| B. Naranjo, J.K. Gimzewski, S. Putterman (UCLA) | 2005 | Nature 434, 1115-1117; DOI 10.1038/nature03575 | Tabletop chamber: a lithium tantalate crystal with a tungsten tip of nanometer-scale radius on its charged face, facing a grounded counter-electrode; deuterium gas in the gap serves as the ionizable medium | LiTaO3 monocrystal (pyroelectric coefficient of order 10 nC/cm2/K), tungsten tip, deuterium gas | Gas-phase D2 near the tip; no metal hydride phase | Thermal cycling of the crystal (heating so that the pyroelectric surface charge builds until field emission and gas ionization turn on) | Low-pressure D2 atmosphere, room-temperature-adjacent vacuum chamber, single-crystal geometry | Detection of 2.45 MeV neutrons and 3 MeV protons from D-D fusion; deuteron energies of order 100 keV class from the crystal potential; the authors state the system will find application as a simple palm-sized neutron generator |
| J.D. Brownridge, S. Raboy (Binghamton University) | 2001 | arXiv:physics/0107046 (no journal DOI found; arXiv record confirmed) | Measurement of the pyroelectric response and the electric potential generated by heated and cooled ferroelectric crystals in dilute gas, showing electron acceleration and X-ray production from the crystal field | LiNbO3 and LiTaO3 crystals | None (electron source) | Heating and cooling cycles | Dilute gas, moderate vacuum | Large electric fields and electron acceleration to energies sufficient for X-ray production; establishes the potential magnitudes available from a single crystal |
| J.D. Brownridge, S.M. Shafroth | 2004 | Review manuscript, "Electron and positive ion beams and X-rays produced by heated and cooled pyroelectric crystals such as LiNbO3 and LiTaO3 in dilute gases: phenomenology and applications" (freely accessible copy confirmed; no journal DOI found) | Comprehensive phenomenology of pyroelectric electron/ion acceleration across many thermal cycles and crystal geometries | LiNbO3, LiTaO3 | Dilute gas media | Thermal cycling | Dilute gases | Reproducible electron and positive-ion beams and X-rays from crystal fields; documents energy scaling with crystal size and cycle rate |
| J.A. Geuther, Y. Danon (Rensselaer Polytechnic Institute) | 2005 | Journal of Applied Physics 97, 074109 (venue and year confirmed; DOI not independently confirmed) | Pyroelectric crystal accelerator with paired crystals and tungsten emitter; electron and positive-ion acceleration measured directly | LiTaO3 crystals, tungsten tip | Dilute gas | Thermal cycling | Vacuum with dilute gas | Electron and positive-ion acceleration with pyroelectric crystals; potential doubling with paired crystals |
| J.A. Geuther, Y. Danon, F. Saglime (Rensselaer Polytechnic Institute) | 2006 | Physical Review Letters 96, 054803 (venue, year and title confirmed via PubMed record PMID 16486940) | Pyroelectric accelerator driving D-D fusion independently of the UCLA device; crystal-field acceleration of deuterons onto a deuterated target | LiTaO3 crystal, deuterated target material | Deuterated target | Thermal cycling of the crystal | Vacuum chamber | Detection of 2.5 MeV neutrons; measured neutron yield reported in good agreement with the calculated yield; the authors state this verifies the results published by Naranjo, Gimzewski and Putterman |
| J.A. Geuther, Y. Danon | 2007 | Applied Physics Letters 90, 174103 (venue, year and title confirmed via AIP record) | Pyroelectric fusion device with an optimized crystal-tip-target geometry | LiTaO3 crystals, tungsten tip, deuterated target | Deuterated target | Thermal cycling | Vacuum chamber | Neutron production increased by a factor of 5.6 over previously published data (as stated in the AIP abstract) |
| V. Tang, G. Meyer, J. Morse, G. Schmid, C. Spadaccini, P. Kerr, B. Rusnak, S. Sampayan, B. Naranjo, S. Putterman (Lawrence Livermore and UCLA) | 2008 | Review of Scientific Instruments 79, 013501 class (venue: Review of Scientific Instruments, year confirmed via PubMed record PMID 18163729) | Feedback-controlled thermal cycling of a pyroelectric crystal stack for steady neutron production | LiTaO3 crystal stack, tungsten tips | Gas-phase deuterium | Closed-loop thermal cycling | Vacuum chamber | Neutron production controlled and sustained through feedback-controlled thermal cycling of a crystal stack |
| LiTaO3 pyroelectric accelerator study (authors from the quasi-continuous X-ray source record) | 2025 | Scientific Reports 15; DOI 10.1038/s41598-025-15436-4 | LiTaO3-based pyroelectric accelerator driven by a periodically varying temperature for quasi-continuous X-ray generation | LiTaO3 single crystal | Moderate vacuum, below 10^-2 Torr | Periodic temperature variation | Moderate vacuum (< 10^-2 Torr) | Strong electric fields and quasi-continuous X-ray generation under periodically varying temperature; shows the concept runs continuously rather than once per cycle |
| US Patent 8,396,181 B2, inventors B. Naranjo, J. Gimzewski, S. Putterman, assignee Regents of the University of California | Filed 2007, issued 2013 | US 8,396,181 B2 (USPTO record confirmed) | Method and apparatus for generating nuclear fusion using crystalline materials | Pyroelectric crystals, tips | Gas-phase deuterium | Thermal cycling | Vacuum | Formal apparatus and method claims for crystal-driven fusion neutron sources |
