Long-range order in the high-temperature phase ofK2ZnCl4

1997 ◽  
Vol 56 (9) ◽  
pp. 5180-5185 ◽  
Author(s):  
F. X. Leduc ◽  
A. Hedoux ◽  
M. Descamps ◽  
F. Danede ◽  
G. Odou
Keyword(s):  
High Temperature ◽  
Long Range ◽  
High Temperature Phase ◽  
Range Order ◽  
Temperature Phase ◽  
Long Range Order

Exact high temperature series expansions for the XY model

1970 ◽  
Vol 48 (13) ◽  
pp. 1566-1577 ◽  
Author(s):  
D. D. Betts ◽  
C. J. Elliott ◽  
M. H. Lee
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Lattice Gas ◽  
Critical Index ◽  
Temperature Series ◽  
Range Order ◽  
Xy Model ◽  
Long Range Order ◽  
Critical Temperatures ◽  
Quantum Lattice Gas

A method is developed for the exact high temperature series expansion of thermodynamic properties of the spin 1/2 XY model of ferromagnetism or of a quantum lattice gas. Eleven coefficients in the specific heat series for the f.c.c. and b.c.c. lattices and nine coefficients in the series for the fluctuation in the long range order for the f.c.c., b.c.c., and s.c. lattices are calculated. From the fluctuation series the critical temperatures Kc−1 ≡ kTc/J are estimated to be 4.520, 2.902, and 2.02 respectively, while the critical index for the square of the fluctuation in the long range order is γ = 1.35.

Measurement of Long Range Order in the γ’ Phase of Nickel-Base Superalloys

1969 ◽  
Vol 13 ◽  
pp. 598-608
Author(s):  
J.R. Mihalisin
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Range Order ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
High Temperature Heat Treatment ◽  
Heat Treated ◽  
Temperature Heat ◽  
Long Time ◽  
Nickel Base

The long range order parameter (S) has been measured at room- temperature on the γ’ phase extracted from IN-731 and alloys 713C and 713LC by x-ray diffraction techniques. Measurements were obtained from specimens of IN-731 and alloy 713LC in the as-cast condition and after long time rupture testing. The alloy 713 c specimens were in the as-cast and high temperature heat treated conditions.It was found that long range order in the γ’ phase of IN-731 and alloy 713LC was changed very little after long time rupture testing, and after high temperature heat treatment in the case of alloy 713C.

Determination of Short Range Order Parameters in 62Ni0.765Fe0.235 At 600°C Effect of a Quench

1982 ◽  
Vol 21 ◽  
Author(s):  
S. Lefebvre ◽  
F. Bley ◽  
P. Cenedese
Keyword(s):  
High Temperature ◽  
Long Range ◽  
Short Range ◽  
Room Temperature ◽  
Short Range Order ◽  
Range Order ◽  
Local Order ◽  
Long Range Order ◽  
Pair Potentials

ABSTRACTDifferent states of local order have been previously measured at room temperature on water quenched crystal of Ni0.76562 Fe0.235 [1−2]. The Cowley' parameters and the interaction pair potentials in a Clapp and floss approximation have been determined at : 385° C, 470°C, 507°C, 535°C, 685°C that is under and above Tc which is equal to 500°C for this composition.The kinetic of long range order establishment is, in this alloy, very sluggish even near Tc [3]; the kinetic of short range order (SRO) is completely different and may be more complex [4]. In the previous experiments it has been supposed that the state of high temperature was retained during the quench. The following experiments check this hypothesis.

Analog to the 4He melting curve in a model geometrically frustrated magnet

2001 ◽  
Vol 79 (11-12) ◽  
pp. 1439-1446 ◽  
Author(s):  
Y K Tsui ◽  
J Snyder ◽  
P Schiffer
Keyword(s):  
Long Range ◽  
Melting Curve ◽  
Range Order ◽  
Gadolinium Gallium Garnet ◽  
Temperature Phase ◽  
Long Range Order ◽  
Static Magnetization ◽  
Weiss Temperature ◽  
Geometrically Frustrated ◽  
Spin Glass Phase

Gadolinium gallium garnet, Gd3Ga5O12 (GGG) has an extraordinary low-temperature phase diagram. Although the Curie–Weiss temperature of GGG is ~–2 K, GGG shows no long-range order down to T ~ 0.4 K. At low temperatures GGG has a spin-glass phase at low fields ([Formula: see text] 0.08 T), a field-induced long-range-ordered anti-ferromagnetic (AFM) phase at fields of between 0.7 and 1.3 T, and, at intermediate fields, an apparent spin-liquid (SL) phase without long-range order. We have performed specific heat, magnetocaloric, and static magnetization measurements near the SL/AFM phase boundary. Our results show that the lower field boundary of the AFM phase has a distinct minimum at T ~ 0.2 K, in analogy to the minimum in the melting curve of 4He. PACS Nos.: 75.30Kz, 75.50Ee

Probing Local and Long-Range Structure Simultaneously:  An In Situ Study of the High-Temperature Phase Transition of α-AlF3

2004 ◽  
Vol 126 (15) ◽  
pp. 4756-4757 ◽  
Author(s):  
Peter J. Chupas ◽  
Santanu Chaudhuri ◽  
Jonathan C. Hanson ◽  
Xiangyun Qiu ◽  
Peter L. Lee ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Temperature ◽  
Long Range ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
In Situ Study ◽  
Temperature Phase Transition
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