Thermal and physical properties of reconsolidated crushed rock salt as a function of porosity and temperature

2015 ◽  
Vol 11 (4) ◽  
pp. 913-924 ◽  
Author(s):  
Stephen Bauer ◽  
Alexander Urquhart
2020 ◽  
pp. 627-632
Author(s):  
U. Heemann ◽  
S. Heusermann ◽  
W. Sarfeld ◽  
B. Faust

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 20679-20686
Author(s):  
Jasmin Simons ◽  
Jan Hempelmann ◽  
Kai S. Fries ◽  
Peter C. Müller ◽  
Richard Dronskowski ◽  
...  

Future technologies are in need of solid-state materials showing the desired chemical and physical properties, and designing such materials requires a proper understanding of their electronic structures.


Author(s):  
Vladlen V. Zhukov ◽  
Denis A. Shcherbakov ◽  
Pavel B. Sorokin ◽  
Boris P. Sorokin

In this work the physical properties of the piezoelectric aluminum-scandium nitride (ASN) solid solution as a function of scandium concentration were studied using the density functional theory and experimental methods. The phase transition from the wurtzite phase to the rock salt phase at a Sc concentration of 43% was shown. The barriers of transformation from the wurtzite phase to the rock salt phase for various Sc concentrations were obtained. The behavior of the ASN piezoelectric constant d33 calculated by the piezoelectric constants e33, e31, and e15 shows a sharp increase with increasing Sc concentration compared to aluminum nitride AlN. The relationship between the increase in the piezoelectric response of ASN and the softening of the lattice, accompanied by a decrease in the main elastic constants C11, C33, C44 and C66, as well as a decrease in the c/a ratio with increasing Sc concentration, is shown. ASN films with a predominance of the crystal orientation (00·2) were obtained experimentally by magnetron sputtering. The structural properties of the films were studied by X-ray diffraction analysis. A comparison of the experimentally obtained dependence of the c/a ratio on the Sc concentration with the theoretical values showed a good correspondence. Studies of the physical properties of ASN thin films were performed using microwave multi-overtone composite resonators on diamond substrates with a longitudinal bulk acoustic wave (BAW) as the operating mode in the range of 0.5 – 20 GHz. The frequency dependences of the Q-factor of BAW-resonators with different ASN films were obtained, and the frequency dependences of the square of the modulus of the form factor as |m|2 were calculated. The dependences of the elastic constant С33 and the piezoelectric constant e33 for the ASN films with different Sc concentrations were calculated. The calculated and measured values of these constants are agreed within the experimental error.


2014 ◽  
Vol 104 (3) ◽  
pp. 607-620
Author(s):  
Lukas M. Keller ◽  
Michael Jobmann ◽  
Philipp Schuetz ◽  
Philippe Gasser
Keyword(s):  

1981 ◽  
Author(s):  
L H Gevantman ◽  
J Lorenz ◽  
J L, Jr Haas ◽  
M A Clynne ◽  
R W, II Potter ◽  
...  

1976 ◽  
Vol 32 ◽  
pp. 365-377 ◽  
Author(s):  
B. Hauck
Keyword(s):  

The Ap stars are numerous - the photometric systems tool It would be very tedious to review in detail all that which is in the literature concerning the photometry of the Ap stars. In my opinion it is necessary to examine the problem of the photometric properties of the Ap stars by considering first of all the possibility of deriving some physical properties for the Ap stars, or of detecting new ones. My talk today is prepared in this spirit. The classification by means of photoelectric photometric systems is at the present time very well established for many systems, such as UBV, uvbyβ, Vilnius, Geneva and DDO systems. Details and methods of classification can be found in Golay (1974) or in the proceedings of the Albany Colloquium edited by Philip and Hayes (1975).


Author(s):  
Frederick A. Murphy ◽  
Alyne K. Harrison ◽  
Sylvia G. Whitfield

The bullet-shaped viruses are currently classified together on the basis of similarities in virion morphology and physical properties. Biologically and ecologically the member viruses are extremely diverse. In searching for further bases for making comparisons of these agents, the nature of host cell infection, both in vivo and in cultured cells, has been explored by thin-section electron microscopy.


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