scholarly journals Negative thermal expansion and anomalies of heat capacity of LuB50 at low temperatures

2015 ◽  
Vol 44 (36) ◽  
pp. 15865-15871 ◽  
Author(s):  
V. V. Novikov ◽  
N. A. Zhemoedov ◽  
A. V. Matovnikov ◽  
N. V. Mitroshenkov ◽  
S. V. Kuznetsov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Low Temperatures ◽  
Negative Thermal Expansion ◽  
Temperature Range

Heat capacity and thermal expansion of LuB50 boride were experimentally studied in the 2–300 K temperature range.

Enlarging the Temperature Range for Maximum Wear Resistance of TiNi Alloy Using a NTE Phase

2007 ◽  
Vol 539-543 ◽  
pp. 3261-3266 ◽  
Author(s):  
Iulian Radu ◽  
Dong Yang Li
Keyword(s):  
Wear Resistance ◽  
Thermal Expansion ◽  
Internal Stress ◽  
Frictional Heating ◽  
Negative Thermal Expansion ◽  
High Wear Resistance ◽  
Tini Alloy ◽  
Wear Loss ◽  
Second Phase ◽  
Temperature Range

The near-equiatomic TiNi alloy has been demonstrated to possess high wear resistance, which largely benefits from its pseudoelasticity (PE). However, the PE occurs only in a small temperature range, which makes the wear resistance of this alloy unstable as temperature changes, caused by environmental instability or frictional heating. Therefore, enlarging the working temperature of PE could considerably improve this alloy as a novel wear-resistant material. One possible approach is to develop a self-built temperature-dependent internal stress field by taking the advance of the difference in thermal expansion between the pseudoelastic matrix and a reinforcing phase. Such a T-dependent internal stress could adjust the martensitic transformation temperature to respond changes in environmental temperature so that the temperature range of PE could be enlarged, thus leading to a wide temperature range in which the minimum wear loss is retained. Research was conducted to investigate effects of an added second phase having a negative thermal expansion (NTE) coefficient on the wear resistance of a near-equiatomic TiNi alloy. It was demonstrated that the temperature range of this modified material in which the wear loss dropped was enlarged. In addition, the wear resistance of such a TiNi-matrix composite was on one order of magnitude higher than that of unmodified TiNi alloy.

Microstructural effects on negative thermal expansion extending over a wide temperature range in β-Cu1.8Zn0.2V2O7

2018 ◽  
Vol 113 (18) ◽  
pp. 181902 ◽  
Author(s):  
N. Katayama ◽  
K. Otsuka ◽  
M. Mitamura ◽  
Y. Yokoyama ◽  
Y. Okamoto ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Wide Temperature Range ◽  
Negative Thermal Expansion ◽  
Temperature Range ◽  
Microstructural Effects

scholarly journals Thermal Properties of Stabilized Zirconia at Low Temperatures

1985 ◽  
Vol 38 (4) ◽  
pp. 617 ◽  
Author(s):  
JG Collins ◽  
SJ Collocott ◽  
GK White
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Low Temperatures ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Stabilized Zirconia ◽  
Elastic Data

The linear thermal expansion coefficient a from 2 to 100 K and heat capacity per gram cp from 0�3 to 30 K are reported for fully-stabilized zirconia containing a nominal 16 wt.% (9 mol.%) of yttria. The heat capacity below 7 K has been analysed into a linear (tunnelling?) term, a Schottky term centred at 1�2 K, a Debye term (e~ = 540 K), and a small T5 contribution. The expansion coefficient is roughly proportional to T from 5 to 20 K and gives a limiting lattice Griineisen parameter 'Yo ::::: 5, which agrees with that calculated from elastic data.

scholarly journals Negative Thermal Expansion over a Wide Temperature Range in Fe-Doped MnNiGe Composites

2018 ◽  
Vol 6 ◽  
Author(s):  
Wenjun Zhao ◽  
Ying Sun ◽  
Yufei Liu ◽  
Kewen Shi ◽  
Huiqing Lu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Wide Temperature Range ◽  
Negative Thermal Expansion ◽  
Temperature Range

Negative Thermal Expansion of Yb2Mo3O12 and Lu2Mo3O12

2008 ◽  
Vol 368-372 ◽  
pp. 1662-1664 ◽  
Author(s):  
X.L. Xiao ◽  
M.M. Wu ◽  
J. Peng ◽  
Y.Z. Cheng ◽  
Zhong Bo Hu
Keyword(s):  
Thermal Expansion ◽  
Solid State ◽  
Solid State Reaction ◽  
Linear Thermal Expansion ◽  
Negative Thermal Expansion ◽  
Orthorhombic Structure ◽  
Conventional Solid State Reaction ◽  
Temperature Range ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients

Compounds Yb2Mo3O12 and Lu2Mo3O12 were prepared by conventional solid-state reaction. Their crystal structures and thermal expansion properties were investigated. It was found that Yb2Mo3O12 and Lu2Mo3O12 adopt orthorhombic structure and show negative thermal expansion (NTE) in the temperature range of 200-800 °C. Their a-axis and c-axis exhibit stronger contraction in the temperature range of 200-800 °C, while b-axis slightly expands in the temperature range of 200-300 °C and then contracts in the temperature range of 300-800 °C. The linear thermal expansion coefficients al of Yb2Mo3O12 and Lu2Mo3O12 are −5.17 × 10−6 °C−1 and −5.67 × 10−6 °C−1, respectively.

The tunable negative thermal expansion covering a wide temperature range around room temperature in Sn, Mn co-substituted Mn3ZnN

2020 ◽  
Vol 49 (30) ◽  
pp. 10407-10412
Author(s):  
Shugang Tan ◽  
Chenhao Gao ◽  
Cao Wang ◽  
Tong Zhou ◽  
Guangchao Yin ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Wide Temperature Range ◽  
Room Temperature ◽  
Negative Thermal Expansion ◽  
Temperature Range

Based on anti-perovskite Mn3ZnN, the negative thermal expansion (NTE) temperature can be effectively broadened via co-substituting Sn, Mn.

Negative thermal expansion in a zirconium tungstate/epoxy composite at low temperatures

2013 ◽  
Vol 49 (1) ◽  
pp. 392-396 ◽  
Author(s):  
Lauren A. Neely ◽  
Vladimir Kochergin ◽  
Erich M. See ◽  
Hans D. Robinson
Keyword(s):  
Thermal Expansion ◽  
Low Temperatures ◽  
Epoxy Composite ◽  
Negative Thermal Expansion ◽  
Zirconium Tungstate

Negative Thermal Expansion in Mn3Ga(Ge,Si)N Anti-Perovskite Materials

2007 ◽  
Vol 561-565 ◽  
pp. 557-562 ◽  
Author(s):  
Ying Sun ◽  
Cong Wang ◽  
Yong Chun Wen
Keyword(s):  
Heat Capacity ◽  
Thermal Expansion ◽  
Transport Properties ◽  
Electronic Transport ◽  
Perovskite Structure ◽  
Magnetic Transition ◽  
Negative Thermal Expansion ◽  
Electronic Transport Properties ◽  
Perovskite Materials ◽  
Expansion Behavior

Mn3GaN has anti-perovskite structure and there exists an abnormal thermal expansion behavior in accompanying with a magnetic transition and variation of electronic transport properties. Substitution of Ga by Ge(Si) induces the change of the thermal expansion properties and the corresponding temperature range. The structure, heat capacity, magnetic and electronic transport properties of Mn3Ga(Ge,Si)N were investigated and discussed.

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