Thermomechanical studies on newly developed copolyester thin films. Part I: Thermal expansion coefficients

1998 ◽  
Vol 38 (3) ◽  
pp. 499-504 ◽  
Author(s):  
Frank F. Shi ◽  
James Economy
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients

Organo-Soluble, Segmented Rigid-Rod Polyimides: Synthesis and Properties

1991 ◽  
Vol 227 ◽  
Author(s):  
F. W. Harris ◽  
S. L. C. Hsu ◽  
C. J. Lee ◽  
B. S. Lee ◽  
F. Arnold ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Glass Transition ◽  
Oxidative Stability ◽  
Organic Solvents ◽  
Dielectric Constants ◽  
Glass Transition Temperatures ◽  
Thermal Expansion Coefficients ◽  
Rigid Rod ◽  
Expansion Coefficients

ABSTRACTSeveral segmented, rigid-rod polyimides have been prepared that are soluble in organic solvents in their fully imidized form. The polymers were prepared from commercial dianhydrides and 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (TFMB). Their intrinsic viscosities ranged from 1.0 to 4.9 dL/g. Tough, colorless films could be cast from m-cresol solutions at 100°C. The polymers had glass transition temperatures (Tgs) above 275°C and displayed outstanding thermal and thermo-oxidative stability. Fibers were prepared from the 3,3′,4,4′-tetracarboxybiphenyl dianhydride (BPDA) based polymers that had moduli of 130 GPa and tensile strengths of 3.2 GPa. The thermal expansion coefficients and dielectric constants of thin films (20–25 μm) of the polymers were as low as −2.40×10−6 and 2.5, respectively.

Thermal expansion of the new perovskite substrates DyScO3 and GdScO3

2005 ◽  
Vol 20 (4) ◽  
pp. 952-958 ◽  
Author(s):  
M.D. Biegalski ◽  
J.H. Haeni ◽  
S. Trolier-McKinstry ◽  
D.G. Schlom ◽  
C.D. Brandle ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Rare Earth ◽  
Lattice Spacing ◽  
Epitaxial Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Increasing Temperature

The thermal expansion coefficients of DyScO3 and GdScO3 were determined from298 to 1273 K using x-ray diffraction. The average thermal expansion coefficients of DyScO3 and GdScO3 were 8.4 and 10.9 ppm/K, respectively. No phase transitions were detected over this range, though the orthorhombicity decreased with increasing temperature. These thermal expansion coefficients are similar to other oxide perovskites (e.g., BaTiO3 or SrTiO3), making these rare-earth scandates promising substrates for the growth of epitaxial thin films of many oxide perovskites that have similar lattice spacing and thermal expansion coefficients.

Thermal Expansion Coefficients of Obliquely Deposited MgF2 Thin Films

2010 ◽  
Author(s):  
Cheng-Chung Jaing ◽  
Ming-Chung Liu ◽  
Cheng-Chung Lee ◽  
Bo-Huei Liao ◽  
Chien-Jen Tang
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients

The Band-Structure Parameters of Bi1 –xSbx (0 ≤ x ≤ 0.15) Thin Films on Substrates with Different Thermal-Expansion Coefficients

2019 ◽  
Vol 53 (5) ◽  
pp. 611-614 ◽  
Author(s):  
A.V. Suslov ◽  
V. M. Grabov ◽  
V. A. Komarov ◽  
E. V. Demidov ◽  
S. V. Senkevich ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Expansion ◽  
Band Structure ◽  
Structure Parameters ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients
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