Magneto-optical investigations of phase-transition-induced band-structure changes ofPb1−xGexTe

1985 ◽  
Vol 31 (12) ◽  
pp. 7958-7978 ◽  
Author(s):  
E. Bangert ◽  
G. Bauer ◽  
E. J. Fantner ◽  
H. Pascher
Keyword(s):  
Phase Transition ◽  
Band Structure ◽  
Structure Changes

Rem and Rheed Studies of Pb Adsorption on Si(111)

1992 ◽  
Vol 280 ◽  
Author(s):  
Yasumasa Tanishiro ◽  
Masahiko Fukuyamaand ◽  
Katsumichi Yagi
Keyword(s):  
Phase Transition ◽  
Heat Treatment ◽  
Phase Diagram ◽  
Surface Structures ◽  
Structure Changes ◽  
Incommensurate Structures

ABSTRACTStructure changes of Si(111)-Pb surfaces due to deposition and heat treatment are studied by REM-RHEED. Surface structures observed are summarized as a phase diagram. Formation of an incommensurate layer(α) and a phase transition between incommensurate structures of α and α' is described.

Phase Transition of LiMn2O4 Spinel and its Application for Lithium Ion Secondary Battery

1997 ◽  
Vol 496 ◽  
Author(s):  
Junji Tabuchi ◽  
Tatsuji Numata ◽  
Yuichi Shimakawa ◽  
Masato Shirakata
Keyword(s):  
Phase Transition ◽  
Lithium Ion ◽  
Electrochemical Characteristics ◽  
Teller Distortion ◽  
Limn2o4 Spinel ◽  
Structure Changes ◽  
Jahn Teller ◽  
Initial Charge ◽  
Lower Temperature ◽  
Jahn Teller Distortion

ABSTRACTLiMn2O4 has a phase transition at room temperature, which is caused by Jahn-Teller distortion. DC resistivity of LiMn2O4 shows an anomaly at the transition temperature, while no such anomaly is observed in samples with excess lithium. X-ray diffraction patterns of LiMn2O4reveal that the crystal structure changes from cubic at higher temperature to orthorombic, as a first approximation, at lower temperature. However, no differences in initial charge-discharge curve are observed, which means that the Jahn-Teller distortion has no effect on electrochemical characteristics. The authors have succeeded in mass-producing lithium ion secondary batteries with a manganese spinel cathode.

Lattice and electronic band structure changes across the surface ferroelectric transition

1998 ◽  
Vol 249 (5-6) ◽  
pp. 505-511 ◽  
Author(s):  
Jaewu Choi ◽  
P.A. Dowben ◽  
Stephen Ducharme ◽  
V.M. Fridkin ◽  
S.P. Palto ◽  
...  
Keyword(s):  
Band Structure ◽  
Electronic Band Structure ◽  
Electronic Band ◽  
Ferroelectric Transition ◽  
Structure Changes

scholarly journals Controllable band structure and topological phase transition in two-dimensional hydrogenated arsenene

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Ya-ping Wang ◽  
Wei-xiao Ji ◽  
Chang-wen Zhang ◽  
Ping Li ◽  
Feng Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Band Structure ◽  
Topological Phase ◽  
Two Dimensional ◽  
Topological Phase Transition

Ab initio investigations of TlI-type compounds under high pressure

2004 ◽  
Vol 219 (6) ◽  
Author(s):  
Daniel Becker ◽  
Horst P. Beck
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Electron Pair ◽  
Elevated Pressure ◽  
Type Structure ◽  
Electronic Density ◽  
Structure Changes ◽  
Cscl Type ◽  
Wide Pressure Range ◽  
The Stability

AbstractIn this work, we present a theoretical study (based on DFT-calculations) in a wide pressure range of the structural and electronic properties and the stability of compounds crystallising in a TlI- or CrB-type structure. Both structure types have the characteristic structural feature of zigzag chains with unusual short homonuclear distances. The main focus of this study is to elucidate the nature of bonding within these zigzag chains at ambient and elevated pressure. For this purpose we discuss the evolution of the distances within the zigzag chains with pressure, the transition pressure of the phase transition to a CsCl-type arrangement (high-pressure phase) and compressibilities of the low- and high-pressure phases. For a better understanding of the structure and bonding, the band structures of these compounds are evaluated. The calculations are complemented by an orbital analysis using the crystal orbital Hamilton population (COHP) and an analysis of the electronic density topology with the electron localisation function (ELF). Our study indicates that there is a bonding electron pair in compounds crystallising in the CrB-type structure and that the nature of the electron pair does not change significantly at elevated pressure up to the phase transition. However, the “character” of the additional electron pair in the In-monohalides (TlI-type structure) changes with increasing pressure from nonbonding to bonding. The phase transition to a CsCl- type structure implies a fundamental change to nonbonding stereochemically inert electron pairs for all compounds.

Control of the Optical Band Structure of Liquid Crystal Infiltrated Inverse Opal by a Photoinduced Nematic−Isotropic Phase Transition

2002 ◽  
Vol 124 (37) ◽  
pp. 10950-10951 ◽  
Author(s):  
Shoichi Kubo ◽  
Zhong-Ze Gu ◽  
Kazuyuki Takahashi ◽  
Yoshihisa Ohko ◽  
Osamu Sato ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Band Structure ◽  
Isotropic Phase ◽  
Inverse Opal ◽  
Structure Of Liquid

scholarly journals On the high temperature phase transition in Ba(Zr0.20Ti0.80)O3 ceramic

2017 ◽  
Vol 07 (04) ◽  
pp. 1750025 ◽  
Author(s):  
K. P. Chandra ◽  
A. R. Kulkarni ◽  
K. Prasad
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Lattice Structure ◽  
High Temperature Phase ◽  
Monoclinic Space Group ◽  
Temperature Phase ◽  
Potential Candidate ◽  
Space Group ◽  
Structure Changes ◽  
Temperature Phase Transition

Temperature dependent X-ray diffraction (XRD) and dielectric properties of perovskite Ba(Zr[Formula: see text]Ti[Formula: see text]O3 ceramic prepared using a standard solid-state reaction process is presented. Along with phase transitions at low temperature, a new phase transition at high temperature (873[Formula: see text]C at 20[Formula: see text]Hz), diffusive in character has been found where the lattice structure changes from monoclinic (space group: [Formula: see text] to hexagonal (space group: [Formula: see text]). This result places present ceramic in the list of potential candidate for intended high temperature applications. The AC conductivity data followed hopping type charge conduction and supports jump relaxation model. The experimental value of [Formula: see text][Formula: see text]pC/N was found. The dependence of polarization and strain on electric field at room temperature suggested that lead-free Ba(Zr[Formula: see text]Ti[Formula: see text]O3 is a promising material for electrostrictive applications.

Visualizing electronic structure changes across an antiferroelectric phase transition: Pb2MgWO6

1999 ◽  
Vol 9 (10) ◽  
pp. 2463-2466 ◽  
Author(s):  
Ram Seshadri ◽  
Guido Baldinozzi ◽  
Claudia Felser ◽  
Wolfgang Tremel
Keyword(s):  
Phase Transition ◽  
Electronic Structure ◽  
Antiferroelectric Phase ◽  
Structure Changes
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