Dielectric Properties of PbNb₂O₆ up to 700°C from Impedance Spectroscopy

Table 1

Comparison of recently reported Curie temperatures of orthorhombic PbNb₂O₆ samples.

Sample	Sintering		Curie temperature 𝑇(Curie) in °C
	Temp. (°C)	Time (h)
Present	1270	4.5	𝑇(Curie)>576 for 4.0 MHz, and >574 for 0.5 kHz.
[17]	1270	4.5	517
[18]	1270	—	534 and 540 (both at 10 kHz)
[19]	—	—	540 (presumably at 80 kHz)
[20]	1240–1260	4	530 (at 10 kHz)
[13]	1270	4.5	531 (at 1 kHz), 528 (at 1 MHz) and 533 (at 10 MHz)