic symmetry, space group Pnma, and unit cell parameters: a = 13.950(
Miguel Quintero, Jines E. Contreras, Pedro Grima- Gallardo, Asiloé J. Mora, Luis Betancourt, Gerzon E. Delgado   +5 more
doaj  

Sustainable Materials Design With Multi‐Modal Artificial Intelligence

Advanced Science, EarlyView.
Critical mineral scarcity, high embodied carbon, and persistent pollution from materials processing intensify the need for sustainable materials design. This review frames the problem as multi‐objective optimization under heterogeneous, high‐dimensional evidence and highlights multi‐modal AI as an enabling pathway.
Tianyi Xu, Tianshuo Wei, Yan Ge, Bo Peng, Yue Li, Maolin Wang, Peng Wen, Chao Yang, Ye Wei   +8 more
wiley   +1 more source

Crystallographic changes in lead zirconate titanate due to neutron irradiation

AIP Advances, 2014
Piezoelectric and ferroelectric materials are useful as the active element in non-destructive monitoring devices for high-radiation areas. Here, crystallographic structural refinement (i.e., the Rietveld method) is used to quantify the type and extent of
Alexandra Henriques, Joseph T. Graham, Sheldon Landsberger, Jon F. Ihlefeld, Geoff L. Brennecka, Donald W. Brown, Jennifer S. Forrester, Jacob L. Jones   +7 more
doaj   +1 more source

Characterization and densification of defect pyrochlore oxide powders ABi2Ta5O16 (A=Na, Tl)

Heliyon, 2019
Defect pyrochlore oxide powders ABi2Ta5O16, in the pseudo-binary systems BiTaO4–ATa3O8 (A = Na, Tl), were prepared by solid state method. The structural study showed that all oxides crystallize in a cubic system with the space group Fd3m, the lattice ...
O. Ait Sidi Ahmed, L. Bourja, A. Chagraoui, A. Tairi, A. Moussaoui, H. Ait Oulahyane, B. Manoun, S. Villain   +7 more
doaj   +1 more source

Physical Implementation of Optical Material‐Based Neural Networks Processing Enabled by Long‐Persistent Luminescence

Advanced Science, EarlyView.
This study reports on the physical implementation of optical material‐based neural processing using long‐persistent luminescence as memory‐retention and nonlinear optical material. The system performs optical‐domain preprocessing with opto‐electronic interfaces for stimulus delivery and readout, enabling real‐time demonstrations including Pong gameplay
Sangwon Wi, Yunsang Lee
wiley   +1 more source

X-ray study of potassium feldspars from different granitoid types and gneisses of Papuk Mt. (Slavonia, Croatia)

Geologia Croatica, 2011
Potassium feldspars from different granitoids and gneisses of Papuk Mt. (Slavonia, Croatia) have been investigated by X-ray powder diffraction. Diffraction patterns classically observed as well as patterns calculated by Rietveld refinement were compared ...
Marija Horvat, Darko Tibljaš, György Buda, György Lovas   +3 more
doaj   +1 more source

Morphological and Crystallographic Characterization of Nanoparticles by Granulometry Image Analysis and Rietveld Refinement Methods

Iranian Journal of Chemistry & Chemical Engineering, 2019
The particle size distribution of the resultant cobalt ferrite samples was determined from Scanning Electron Microscopy (SEM) images using the granulometry image analysis method. Results showed the nanosized particles of the samples. The X-Ray Diffraction (XRD) patterns of samples were also analyzed by Rietveld refinement method.
Ganjkhanlou, Yadolah, Bayandori Moghaddam, Abdolmajid   +1 more
openaire   +2 more sources

Manipulating Atomic Disorder and Mesoscale Architectures for High‐Efficiency Thermoelectric Modules

Advanced Science, EarlyView.
The in situ reaction of PbTiO3 precursor reacts in situ with the Bi0.5Sb1.5Te3 matrix, effectively enlarging the energy barrier for minority carrier excitation and suppressing bipolar diffusion, and predominantly scattering mid‐to‐low frequency phonons. Ultimately, a single thermoelectric module was fabricated to achieve a competitive efficiency of ∼7%
Jiwu Xin, Bo Wang, Chengyun Xu, Wang Li, Pengyu Zhang, Dongwang Yang, Yongke Wang, Jinfeng Dong, Lei Wei, Ting Zhang, Qinghui Jiang   +10 more
wiley   +1 more source