Zobrazeno 1 - 10
of 212
pro vyhledávání: '"Christopher J. Howard"'
Autor:
Guangming Lu, Francesco Cordero, Kimura Hideo, Xiangdong Ding, Zhijun Xu, Ruiqing Chu, Christopher J. Howard, Michael A. Carpenter, Ekhard K. H. Salje
Publikováno v:
Physical Review Research, Vol 6, Iss 1, p 013232 (2024)
Precursor elastic effects are investigated in a displacive anharmonic spring model and shown to extend greatly into the paraelastic phase. Weak precursor effects can be detected near 2T_{tr}, where T_{tr} is the ferroelastic transition temperature. T
Externí odkaz:
https://doaj.org/article/d5643ad79ab04652a5ed385161cbf163
Publikováno v:
Science and Technology of Zirconia V ISBN: 9781003421290
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::346d30ee1134a7fbb8ac78f13c156719
https://doi.org/10.1201/9781003421290-7
https://doi.org/10.1201/9781003421290-7
Autor:
Kai Li, Zhi-Gang Li, Jun Xu, Yan Qin, Wei Li, Alessandro Stroppa, Keith T. Butler, Christopher J. Howard, Martin T. Dove, Anthony K. Cheetham, Xian-He Bu
Publikováno v:
Journal of the American Chemical Society. 144:816-823
Hybrid organic-inorganic perovskite (HOIP) ferroelectrics are attracting considerable interest because of their high performance, ease of synthesis, and lightweight. However, the intrinsic thermodynamic origins of their ferroelectric transitions rema
Publikováno v:
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 77:981-985
The room-temperature structure of the filled tetragonal tungsten bronze, Ba2NaNb5O15 (BNN), has been the subject of a number of studies, and these studies have given an almost corresponding number of different results. From a group theoretical examin
Publikováno v:
Journal of Applied Physics. 131:215101
Lattice parameter data from the literature have been used to provide a complete description of spontaneous strain variations across each of the six known phase transitions of [Formula: see text] in the temperature interval 5–1273 K. Analysis of str
Autor:
Xiangdong Ding, Ekhard K. H. Salje, Giulio I. Lampronti, S. L. Driver, Christopher J. Howard, Michael A. Carpenter
Publikováno v:
Physical Review B. 102
A group theoretical model is proposed for linear/quadratic coupling between order parameters which arise from electronic and soft-mode instabilities in doped shape memory alloys, together with coupling to symmetry breaking shear strains. This model i
Autor:
Christopher J. Howard
Publikováno v:
WIT Transactions on The Built Environment.
Autor:
Christopher J. Howard, Siegbert Schmid, Thomas A. Whittle, Shae Machlus, Christopher Yost, Harold T. Stokes, Tyler B. Averett, Branton J. Campbell
Publikováno v:
Acta Crystallographica Section A Foundations and Advances. 74:408-424
Crystalline solids consisting of three-dimensional networks of interconnected rigid units are ubiquitous amongst functional materials. In many cases, application-critical properties are sensitive to rigid-unit rotations at low temperature, high press
Autor:
Christopher J. Howard, Keith T. Butler, Michael A. Carpenter, Aron Walsh, Wenjuan Wei, Wei Li, Guoqiang Feng, Peixiang Lu, Anthony K. Cheetham
Publikováno v:
Wei, W, Butler, K, Feng, G, Howard, C J, Li, W, Carpenter, M, Lu, P, Walsh, A & Cheetham, A K 2018, ' An Unusual Phase Transition Driven by Vibrational Entropy Changes in a Hybrid Organic–Inorganic Perovskite ', Angewandte Chemie-International Edition, vol. 57, no. 29, pp. 8932-8936 . https://doi.org/10.1002/anie.201803176
The driving forces for the phase transitions of ABX3 hybrid organic-inorganic perovskites have been limited to the octahedral tilting, order-disorder, and displacement. Now, a complex structural phase transition has been explored in a HOIP, [CH3 NH3
Publikováno v:
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 74:742-744
The studies of octahedral tilting in the tungsten bronzes [Whittle et al. (2015). Acta Cryst. B71, 342–348] were continued in the context of a more general approach to cooperative rotations of interconnected rigid units [Campbell et al. (2018). Act