Patent SG-11201906684Q-A (SG)
Title: Methods of identifying a ceramic material exhibiting an electric field induced strain derived from a reversible phase transition, methods of preparation and ceramic materials obtainable therefrom
Inventor: CANN DAVID
IPC: C04B35/468
Filed: 2018-02-02
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 09 August 2018 (09.08.2018) WIPO I PCT omit VIII °nolo VIII ill OH VIII n mom oimIE (10) International Publication Number WO 2018/142151 Al (51) International Patent Classification: CO4B 35/475 (2006.01) CO4B 35/465 (2006.01) HOlL 41/187 (2006.01) CO4B 35/468 (2006.01) CO4B 35/462 (2006.01) (21) International Application Number: PCT/GB2018/050306 (22) International Filing Date: 02 February 2018 (02.02.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 1701830.0 03 February 2017 (03.02.2017) GB (71) Applicant (for all designated States except US): XAAR TECHNOLOGY LIMITED [GB/GB]; Science Park, Cambridge Cambridgeshire CB4 OXR (GB). (72) Inventors; and (71) Applicants (for US only): CANN, David [US/US]; C/o Oregon State University, Corvallis, Oregon 97331 (US). GIBBONS, Brady [US/US]; C/o Oregon State University, Corvallis, Oregon 97331 (US). MARDILOVICH, Peter [US/GB]; C/o XAAR Technology Limited, Science Park, Cambridge Cambridgeshire CB4 OXR (GB). (74) Agent: STOTT, Michael et al.; Mathys and Squire LLP, The Shard, 32 London Bridge Street, London SE1 9SG (GB). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3)) = (54) Title: METHODS OF IDENTIFYING A CERAMIC MATERIAL EXHIBITING AN ELECTRIC FIELD INDUCED STRAIN DERIVED FROM A REVERSIBLE PHASE TRANSITION, METHODS OF PREPARATION AND CERAMIC MATERIALS OB- TAINABLE THEREFROM (57) : The present invention relates to a method for identifying a solid solution ceramic material of a plurality of perovskite compounds which exhibits an electric field induced strain derived from a reversible phase transition, as well as a method for making such ceramic materials and ceramic materials obtainable therefrom. In particular, the present invention is directed to a method of identifying a solid solution ceramic material of at least three perovskite compounds which exhibits an electric field induced strain derived from a reversible phase transition; said method comprising the steps of: i) determining a molar ratio of at least one tetragonal perovskite compound to at least one non-tetragonal perovskite compound which, when combined to form a solid solution, provides a ceramic material comprising a major portion of a tetragonal phase having an axial ratio c/a of greater than 1.005 to 1.04; and ii) determining a molar ratio of at least one additional non-tetragonal perovskite compound to the combination of perovskite compounds from step i) at the determined molar ratio which, when combined to form a solid solution, provides a ceramic material comprising a major portion of a pseudo-cubic phase having an axial ratio c/a of from 0.995 to 1.005 and/or a rhombohedral angle of 90 ± 0.5 degrees.