Ambient-pressure specific heat of single-crystal

2006 ◽  
Vol 378-380 ◽  
pp. 961-962 ◽  
Author(s):  
J.C. Lashley ◽  
R.A. Fisher ◽  
J. Flouquet ◽  
F. Hardy ◽  
A. Huxley ◽  
...  
Keyword(s):  
Single Crystal ◽  
Specific Heat ◽  
Ambient Pressure

scholarly journals Doping dependence of the specific heat of single-crystal BaFe2(As1−xPx)2

2012 ◽  
Vol 85 (18) ◽  
Author(s):  
C. Chaparro ◽  
L. Fang ◽  
H. Claus ◽  
A. Rydh ◽  
G. W. Crabtree ◽  
...  
Keyword(s):  
Single Crystal ◽  
Specific Heat ◽  
Doping Dependence

Specific heat of single crystal Ba0.6K0.4BiO3 at low temperatures

1996 ◽  
Vol 97 (3) ◽  
pp. 175-178 ◽  
Author(s):  
E.B. Nyeanchi ◽  
D.F. Brewer ◽  
T.E. Hargreaves ◽  
N.E. Hussey ◽  
A.L. Thomson ◽  
...  
Keyword(s):  
Single Crystal ◽  
Specific Heat ◽  
Low Temperatures

scholarly journals Influence of Crystallite Size on the Magnetic Order in Semiconducting ZnCr2Se4 Nanoparticles

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3947 ◽  
Author(s):  
Ewa Malicka ◽  
Małgorzata Karolus ◽  
Tadeusz Groń ◽  
Adrian Gudwański ◽  
Andrzej Ślebarski ◽  
...  
Keyword(s):  
Single Crystal ◽  
Specific Heat ◽  
Spin Glass ◽  
Crystallite Size ◽  
Magnetic Order ◽  
Ac Susceptibility ◽  
High Energy ◽  
Zero Field ◽  
Bulk Single Crystal ◽  
Field Cooling

Structural, electrical, magnetic, and specific heat measurements were carried out on ZnCr2Se4 single crystal and on nanocrystals obtained from the milling of this single crystal after 1, 3, and 5 h, whose crystallite sizes were 25.2, 2.5, and 2 nm, respectively. For this purpose, the high-energy ball-milling method was used. The above studies showed that all samples have a spinel structure, and are p-type semiconductors with less milling time and n-type with a higher one. In turn, the decrease in crystallite size caused a change in the magnetic order, from antiferromagnetic for bulk material and nanocrystals after 1 and 3 h of milling to spin-glass with the freezing temperature Tf = 20 K for the sample after 5 h of milling. The spin-glass behavior for this sample was derived from a broad peak of dc magnetic susceptibility, a splitting of the zero-field-cooling and field-cooling susceptibilities, and from the shift of Tf towards the higher frequency of the ac susceptibility curves. A spectacular result for this sample is also the lack of a peak on the specific heat curve, suggesting a disappearance of the structural transition that is observed for the bulk single crystal.

scholarly journals Effect of pressure on the crystal structure of L-serine-I and the crystal structure of L-serine-II at 5.4 GPa

2005 ◽  
Vol 61 (1) ◽  
pp. 58-68 ◽  
Author(s):  
Stephen A. Moggach ◽  
David R. Allan ◽  
Carole A. Morrison ◽  
Simon Parsons ◽  
Lindsay Sawyer
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Hydrogen Bonds ◽  
Single Crystal ◽  
Ambient Pressure ◽  
Crystal Form ◽  
Hydroxyl Groups ◽  
Orthorhombic Space Group ◽  
Crystal Forms ◽  
Hydrogen Bonded

The crystal structure of L-serine has been determined at room temperature at pressures between 0.3 and 4.8 GPa. The structure of this phase (hereafter termed L-serine-I), which consists of the molecules in their zwitterionic tautomer, is orthorhombic, space group P212121. The least compressible cell dimension (c), corresponds to chains of head-to-tail NH...carboxylate hydrogen bonds. The most compressible direction is along b, and the pressure-induced distortion in this direction takes the form of closing up voids in the middle of R-type hydrogen-bonded ring motifs. This occurs by a change in the geometry of hydrogen-bonded chains connecting the hydroxyl groups of the —CH2OH side chains. These hydrogen bonds are the longest conventional hydrogen bonds in the system at ambient pressure, having an O...O separation of 2.918 (4) Å and an O...O...O angle of 148.5 (2)°; at 4.8 GPa these parameters are 2.781 (11) and 158.5 (7)°. Elsewhere in the structure one NH...O interaction reaches an N...O separation of 2.691 (13) Å at 4.8 GPa. This is amongst the shortest of this type of interaction to have been observed in an amino acid crystal structure. Above 4.8 GPa the structure undergoes a single-crystal-to-single-crystal phase transition to a hitherto uncharacterized polymorph, which we designate L-serine-II. The OH...OH hydrogen-bonded chains of L-serine-I are replaced in L-serine-II by shorter OH...carboxyl interactions, which have an O...O separation of 2.62 (2) Å. This phase transition occurs via a change from a gauche to an anti conformation of the OH group, and a change in the NCαCO torsion angle from −178.1 (2)° at 4.8 GPa to −156.3 (10)° at 5.4 GPa. Thus, the same topology appears in both crystal forms, which explains why it occurs from one single-crystal form to another. The transition to L-serine-II is also characterized by the closing-up of voids which occur in the centres of other R-type motifs elsewhere in the structure. There is a marked increase in CH...O hydrogen bonding in both phases relative to L-serine-I at ambient pressure.

Low-temperature specific heat of Ti0.5V0.5 single crystal

1997 ◽  
Vol 237-238 ◽  
pp. 607-608
Author(s):  
K. Tsutsumi ◽  
S. Takayanagi ◽  
T. Hirano
Keyword(s):  
Low Temperature ◽  
Single Crystal ◽  
Specific Heat ◽  
Low Temperature Specific Heat

Ambient pressure synthesis of Eu3+ doped δ-BiB3O6 by seed-assisted high temperature solid state reactions

2020 ◽  
Vol 49 (18) ◽  
pp. 5932-5938
Author(s):  
Yunwei Zhao ◽  
Pengfei Jiang ◽  
Wenliang Gao ◽  
Rihong Cong ◽  
Jing Ju ◽  
...  
Keyword(s):  
Crystal Growth ◽  
High Temperature ◽  
Solid State ◽  
Single Crystal ◽  
Ambient Pressure ◽  
Single Crystal Growth ◽  
Solid State Reactions ◽  
Pressure Synthesis ◽  
High Level

A high level of Eu3+ (7 atom%) was doped successfully, suggesting the possible single crystal growth of bi-functional RE3+-doped δ-BiB3O6.

scholarly journals Critical fields and fluctuations determined from specific heat and magnetoresistance in the same nanogram SmFeAs(O,F) single crystal

2017 ◽  
Vol 96 (10) ◽  
Author(s):  
S. Galeski ◽  
P. W. J. Moll ◽  
N. Zhigadlo ◽  
K. Mattenberger ◽  
B. Batlogg
Keyword(s):  
Single Crystal ◽  
Specific Heat ◽  
Critical Fields
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