Low-temperature phase transitions in the rare-earth ferroborate Nd0.75Dy0.25Fe3(BO3)4

2010 ◽  
Vol 36 (3) ◽  
pp. 279-281 ◽  
Author(s):  
G. A. Zvyagina ◽  
K. R. Zhekov ◽  
I. V. Bilych ◽  
A. A. Zvyagin ◽  
L. N. Bezmaternyhk ◽  
...  
Keyword(s):  
Rare Earth ◽  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Low Temperature Phase ◽  
The Rare Earth

scholarly journals LOW TEMPERATURE PHASE OF THE RARE-EARTH-FREE MnBi MAGNETIC MATERIAL

2018 ◽  
Vol 54 (1A) ◽  
pp. 50
Author(s):  
Nguyen Van Vuong
Keyword(s):  
Magnetic Material ◽  
Phase Diagram ◽  
Rare Earth ◽  
Low Temperature ◽  
Temperature Gradient ◽  
Diffusion Mechanism ◽  
Time Dependent ◽  
Temperature Phase ◽  
Low Temperature Phase ◽  
The Rare Earth

The Low Temperature Phase (LTP) content determines the spontaneous magnetization Ms of the rare-earth-free hard magnetic material MnBi. LTP in MnBi samples alloyed by the arc-melting is timely developed when they are annealed at the annealing temperatures Ta < 340 oC. Because of the complexity of the phase diagram of MnxBi(100-x) system, the content hardly reaches the value of 100 wt%. Based on the phase diagram of MnxBi(100-x) system, the upper limit * was calculated and 59.8 wt% is the highest content which can be reached when the alloy is isothermally annealed for a long time. The time-dependent behavior of (t) reveals that the LTP is formed from Mn and Bi phases by the diffusion mechanism. The time-dependent diffusion equation has been used to investigate the diffusion process between Mn and Bi in order to form the LTP. The comparison between the theoretical and experimental data allowed to estimate the mutual diffusion coefficient D 510-12 cm2/s. This small value of D is suggested due to not only the low value of Ta necessary for forming LTP but the high surface tension of Bi melted at Ta as well. The calculated results showed that the size distribution of Mn grains embedded in the Bi matrix affected the dependence (t), enhancing and inhibiting in the samples annealed for short and long times, respectively. To increase over *, the anneal at Ta superimposed by the small temperature gradient of 2 oC/cm has been performed. This temperature-gradient driven annealing technique helped to overcome * and reach the value of 83 wt% which corresponds to the Ms = 60 emu/g measured at the field strength of 4 Tesla.

X-ray study of the low-temperature phase transitions in LiKSO4

1983 ◽  
Vol 4 (1) ◽  
pp. 37-45 ◽  
Author(s):  
P. E. Tomaszewski ◽  
K. Łukaszewicz
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
X Ray ◽  
Low Temperature Phase

SHG Microscopic Studies on Low Temperature Phase Transitions of SrTi 16 O 3 and SrTi 18 O 3

2003 ◽  
Vol 285 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Yoshiaki Uesu ◽  
Ryuhei Nakai ◽  
Noritaka Kato ◽  
Carole Menoret ◽  
Jean-Michel Kiat ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Microscopic Studies ◽  
Low Temperature Phase

Low-temperature phase transitions and dynamics of ammonium in (NH4)3H(SO4)2 and [(NH4)1−x Rbx]3H(SO4)2 crystals

2001 ◽  
Vol 43 (1) ◽  
pp. 117-126 ◽  
Author(s):  
L. S. Smirnov ◽  
A. I. Baranov ◽  
L. A. Shuvalov ◽  
L. Bobrowicz-Sarga ◽  
I. Natkaniec ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Low Temperature Phase

Raman study of low temperature phase transitions in the cubic perovskite CH3NH3PbCI3

1998 ◽  
Vol 64 (4) ◽  
pp. 179-190 ◽  
Author(s):  
A. Maaej ◽  
M. Bahri ◽  
Y. Abid ◽  
N. Jaidane ◽  
Z. B. Lakhdar ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Raman Study ◽  
Low Temperature Phase

Single-Crystal X-Ray Scattering Study of Superstructures and Phase Transitions in Graphite-Hno3 and Graphite-Br2 Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
R. Moret ◽  
R. Comes ◽  
G. Furdin ◽  
H. Fuzellier ◽  
F. Rousseaux
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Temperature Phase ◽  
Temperature Structure ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Temperature Liquid ◽  
Low Temperature Phase

ABSTRACTIn α-C5n-HNO3 the condensation of the room-temperature liquid-like diffuse ring associated with the disorder-order transition around 250 K is studied and the low-temperature. superstructure is examined.It is found that β-C8n-HNO3 exhibits an in-plane incommensurate order at room temperature.Two types of graphite-Br2 are found. Low-temperature phase transitions in C8Br are observed at T1 ≍ 277 K and T2 ≍ 297 K. The room-temperature structure of C14Br is reexamined. Special attention is given to diffuse scattering and incommensurability.

Electric and Magnetic Low-Temperature Phase Transitions ofYbMn2O5

1996 ◽  
Vol 65 (5) ◽  
pp. 1383-1386 ◽  
Author(s):  
Yasuharu Koyata ◽  
Hideki Nakamura ◽  
Nobuyuki Iwata ◽  
Akihiro Inomata ◽  
Kay Kohn
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Low Temperature Phase
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