Dear community, We are pleased to announce that the abstract submission deadline for AsCA (Asian Crystallographic Association) 2025 has been *extended to August 15, 2025*. You are warmly invited to submit abstracts to sessions related to crystallography, mineralogy, phase transitions, physical properties, and a broad array of experimental and computational techniques. For full details, please visit: https://asca2025.org/page/12 [image: image.png] This invitation particularly highlights the following microsymposia: - *MS2-4*: *Minerals and inorganic materials* - *MS2-5*: *Polymorphism, co-crystals, and solid-state phase transitions* - *MS3-2*: *Phase transition: from static to dynamic phenomena of quantum materials* - *MS3-3:* *Electronic structures as seen by X-ray and electron diffraction* - *MS3-4: * *Special measurement technique: extreme condition, time-resolved, in-situ measurement* - *MS4-2*: *Materials from the solar system and beyond* - *MS4-5*:* Interdisciplinary approach for disorder and short-range order in materials* - *MS5-1*: *X-ray free electron lasers: techniques and applications* - *MS5-2*: *Quantum crystallography covering experimental and computational works* - *MS5-4*: *Advances in synchrotron and neutron sciences* These sessions span a wide range of cutting-edge topics in crystallography and materials science, with particular relevance to the mineralogical and geoscience communities. We welcome contributions involving the crystallography and spectroscopy of minerals and inorganic materials, solid-state phase transitions, and structural evolution under extreme conditions. Several sessions highlight experimental breakthroughs using synchrotron, neutron, and X-ray free electron laser techniques, as well as emerging computational and quantum crystallographic approaches. Topics include vibrational and electronic properties, disorder and short-range order, planetary materials, and dynamic structural phenomena across scales and environments. AsCA 2025 will take place in Taipei, Taiwan, from December 1 to 5, 2025. The abstract submission deadline is *1 August 2025*. Link to the submission portal: https://asca2025.org/page/15 We look forward to your contributions and hope to see you in Taipei. Best regards, *Jennifer Kung* On behalf of the Host Organization -- Jennifer Kung (龔慧貞) Department of Earth Sciences National Cheng Kung University 1 University Road, Tainan 70101 Taiwan E-mail: jkung@mail.ncku.edu.tw Tel: 886-6-2757575 X 65434 Fax:886-6-2740285