TY - JOUR T1 - The PTCR effect of donor-doped barium titanate: Origin of the surface states at the grain-boundary JO - Ceramic Transactions PY - 2006/01/01 AU - Li B AU - Zhou D AU - Huang H AU - West AR ED - VL - 174 SP - 131 EP - 138 Y2 - 2025/04/17 ER -