Negotiations in Vienna aimed at reviving the Iran nuclear deal are to be suspended Friday so that European diplomats can review proposals by the Islamic republic, state media said.

The talks would "most likely" resume on Monday but the negotiating teams would need to remain in the Austrian capital to continue their work, the semi-official ISNA news agency said.

"This meeting was requested by the European side before its representatives return to their capitals to review the text proposed by Iran," the news agency added.

  Two diplomatic sources based in Vienna confirmed the report to AFP.

  A resumption is expected early next week, one European diplomat said.

On Thursday, Iran's lead negotiator Ali Bagheri said the proposals concerned two main issues facing the 2015 accord known as the Joint Comprehensive Plan of Action, or JCPOA.

"The first document sums up the Islamic republic's point of view concerning the lifting of sanctions, while the second is about Iran's nuclear actions," Bagheri told state television.

In a telephone call with EU top diplomat Josep Borrell, Foreign Minister Hossein Amir-Abdollahian said the talks were going well "but slowly on all tracks".

"We think that a good agreement is possible but that requires a change of approach by certain parties who must drop their threatening language and opt for texts focused on cooperation, mutual respect and results," the minister said.

The talks had resumed in the Austrian capital on Monday after Iran paused them in June following the election of ultraconservative President Ebrahim Raisi.

The goal of the JCPOA is to make it practically impossible for Iran to build an atomic bomb, while allowing it to pursue a civilian nuclear programme. Iran has always denied wanting a nuclear arsenal.